Browsing by Author "Juárez, Juliana María"

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Aniline alkylation with methanol: relationship nature and strength of active sites - catalytic activity
(Materials Chemistry, 2019) Juárez, Juliana María; Anunziata, Oscar Alfredo
The products of the alkylation of aniline (A) with methanol (M), both carbon alkylate and N-derivatives are important intermediaries in the organic synthesis. Thus, toluidine (To), N-methylaniline (NMA) and N-dimethylaniline (NNDMA), the main products of this reaction are used as intermediates in the manufacture of dyes, plastics and explosives. The preparation of these products in liquid phase has been widely studied. Naturally, this process in the presence of strong acids generates problems of corrosion and contaminating residues. A comparative analysis between all the reaction products obtained indicates that NMA is the initial product of aniline alkylation with methanol with the highest formation rate. The NNDMA would come from the alkylation of the NMA following a relatively similar behavior. NNDMT follows a particular behavior. It is always secondarily unstable except in SBS-SLS (Strong Bonsted - Strong Lewis site pairs), where it is stable at high conversion levels. To is always an unstable secondary product, except for the SBS-SBS (stable) group, with a maximum formation rate in SBS-SLS between 15-20% of aniline conversion and more than 20% in the neighboring SBS-SBS.
Direct synthesis of ordered mesoporous carbon applied in hydrogen storage
(Springer Science+Business Media, 2018) Juárez, Juliana María; Gómez Costa , Marcos Bruno; Anunziata, Oscar Alfredo
In this work, we present a direct, novel and low cost method for the preparation of an ordered mesoporous carbon (OMC). OMC was successfully synthesized by the carbonization of the silica/triblock copolymer/sucrose composite in the presence of sulfuric acid. The resulting material was characterized by XRD, N2 sorption analysis and TEM techniques. The novel synthesis technique improved significantly the H2 storage properties (3.78 wt%) compared with that of CMK-3 synthesized using the nanocasting strategy (2.2 wt%) at 77 K and 10 bar.
Drug delivery system: large pore SBA-15 as host for ketorolac tromethamine
(2022) Juárez, Juliana María; Cussa, Jorgelina; Anunziata, Oscar Alfredo; Gómez Costa, Marcos Bruno
Drug-controlled release systems can keep the level of drugs in precise doses in the body above the optimal level and with low toxicity. We propose the LP-SBA-15 nanomaterial as a promising new host for drug delivery systems because of its high biocompatibility, in vivo biodegradability, and low toxicity. Ketorolac-LP-SBA-15 was prepared and characterized by XRD, FTIR, UV-Vis DRS, TEM, and texture analysis, determining the adsorption capacity and its release, achieving the required therapeutic efficacy. The host shows ordered mesoporous nanochannels with a diameter of 11-12 nm, maintaining the structure with the incorporation of Keto. The mechanism of drug release the LP-SBA-15 host was evaluated. Different mathematical models were used to adjust the experimental data, being the Ritger-Peppas model followed by the Weibull model the best ones. In this work, we show a promising drug storage material for effective encapsulation and controlled release of KETO, achieving the required therapeutic efficacy. Studies indicate that KETO was adsorbed on the channel surface of LP-SBA-15 without affecting the structure or chemical composition of KETO. Controlled drug delivery systems can achieve precise delivery at the time and place of destination, keeping the concentration of the drug at points in the body within the optimal range and below the toxicity threshold. The study also demonstrates the storage capacity and release properties of LPSBA-15 containing KETO. The release of KETO contained in LP-SBA-15 can offer a significant improvement in the controlled release of the drug and the analgesic and anti-inflammatory effects, positively influenced, by the links formed between the host and drug molecules and by diffusion through the host porosity. The promising results we obtained for the release of the drug thoroughly using the new material, reaching a rapid initial release rate, and maintaining a constant rate afterward, allow us to maintain the concentration of the drug in the therapeutic efficacy range, applying it largely to the treatment of diseases that require a rapid response.
