A LOW-TEMPERATURE IR SPECTROSCOPIC STUDY OF SELECTIVE ADSORPTION OF NO AND CO ON CUO/GAMMA-AL2O3

被引:110
作者
FU, Y [1 ]
TIAN, YC [1 ]
LIN, PY [1 ]
机构
[1] UNIV SCI & TECHNOL CHINA,STRUCT RES LAB,HEFEI 230026,PEOPLES R CHINA
基金
中国国家自然科学基金;
关键词
D O I
10.1016/0021-9517(91)90249-4
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The composition of the crystal phase and the valence state of surface copper ions was measured by XRD and XPS methods on a CuO/γ-Al2O3 catalyst. It was concluded that the bulk phase was composed of CuO and CuAl2O4, and Cu2+ and Cu+ ions coexisted on the surface, although the sample was oxidized in oxygen atmosphere. The infrared spectra of CO, NO, and (CO + NO) adsorbed on this catalyst were recorded from 123 to 173 K. All infrared bands were assigned. The adsorption experiment of CO and NO also demonstrated that Cu2+ (CuO and CuAl2O4) and Cu+ ions coexisted on the surface. CO or NO could be adsorbed on Cu2+ and Cu+ sites below 173 K, but CO was only adsorbed on Cu+ sites and NO only on CU2+ sites over 173 K. The alternate adsorption and coadsorption of NO and CO found that CO was selectively adsorbed on the Cu+ sites (2120 cm-1 band) and NO was selectively adsorbed on the Cu2+ sites (1888 cm-1 on CuO and 1862 cm-1 on CuAl2O4), when CO and NO coexisted in the gas phase. © 1991.
引用
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页码:85 / 91
页数:7
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