Abstract
Oxygen defects, surface acidity and catalytic activity of Keggin-type phosphotungstic acid dispersed on SBA-15 mesoporous catalyst were investigated. When the catalyst was calcined at different temperature, oxygen defects resulted from removal of terminal oxygen from W=O bond or cleavage of corner sharing W–Oc–W bond in the Keggin structure via dehydration or/and suface dehydroxylation. The catalyst contained both Lewis (L) and Bronsted (B) acid sites and their amount varied with the calcination temperature which could be correlated well with the conversion of 4,6-dibenzothiophene (4,6-DMDBT) in a model diesel using H2O2 as oxidant. L acid sites served as active sites for 4,6-DMDBT adsorption via electron donation-acception pathway and B acid sites helped oxygen transferring from peroxotungstate complex to sulfur atom in the adsorbed 4,6-DMDBT, benefiting the sulfone formation.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