Drug release system. Nanostructured Ketorolactromethamine/MCF composite
(CICAT, 2018) Cussa , Jorgelina; Juárez, Juliana María; Prados, Antonela M.; Gómez Costa , Marcos Bruno; Anunziata, Oscar Alfredo
Los sistemas controlados de administración de fármacos mantienen la concentración de medicamentos en los lugares específicos del cuerpo, mejorando la eficacia terapéutica y reduciendo la toxicidad. El material de espuma celular mesoestructurada (MCF) es un nuevo y prometedor huésped para los sistemas de administración de fármacos debido a su alta biocompatibilidad, biodegradabilidad in vivo y baja toxicidad. El composite Ketorolaco-Tromethamine/MCF fue sintetizado. La síntesis de material y la carga de ketorolacotrometamina en los poros de MCF fueron exitosas, demostrándose mediante XRD, FTIR, TGA, TEM y análisis de textura. Obtuvimos resultados prometedores para la liberación controlada de fármacos utilizando el nuevo material MCF. La aplicación de estos materiales en la liberación de KETO es innovadora, logrando una alta velocidad inicial y luego manteniendo una velocidad constante en tiempos altos. Esto permite mantener la concentración del fármaco dentro del rango de eficacia terapéutica, siendo altamente aplicable para el tratamiento de enfermedades que necesitan una respuesta rápida. La liberación de KETO/MCF se comparó con otro soporte de KETO (KETO / SBA-15) y tabletas comerciales.
Drug release system: Chlorambucil loaded in mesoporous cellular foam (MCF)
(2022) Juárez, Juliana María; Anunziata, Oscar Alfredo; Gómez Costa, Marcos Bruno
Nanotransporters have received a great deal of research attention because of their promising opportunities in drug delivery [1-5]. Attempting to minimize the secondary adverse events of anticancer drugs and enhance the therapeutic rate, various nanotransporters have been devised, including dendrimers [6, 7], liposomes [8, 9], inorganic nanoparticles, and polymeric nanoparticles [10-13]. Chlorambucil (CLB), is a substance classified as a human carcinogen [14], it is used as a chemotherapy drug administered for treating some types of cancer. It is mainly used to treat chronic lymphocytic leukemia, low-grade nonHodgkin's lymphoma, Hodgkin's lymphoma and ovarian cancer. Chemically, it is 4-[4-bis(2-chloroethyl) amino phenyl butyric acid. MCFs (mesostructured siliceous cellular foams), that can be derived after the inclusion of a bulking medium in the synthesis procedure of SBA-15 [4], are composed of spherically uniform cells 15-50 nm diameter [15], exhibit high surface areas and porosities, and have adjustable pore size distributions [15, 16]. The open large pore system gives MCF unique advantages as catalyst support and separation media for processes involving large molecules. In addition to their specific physicochemical properties, they possess high biocompatibility and low adverse effects, which with their biodegradability, making them attractive for controlled drug release applications.
Fe-CMK-3 nanostructured material applied in hydrogen uptake J.
(Catalysis Society of Australia, 2019) Juárez, Juliana María; Gómez Costa , Marcos Bruno; Anunziata, Oscar Alfredo
All over the world in the past decades, one of the most concerning subjects has been fossil fuel reduction, along with the global warming issue. These concerns have made hydrogen an ideal alternative to conventional fossil-fuel resources. Nevertheless, it has serious disadvantages, such as low volumetric and gravimetric densities that limit its storage [1]. One kind of OMC involves the carbon mesostructured from Korea (CMK). CMK-3 was chosen as a support material for hydrogen storage due to its large surface area, high chemical stability, uniform pore diameter, accessible porosity and three-dimensional conducting network [2]. Metal particles dispersed in the porosity of active carbons are largely contributing to enhanced storage abilities. In this work we studied the influence of the incorporation of iron nanoparticles inside the channels of CMK-3. This could help and make it possible storing hydrogen in carbon and silica matrix but with another mechanism, with a better reversibility improving hydrogen adsorption/desorption behavior.
