RSM in the analysis of conversion of DBT in oxidative desulfurization using vanadium-SBA-15 catalysts modified with AI and Ga.
Date
2018
Journal Title
Journal ISSN
Volume Title
Publisher
Univesidsad Tecnológica Nacional.
Abstract
Experiment design-response surface methodology (RSM) was used 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. Conversion at 15 min is the analyzed response. 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; optimal ratio between g DBT/g of catalyst was 4 and 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
RSM, DBT, SBA-15, AL and Ga
Citation
2nd International Conference on Catalysis and Chemical Engeneering 2018.
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