TY - JOUR
T1 - Roles of oxygen defects and surface acidity of Keggin-type phosphotungstic acid dispersed on SBA-15 catalysts in the oxidation of 4,6-dimethyldibenzothiophene
AU - de la Fuente, Natali
AU - Chen, Lifang
AU - Wang, Jin An
AU - González, Julio
AU - Navarrete, Juan
N1 - Publisher Copyright:
© 2021, Akadémiai Kiadó, Budapest, Hungary.
PY - 2021/4
Y1 - 2021/4
N2 - 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 Brønsted (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. Graphic abstract: [MediaObject not available: see fulltext.].
AB - 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 Brønsted (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. Graphic abstract: [MediaObject not available: see fulltext.].
KW - 4,6-Dibenzothiophene
KW - Acidity
KW - HO
KW - Oxygen defect
KW - Phosphotungstic acid
UR - http://www.scopus.com/inward/record.url?scp=85103355195&partnerID=8YFLogxK
U2 - 10.1007/s11144-021-01966-1
DO - 10.1007/s11144-021-01966-1
M3 - Artículo
AN - SCOPUS:85103355195
SN - 1878-5190
VL - 132
SP - 1119
EP - 1135
JO - Reaction Kinetics, Mechanisms and Catalysis
JF - Reaction Kinetics, Mechanisms and Catalysis
IS - 2
ER -