Experimental desing optimization of the ODS of DBT using vanadium oxide supported on mesoporous Ga-SBA-15.
Date
2020
Journal Title
Journal ISSN
Volume Title
Publisher
Universidad Tecnológica Nacional Regional Córdoba.
Abstract
Experiment design-response surface methodology is applied in this work to
model and optimize the oxidation of dibenzothiophene (DBT) using VOx-Ga SBA-15 catalyst. The analyzed variables are the influence of the nature of
the catalyst (V and Ga loading), the substrate/catalyst mass ratio (g DBT/g of
catalyst) and the oxidant/substrate molar ratio (H2O2/DBT). The response
analyzed is conversion of DBT at 15 min of reaction time. A set of re- sponse
surfaces were obtained applying the Box-Behnken Design. Based on
statistical methodology it was pos- sible to find the best arrangement between
the amounts of the gallium heteroatom and the vanadium active species. 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 between H2O2/DBT was 5.
Gallium incorporation as heteroatom in tetrahedral position allowed the better
anchorage of the active species of vanadium, generating a very well
dispersed catalyst. The optimized catalyst minimized the mass transfer
limitation and moreover, was active after several recycles. The best catalyst
was likewise very active for the oxidation of the most refractory sulfur
compounds as benzothiophene and 4,6-dimetyldi- benzothiopene.
Description
Keywords
VOx soportado sobre Ga-SBA-15, Dibenzothiophene, Ultra-low-sulfur- diésel, Ultra-low-sulfur diésel, RSM, Gallium
Citation
Catalysis Today Journal homepage
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