H2 storage using Zr-CMK-3 developed by a new synthesis method
(2021) Juárez, Juliana María; Venosta, Lisandro F.; Anunziata, Oscar Alfredo; Gómez Costa, Marcos Bruno
One of the biggest problems in using hydrogen as an alternative fuel is that its storage must be safe and portable. This work addresses a new direct synthesis technique used to obtain a novel mesoporous carbon (CMK-3) modified with zirconium oxide. This novel material shows promise for hydrogen adsorption and storage application for energy harvesting. Zirconium oxide (Zr-CMK-3) material is achieved through successful synthesis and characterized by XRD, SEM, Raman, BET, UV-Vis-DRS, XPS and TEM analyses. Zr-CMK-3 signifi- cantly improved H2 storage performance (reaching at 77 K and 10 bar 4.6 wt%) compared to the pristine CMK-3. The novel material is favorable for H2 uptake by using weak bonding (physisorption). A hydrogen uptake mechanistic approach is proposed and the role of the Zr+4 cation in hydrogen adsorption is discussed.
Influence of ti incorporation to bimetallic mesoporous carbon in the production of 2,5‑dimethylfuran from biomass derivatives
(2021) Ledesma, Brenda Cecilia; Juárez, Juliana María; Domine, Marcelo E.; Beltramone, Andrea Raquel
Monometallic and bimetallic supported catalysts were developed to produce 2,5-dimethylfuran (DMF) trough hydrogenolysis of 5-(hydroxymethyl)furfural (HMF). Detailed physicochemical characterization was done to understand structure–activity correlation. Through a series of experiments and comparatives tests, the synergistic effect among Pt, Ir, and Ti incorporated in the support was investigated. Results revealed that using the titanium contained ordered mesoporous carbon, synthesized by a novel technique, high selectivity to DMF was achieved. In the case of the best catalyst PtIr-TiC, the good activity and excellent selectivity to the desired product DMF (98% yield) was related to the high hydrogenating capacity of the bimetal- lic sites, the acid support characteristics and the high metal nanoparticles dispersion achieved on the mesoporous titanium modified carbon support.
Influence of vanadium nanoclusters in hydrogen uptake using hybrid nanostructured materials
(Springer Science+Business Media, 2018) Juárez, Juliana María; Gómez Costa , Marcos Bruno; Martínez, María Laura; Anunziata, Oscar Alfredo
In this work, we report the synthesis and characterization of vanadium oxide nanoclusters (V2O5) supported in silica nano- structured material (SBA-15) and nanostructured carbon (CMK-3). This material is promising in hydrogen adsorption and storage application for energy harvesting. The materials with vanadium oxide nanoclusters (VxOy-SBA-15 and VxOy-CMK-3) were successfully synthesized and characterized by X-ray diffraction, textural properties, UV–Vis-DRS, X-ray photoelec- tron spectroscopy, temperature programmed reduction and transmission electron microscopy analyses. VxOy-SBA-15 and VxOy-CMK-3 improved significantly the H2 storage behavior (1.33 wt% and 3.43 wt% at 77 K and 10 bar) compared with their respective supports SBA-15 and CMK-3. The materials synthesized are promising in hydrogen uptake by weak link forces (physisorption). A mechanism of hydrogen adsorption was proposed and V5+ cation roll in hydrogen uptake was discussed
Influencia de nanoclusters de óxido de vanadio dispersos en materiales nanoestructurados híbridos en el almacenamiento de hidrógeno
(RITEQ, 2018) Juárez, Juliana María; Gómez Costa , Marcos Bruno; Martínez, María Laura; Anunziata, Oscar Alfredo
En todo el mundo en las últimas décadas, uno de los temas más preocupantes ha sido la reducción de los combustibles fósiles, junto con el problema del calentamiento global. Estas preocupaciones han convertido al hidrógeno en una alternativa ideal a los recursos fósiles convencionales. Un tipo de OMC, el carbón mesoestructurado de Corea (CMK), se sintetiza mediante la estrategia de nanocasting utilizando silicatos mesoporosos como plantillas; tiene un área superficial alta (de 1000 a 2000 m2 / g) y un volumen de poro en el rango de 0.5 a 1 ml.g-1. Por consiguiente, se eligió el CMK-3 como material de soporte para el almacenamiento de hidrógeno debido a su gran área