Nanoarcillas sintéticas para ser empleadas en la valorización de glicerol a carbonato de glicerilo
Date
2020
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
La producción de biodiesel se acompaña de un 10% en peso de glicerol como subproducto, por lo que resulta factible que pueda ser utilizado como materia prima renovable para favorecer económicamente el proceso. La conversión catalítica de glicerol hacia un producto de mayor valor agregado, como el carbonato de glicerilo, es una opción atractiva porque se lo considera como un sustituto verde de importantes compuestos derivados del petróleo. Además, presenta numerosas aplicaciones en la industria química, farmacéutica, cosmética, etc. Como alternativa sustentable para producirlo se propone la transesterificación entre el glicerol y un alquil carbonato empleando catalizadores sólidos como los óxidos metálicos mixtos derivados de nanoarcillas aniónicas sintéticas, en condiciones suaves de reacción y sin el empleo de solvente. Estos materiales presentan gran interés por la posibilidad de nano-diseño a medida, control de accesibilidad a sitios activos y muy bajo costo de síntesis. Se sintetizaron óxidos de Mg y Al con Cu incorporado en diferentes contenidos, por el método de coprecipitación, para ser empleados en la reacción de transesterificación entre glicerol y etilencarbonato. Los materiales fueron caracterizados fisicoquímicamente mediante DTP-CO2, FTIR y XPS. Los materiales sintetizados mostraron una elevada actividad para la producción selectiva de carbonato de glicerilo, atribuido a la fuerte basicidad de superficie combinada con la presencia de sitios ácidos. El catalizador más activo fue el óxido con un contenido de Cu del 25% con un 91,9% de conversión de glicerol y 99,2 % de selectividad a carbonato de glicerilo.
Biodiesel production is accompanied by 10 wt.% of glycerol as a by-product. Thus, the use of glycerol as a renewable raw material could be an economical advantage to the process. The catalytic conversion of glycerol to a higher value-added product such as glyceryl carbonate is an attractive option. Glyceryl carbonate is considered a green substitute for important petroleum-derived compounds. In addition, it has numerous applications in the chemical, pharmaceutical and cosmetic industries. The transesterification reaction between glycerol and an alkyl carbonate is a sustainable alternative when solid catalysts such as mixed metal oxides derived from synthetic anionic nano-clays are evaluated, along with under mild reaction conditions and without solvent employment. The great interest in the use of these materials is due to the possibility of custom nano-design, accessibility control to active sites and very low cost synthesis. The Mg and Al oxides with Cu incorporated in different loads were synthesized by the coprecipitation method. The materials were characterized physicochemically by TPD-CO2, FTIR and XPS and evaluated in the reaction between glycerol and ethylene. All samples with Cu incorporated showed significant activity to selective glyceryl carbonate production. Those catalytic performances could be attributed to the strong basicity on the surface combined with the acid sites presence of the materials. The most active catalyst
Biodiesel production is accompanied by 10 wt.% of glycerol as a by-product. Thus, the use of glycerol as a renewable raw material could be an economical advantage to the process. The catalytic conversion of glycerol to a higher value-added product such as glyceryl carbonate is an attractive option. Glyceryl carbonate is considered a green substitute for important petroleum-derived compounds. In addition, it has numerous applications in the chemical, pharmaceutical and cosmetic industries. The transesterification reaction between glycerol and an alkyl carbonate is a sustainable alternative when solid catalysts such as mixed metal oxides derived from synthetic anionic nano-clays are evaluated, along with under mild reaction conditions and without solvent employment. The great interest in the use of these materials is due to the possibility of custom nano-design, accessibility control to active sites and very low cost synthesis. The Mg and Al oxides with Cu incorporated in different loads were synthesized by the coprecipitation method. The materials were characterized physicochemically by TPD-CO2, FTIR and XPS and evaluated in the reaction between glycerol and ethylene. All samples with Cu incorporated showed significant activity to selective glyceryl carbonate production. Those catalytic performances could be attributed to the strong basicity on the surface combined with the acid sites presence of the materials. The most active catalyst
Description
Keywords
Glicerol, Carbonato de glicerol, Catálisis heterogénea, Óxidos mixtos, Glycerol, Glycerol carbonate, Heterogeneous catalysis, Mixed oxides
Citation
Endorsement
Review
Supplemented By
Referenced By
Creative Commons license
Except where otherwised noted, this item's license is described as openAccess