Journal
NEW JOURNAL OF CHEMISTRY
Volume 45, Issue 32, Pages 14695-14702Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1nj02764f
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Funding
- National Natural Science Foundation of China [21872124, 22072137]
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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).
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