superficial, alta estabilidad química, diámetro de poro uniforme, porosidad accesible y red tridimensional [Yang et al. (2005), Anbia et al. (2009), Anbia et al. (2011)]. Por otro lado, el material mesoporoso silíceo, SBA-15 muestra redes regulares y un diámetro de poro que fluctúa de 1.5 a 10 nm dependiendo del agente plantilla utilizado en su síntesis. Debido a su tamaño y forma de poros, es un material adecuado como absorbente para una variedad de gases y vapores [Schmidt et al. (1995), Soler-Illia (2002)]. En este trabajo estudiamos la influencia de la incorporación de nanopartículas de vanadio dentro de los canales de dos soportes diferentes, el silicato mesoporoso SBA-15 y el carbón mesoporoso CMK-3. Esta investigación incluye la síntesis del silicato mesoporoso y la síntesis de CMK-3 mediante la estrategia de nanocasting, la incorporación de nanoclusters de vanadio por impregnación de humedad, la caracterización de estos nanomateriales por XRD, adsorción de N2, XPS, TPR y UV-Vis, TEM y el estudio de la mejora en la adsorción de hidrógeno
Iron-modified mesoporous materials as catalysts for ODS of sulfur compounds
(2020) Rivoira, Lorena Paola; Juárez, Juliana María; Martínez, María Laura; Beltramone, Andrea Raquel
Fe-modified mesoporous catalysts were used in the ODS of DBTs using H2O2 as oXidant and acetonitrile as solvent. SBA-15, MCM-48, CMK-3 and CMK-1 were used as supports. Iron was incorporated using iron nitrate by wetness impregnation. The catalysts were characterized by XRD, N2 isotherms, TEM, XPS and ICP. We developed catalysts with high specific surface area, pore volume and narrow mesopore size distribution and highly dis- persed Fe- species. The catalysts were tested in the o Xidative desulfurization of different sulfur compounds as benzothiophene, dibenzothiopene and 4,6-dimethyl dibenzothiopene. The catalyst prepared using CMK-3 as support was the most active for the ODS reaction. The good activity was related with the high dispersion of the iron oXides, mainly in the magnetite phase. Temperature, hydrogen peroXide and sulfur initial concentration were studied using Fe-CMK-3 in the oXidation of DBT. The optimal operation conditions were determined. Fe- CMK-3 is an active and stable catalyst to be applied in the industrial process of ODS.
KETO/LP-SBA-15 composite as a drug release system
(Materials Research Society, 2018) Cussa, Jorgelina; Juárez, Juliana María; Prados , Antonela M.; Gómez Costa , Marcos Bruno; Anunziata, Oscar Alfredo
Controlled drug delivery systems can maintain the concentration of drugs in the exact sites of the body within the optimum range and below the toxicity threshold, improving therapeutic efficacy and reducing toxicity. SBA-15 with larger pore sizes material (LPSBA- 15) is a new promising host for drug delivery systems due to high biocompatibility, in vivo biodegradability and low toxicity. Large-pore mesoporous silica supports has been applied in studies of ketorolac tromethamine (KETO) adsorption and release. KETO/LP-SBA-15 composite was synthesized. The material synthesis and loading of KETO into LP-SBA-15 pores were successful. We obtained promising results for controlled drug release using the novel LP-SBA-15 material. The ability of KETO/LP-SBA-15 release was measured. The concentration of KETO in HCl solution or buffer in a specific time was determined by UV-Vis. First-order, Higuchi and Ritger-Peppas (or Korsmeyer-Peppas) models were used to fit experimental release data. Figure 1 show the fitting results, where Qt/Q∞ is the release fraction per unit mass in time t, k represents release rate in all models and n is a measure of desorption intensity in Ritger-Peppas regression. In this work, we have shown a promising drug storage material for the effective encapsulation and controlled release of KETO, achieving the required therapeutic efficacy. KETO was adsorbed into LP-SBA-15 channel surface without affecting the chemical structure or composition of KETO. The study also demonstrates the storage capacity and release properties of LP-SBA-15 containing KETO. The release of KETO contained in LP-SBA-15 can offer significant improve in controlled drug release and enhance a good analgesia effect.
