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Photo–thermo Catalytic Oxidation over a TiO2-WO3-Supported Platinum Catalyst

Journal Article · · Angewandte Chemie
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  1. Chinese Academy of Sciences (CAS), Dalian (China)
  2. Chinese Academy of Sciences (CAS), Dalian (China); Chinese Academy of Sciences (CAS), Beijing (China)
  3. Stony Brook Univ., NY (United States)
  4. Stony Brook Univ., NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
+ Show Author Affiliations
Photo–thermo catalysis, which integrates photocatalysis on semiconductors with thermocatalysis on supported nonplasmonic metals, has emerged as an attractive approach to improve catalytic performance. However, an understanding of the mechanisms in operation is missing from both the thermo- and photocatalytic perspectives. Deep insights into photo–thermo catalysis are achieved via the catalytic oxidation of propane (C3H8) over a Pt/TiO2-WO3 catalyst that severely suffers from oxygen poisoning at high O2/C3H8 ratios. After introducing UV/Vis light, the reaction temperature required to achieve 70 % conversion of C3H8 lowers to a record-breaking 90 °C from 324 °C and the apparent activation energy drops from 130 kJ mol-1 to 11 kJ mol-1. Furthermore, the reaction order of O2 is -1.4 in dark but reverses to 0.1 under light, thereby suppressing oxygen poisoning of the Pt catalyst. An underlying mechanism is proposed based on direct evidence of the in-situ-captured reaction intermediates.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-03ER15476; SC0012704
OSTI ID:
1637654
Alternate ID(s):
OSTI ID: 1631337
Report Number(s):
BNL-216121-2020-JAAM
Journal Information:
Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 31 Vol. 132; ISSN 1521-3757; ISSN 0044-8249
Publisher:
German Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY