Experimental desing optimization of the ods of DBT using V2O5 supported on GA-SBA-15.
Date
2020
Journal Title
Journal ISSN
Volume Title
Publisher
Univesidsad Tecnológica Nacional.
Abstract
Experiment design-response surface methodology (RSM) was used in this
work to model and optimize one response in the oxidative
desulfurization of dibenzothiophene with hydrogen peroxide using VOx Ga-SBA-15 catalysts with different Ga/Si and V/Si ratios. In this study,
we analyze the influence of the nature of the catalyst (metal/Si ratio),
the substrate/catalyst mass ratio and the oxidant/substrate ratio as
factors for the design. The response analyzed was conversion at 15 min
of reaction time. The response surfaces were obtained with the Box–
Behnken Design, finding the best combination between the reaction
parameters that allowed optimizing the process. By applying the statistic
methodology, the higher levels of the objective function were obtained
employing the catalyst with 4 wt.% of gallium and 6 wt.% of vanadium;
the optimal ratio between g DBT/g of catalyst was 4 and the molar ratio
H2O2/DBT was 5.
The incorporation of gallium as heteroatom in tetrahedral position allows
the better anchorage of the active species of vanadium generating a
very well dispersed catalyst.
Structural and textural characterization of the catalysts were performed
by means of XRD, N2 adsorption, UV–Vis–DRS, XPS, NMR, TEM, Raman,
TPR and Py-FTIR. UV–Vis–DRS and Raman demonstrated that highly
dispersed vanadium pentoxide crystallites are responsible for the high
activity in the sulfur removal. The high dispersion depended on the
vanadium loading and on the nature of the support.
The experiment design was able to find the best combination between
the heteroatom and the vanadium active site in order to find the most
active catalyst for ODS of DBT at the optimized experimental conditions.
Description
Keywords
ODS, DBT, V2O5, Ga-SBA-15
Citation
2nd International Conference and Exhibition on Materials Science and Chemistry.
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