LP-SBA-15/ketorolac nanocomposite: development, characterization, and mathematical modeling of controlled keto release
(2022) Cussa, Jorgelina; Juárez, Juliana María; Gómez Costa, Marcos Bruno; Anunziata, Oscar Alfredo
Drug-controlled release systems can keep the level of drugs in precise doses in the body above the optimal level and with low toxicity. We propose the nanomaterial LP-SBA-15 as an attractive new host for drug delivery systems due to its high biocompatibility, in vivo biodegradability, and low toxicity. LP-SBA-15/Ketorolac was prepared and characterized by XRD, FTIR, UV-Vis DRS, TEM, and texture analysis, determining the adsorption capacity and its release and achieving the required therapeutic efficacy. The host shows the ordered mesoporous nanochannels with a diameter of 11-12 nm, maintaining the structure with the incorporation of Keto. The mechanism of drug release from the LP-SBA-15 host was evaluated. Different mathematical models were used to adjust the experimental data, the Ritger-Peppas model followed by the Weibull model the best ones. The promising results we obtained for the release of the drug thoroughly using the new material, reaching a rapid initial release rate, and maintaining a constant rate afterward, allow us to maintain the concentration of the drug in the therapeutic efficacy range, applying it largely to the treatment of diseases that require a rapid response.
Mesoporous cellular foam (MCF): an efficient and biocompatible nanomaterial for the controlled release of chlorambucil
(2022) Juárez, Juliana María; Cussa, Jorgelina; Anunziata, Oscar Alfredo; Gómez Costa, Marcos Bruno
Nanotransporters have entered a great deal of exploration attention because of their promising openings in medicine delivery. We propose in this work, the Mesostructured siliceous cellular (MCFs) nanomaterial as a promising new host for drug delivery systems because both their specific physicochemical properties, in addition to the high biocompatibility, biodegradability, and low toxicity, make them seductive for controlled medicine release operations. Chlorambucil, is used as a chemotherapy drug administered for treating some types of cancer, chronic lymphocytic leukemia, low-grade non- Hodgkin’s lymphoma, Hodgkin’s lymphoma and ovarian cancer. Chlorambucil-loaded Mesostructured cellular foam (MCF-CLB) was prepared and characterized by XRD, TEM, UV- Vis DRS, FTIR, and texture analysis determining the adsorption capacity and its release, achieving the required therapeutic efficacy. The release of the drug was conducted by simulating the physiological conditions to reproduce the conditions of the organism. The mechanism of drug release from the MCF-CLB host was evaluated. Different mathematical models were used to adjust the experimental data, the best model describing the phenomenon under study over the entire period is the Weibull model. The auspicious results we attained for the release of the drug using the new material. The main advantage of this release is that the rate of release is fast at the beginning and then gradually decreases until 24 h practically all the drug contained in the carrier is released (> 95%).
