Mesoporous silica and carbon based catalysts for esterification and biodiesel fabrication-The effect of matrix surface composition and porosity
| Autor: | Gabriel A. Planes, Cesar A. Barbero, Emma M. Björk, Magnus Odén, M. Sergio Moreno, Diego F. Acevedo, Luciano H. Tamborini, María Paula Militello, Rusbel Coneo Rodriguez |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Process Chemistry and Technology
Catalyst support chemistry.chemical_element 02 engineering and technology Transesterification Mesoporous silica 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis 0104 chemical sciences chemistry.chemical_compound chemistry Chemical engineering Kemiska processer Nafion Reagent Chemical Process Engineering Organic chemistry 0210 nano-technology Mesoporous material Carbon Mesoporous carbon Fischer esterification Biodiesel |
| Popis: | The effects of catalyst matrix porosity composition on the catalytic performance have been studied using sulfonated mesoporous SBA-15 silica. The matrix was sulfonated with three different methods grafting, in situ oxidation, and carbon infiltration. Additionally, unordered sulfonated mesoporous carbon, and the commercial catalysts Amberlite IR-120 and Nafion 117 were tested. The catalytic performance was evaluated in a Fischer esterification using acetic acid and ethanol, as well as in a transesterification of triglycerides (sunflower oil) and ethanol to produce biodiesel. The study shows that for long carbon chains, the effective wetting of the porous catalyst matrix by the reactants is most important for the catalytic efficiency, while for shorter carbon chain, the mass transport of the reagents trough the porous structure is more important. The catalysts were analysed using electron microscopy and physisorption. The study shows that the reactions are faster with carbon infiltrated materials than the silica materials due to a higher concentration of sulfonic groups linked to the carbon. The in situ functionalized SBA-15 is a more efficient catalyst compared to the post grafted one. All the synthesized catalysts outperform the commercial ones in both reactions in terms of conversion. (C) 2017 Elsevier B.V. All rights reserved. Funding Agencies|SUMA2 Network Project, 7th Framework Program of the European Commission (IRSES) [318903]; Knut and Alice Wallenberg Foundation [KAW 2012.0083]; CONICET; FONCYT; MinCyT-Cordoba; SECYT-UNRC |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|