催化作用
光催化
丙烷
铂金
光化学
反应机理
氧气
材料科学
化学
化学工程
有机化学
工程类
作者
Leilei Kang,Xiao Yan Liu,Aiqin Wang,Lin Li,Yujing Ren,Xiaoyü Li,Xiaoli Pan,Yuanyuan Li,Xu Zong,Hua Liao,Anatoly I. Frenkel,Tao Zhang
标识
DOI:10.1002/anie.202001701
摘要
Abstract 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 (C 3 H 8 ) over a Pt/TiO 2 ‐WO 3 catalyst that severely suffers from oxygen poisoning at high O 2 /C 3 H 8 ratios. After introducing UV/Vis light, the reaction temperature required to achieve 70 % conversion of C 3 H 8 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 O 2 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.
科研通智能强力驱动
Strongly Powered by AbleSci AI