Nanoclusters of iron oxice included in CMK-3mesoporous carbon use as hydrogen storage material
(Materials Research Society, 2019) Juárez, Juliana María; Venosta, Lisandro F.; Gómez Costa , Marcos Bruno; Anunziata, Oscar Alfredo
In this work we studied the influence of the incorporation of iron oxide nanoparticles inside the channels of the nanostructured mesoporous carbon CMK-3. This research includes synthesis of the mesoporous silicate and synthesis of CMK-3 by nanocasting strategy, incorporation of the iron oxide nanoclusters by wetness impregnation, characterization of these nanomaterials by XRD, N2 adsorption, XPS, and TEM, and study of the improvement in hydrogen adsorption. This material is promising in hydrogen adsorption and storage application for energy harvesting. According to XRD studies, the incorporation of oxide nanoclusters does not compromise the overall structure of the mesoporous carbon CMK-3. In the wide angle region it has been found typical reflections of iron oxide corresponding to the magnetite phase (Fe2+Fe3+ 2 O4). The modified sample Fe-CMK-3 reveal a reduced specific surface area and smaller pore diameter compared to pristine CMK-3 which involves the formation of magnetite nanoparticles within the mesoporous channels of CMK-3. TEM images of Fe-CMK-3 presents metallic oxide nanoparticles well dispersed. The incorporation of iron oxide nanoparticles improved significantly the H2 storage behavior (4.45% wt at 77K and 10 bar) compared to its respective support (CMK-3). Magnetite nanoclusters increased the capacity of hydrogen adsorption in pristine materials. Supposing that weakly orbital interactions occur between H2 and the metal nanocluster, physisorption is the main interaction, all cases have the potential to uptake H2 weakly as physisorption process and the last interaction achieves sufficiently strong energies to store more hydrogen to reach the level adsorption in Fe-CMK-3. In addition, no hydrogen chemisorption was detected. The materials synthesized are promising in hydrogen uptake by weak link forces (physisorption).
Nanoscopic hydrogen reservoir orange peel biowaste
(2022) Juárez, Juliana María; Ledesma, Brenda Cecilia; Anunziata, Oscar A.; Gómez Costa, Marcos Bruno; Beltramone, Andrea Raquel
This work addresses the bio-waste valorization approach for the development of a novel carbonaceous nanomaterial to be used in the adsorption of hydrogen as an alternative in the use of green hydrogen. In this research, activated carbons were synthesized orange peel using different synthesis conditions. With the activated carbons obtained with the best structure and texture, the adsorption of hydrogen and the effects on their meso / microporosity were studied. The activation of the carbon was carried out by means of a chemical process with phosphoric acid as activating agent, varying the acid concentration, the substrate / activating agent ratio, and the contact time between them. The best support was obtained using a carbonization time of 1 h, a carbonization temperature of 470oC, a phosphoric acid concentration of 50% by weight and a BET area of ??1402 m2 / g. Said material significantly improved H2 storage behaviour compared to CMK-3 type nanostructured carbon (3.1% by weight at -196,15 oC and 10 bar). The synthesized material shows promise in absorbing hydrogen by weak binding forces (physisorption).
Nanostructured ketorolac-tromethamine/MCF: synthesis, characterization and application in drug release system
(Current Nanoscience, 2018) Juárez, Juliana María; Cussa, Jorgeliba; Gómez Costa, Marcos Bruno; Anunziata, Oscar Alfredo
Controlled drug delivery systems can maintain the concentration of drugs in the exact sites of the body within the optimum range and below the toxicity threshold, improving therapeutic efficacy and reducing toxicity. Mesostructured cellular foam (MCF) material is a new promising host for drug delivery systems due to high biocompatibility, in vivo biodegradability and low toxicity.
