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Abstract：
In this study, the reaction mechanisms of photodriven CO oxidation over both anatase and rutile TiO2 have been investigated from the hydrogen adsorption behavior. It can be beneficial when H-2 is introduced into CO oxidation system to increase the catalytic activity of rutile, while to decrease the catalytic activity of anatase. Further analysis revealed that H-2 molecule is dissociated on anatase surface, and then produce oxygen vacancies by dehydroxylation under UV irradiation. In contrast, the adsorbed H-2 (H-2 (ads)) with a non-dissociative mode does not activate the lattice oxygen (O-lat) over rutile. For anatase, CO oxidation reaction mainly undergoes the O-lat, activation process, while H-2 (ads) can inhibit the O-lat, activation, resulting in a suppressed CO oxidation. For rutile, the surface hydroxyls are the active species for CO oxidation, while H-2 (ads) can promote to form more surface hydroxyl species, resulting in a promoted CO oxidation.
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APPLIED CATALYSIS B-ENVIRONMENTAL
ISSN： 0926-3373
Year： 2020
Volume： 277
1 9 . 5 0 3
JCR@2020
2 0 . 3 0 0
JCR@2023
ESI Discipline： CHEMISTRY;
ESI HC Threshold：160
JCR Journal Grade：1
CAS Journal Grade：1
Cited Count：
WoS CC Cited Count： 27
SCOPUS Cited Count： 28
ESI Highly Cited Papers on the List： 0 Unfold All
WanFang Cited Count：
Chinese Cited Count：
30 Days PV： 0
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