FTIR study of hydrogen and carbon monoxide adsorption on Pt/TiO2, Pt/ZrO2, and Pt/Al2O3

被引：111
|
作者：
Benvenutti, EV
Franken, L
Moro, CC
Davanzo, CU
机构：
[1] UFRGS, LSS, Inst Quim, BR-91501970 Porto Alegre, RS, Brazil
[2] UNICAMP, Inst Quim, BR-13081970 Campinas, SP, Brazil
来源：
LANGMUIR | 1999年 / 15卷 / 23期
关键词：
D O I：
10.1021/la990195s
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The Pt/TiO2, Pt/ZrO2, and Pt/Al2O3 catalysts submitted to low-temperature reduction (LTR, 200 degrees C) and high-temperature reduction (HTR, 500 degrees C) and exposed to hydrogen and carbon monoxide at room temperature were studied by infrared spectroscopy. There is a strong loss of transmission in the entire infrared spectra on Pt/TiO2 after its exposure to hydrogen, which is related to the reducibility of the support. A typical SMSI behavior (strong metal-support interaction), such as the decrease in carbon monoxide adsorption capacity, was detected on Pt/TiO2 and Pt/ZrO2 after exposure to hydrogen, even for the catalysts submitted to LTR treatment. Also a carbonyl band shift to lower wavenumber was observed on LTR-treated Pt/TiO2, Pt/ZrO2, and Pt/Al2O3 after exposure to hydrogen. We interpreted this SMSI behavior as an electronic rather than morphological effect, which was induced by the presence of hydrogen spillover.
引用
收藏
页码：8140 / 8146
页数：7
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