Nanostructured SBA-15 host applied in ketorolac tromethamine release system
(Springer Science+Business Media, 2017) Cussa, Jorgelina; Juárez, Juliana María; Gómez Costa, Marcos Bruno; Anunziata, Oscar Alfreco
The ordered mesoporous silica SBA-15 has been applied in studies of ketorolac tromethamine adsorption andrelease. The SBA 15 materials with hexagonal and regular structure were obtained using a triblock copolymer Pluronic P123 as a template and TEOS as a silica source. Ketorolac tromethamine was adsorbed into SBA 15 silica nanochan- nels using ethanol as solvent. The physicochemical and textural properties of SBA-15 and ketorolac tromethamine/ SBA-15 were characterized by X-ray diffraction, thermo gravimetric analysis, transmission electron microscopy, fourier transform infrared spectroscopy and BET surface studies. Drug release was evaluated by soaking the loaded silica mesoporous material into a solution of HCl (0.1 N) at initial time (0–2 h) and buffer pH 7 at high times at 37 °C under continuous stirring. Oral commercial Keto tablets (Dolten® ) and Keto solution (Keto power) were study for the contrast. Release studies were performed in order to evaluate the required therapeutic efficacy. SBA 15 provides significant improvement in the controlled release of ketor- olac tromethamine.
Noble-biometallic supported CMK-3 as a novel catalyst for hydrogenation of tetralin in the presence of sulfur and nitrogen.
(Universidad Tecnológica Nacional Regional Córdoba., 2017) Vallés, Verónica Alejandra; Ledesma , Brenda Cecilia; Juárez, Juliana María; Gómez costa , Marcos Bruno; Anunziata, Oscar Alfredo; Beltramone , Andrea Raquel; Gómez costa , Marcos; Ledesma , Brenda
Carbon ordered mesoporous CMK-3 with high surface area and high pore volume promotes a very good dispersion of Pt or Ir monometallic and Pt-Ir-bimetallic crystallites in the carbon framework. High active and stable nanospecies are responsible for the good activity and selectivity found in the hydrogenation of tetralin to decalin in the presence of N as indole and S as dibenzothiophene under mild conditions in a Batch reactor. The catalysts prepared were extensively characterized by XRD, N2 adsorption isotherms, XPS, TEM, ICP, CO Chemisorption and TPR. The analysis showed that the carbon mesoporous structure was maintained after metal incorporation, and very high dispersed metal-supported catalyst was obtained. The activity was compared using the turnover number, Pt-Ir-CMK-3 being the most active cat alyst in the presence of the inhibitors. The bimetallic catalyst showed more resistance to inhibition than monometallic catalysts. The reusability of Pt-Ir-CMK-3 suggests that it is a potential catalyst for hydrotreating reactions.
Novel and simple one-pot method for the synthesis of TiO2 modified-CMK-3 applied in oxidative desulfurization of refractory organosulfur compounds
(Elsevier, 2018) Rivoira, Lorena Paola; Ledesma, Brenda Cecilia; Juárez, Juliana María; Beltramone, Andrea Raquel
Ti-CMK-3 carbon mesoporous was prepared using a novel synthesis method. This new method avoids the hard template synthesis used commonly. The precursors of silicon, carbon and titanium are incorporated together with the other components during the only step of the synthesis. The method developed here, allows reducing time and energy consumption by 60% and thus, the cost of the overall process of synthesis. Structural and textural characterization of the titanium modified-mesoporous carbon was performed by N2 adsorption, XRD, UV–Vis-DRS, XPS, Raman spectroscopy and TEM. The characterization results indicated that the textural and structural properties of the material synthesized by the short time method are comparable with the properties of the material prepared by the hard template method. Ti modified-mesoporous carbon was synthesized by dif- ferent methods in order to prepare catalysts to be tested in the oxidative desulfurization (ODS) of sulfur com- pounds. The catalyst prepared by the one-pot method is capable to oxidize high amount of sulfur (2000 ppm) in only 30 min of reaction time at 60–80 °C. The good performance and stability of the catalyst prepared using a novel synthesis method was attributed to well dispersed anatase nanospecies over the high area mesoporous carbon. Main advantage of the present study is the reduction of time and cost in the synthesis of the new material and the applicability for ODS reactions.

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