Abstract
The catalytic performance of Pt clusters towards formaldehyde (HCHO) oxidation was activated by tuning the valence of vanadium (V) element within a VxOy support. Through a facile but efficient solvothermal synthesis and heat-treatment process, the V valence can be precisely regulated from V4+ to V5+. Subsequently, the HCHO catalytic oxidation rate of Pt/VxOy catalyst has dramatically increased from 0.0146 to 0.0294 mmol·h−1·m−2 at 15 °C. The increased V valence has effectively accelerated the charge transfer from VxOy support to Pt cluster, and promoted the upshift of d-band center of the Pt element, leading to a low reduction temperature of Pt2+ to Pt0 and high production of reactive adsorbed oxygen. This study provides a simple but feasible strategy to tune the valence of V element within VxOy and offers new insights for the study of other possible multivalent metal oxides used in different catalytic reactions.
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