期刊
NEW JOURNAL OF CHEMISTRY
卷 45, 期 32, 页码 14695-14702出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1nj02764f
关键词
-
资金
- National Natural Science Foundation of China [21872124, 22072137]
The study demonstrates that MoO3 promoted Pt/ZrO2 catalysts exhibit higher catalytic activity and reduced activation energy in propane combustion.
MoO3 promoted Pt/ZrO2 catalysts were prepared by co-impregnation (Pt-Mo/ZrO2) or stepwise impregnation (Pt/Mo/ZrO2 and Mo/Pt/ZrO2) for propane combustion. The impregnation order affects the density of active Pt-MoO3 interfacial sites, in the order of: Pt-Mo/ZrO2 (7.60 mu mol gcat-1) > Pt/Mo/ZrO2 (3.40 mu mol gcat-1) > Mo/Pt/ZrO2 (1.20 mu mol gcat-1). The turnover frequency, TOFPt-MoO3, of Pt-MoO3 interfacial sites is much higher than the TOFPt of Pt active sites (at least 50 folds). Thus, the catalytic activity for propane combustion is in the order of: Pt-Mo/ZrO2 > Pt/Mo/ZrO2 > Mo/Pt/ZrO2 > Pt/ZrO2. Kinetic results illustrate that the MoO3 promotion significantly weakens the strong adsorption of oxygen species on the catalyst and enhances the catalytic activity. The activation energy is reduced the most over the Pt-Mo/ZrO2 catalyst (Ea of the Pt/ZrO2 catalyst: 102.8 +/- 4.8 kJ mol-1; Ea of the Pt-Mo/ZrO2 catalyst: only 40.3 +/- 1.8 kJ mol-1).
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据