REVERSIBLE REDOX BEHAVIOR BETWEEN SILVER CATIONS AND SILVER METAL PARTICLES IN HYDRATED AG-Y ZEOLITES

被引:29
作者
BABA, T [1 ]
AKINAKA, N [1 ]
NOMURA, M [1 ]
ONO, Y [1 ]
机构
[1] TOKYO INST TECHNOL,DEPT CHEM ENGN,MEGURO KU,TOKYO 152,JAPAN
来源
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1993年 / 89卷 / 03期
关键词
D O I
10.1039/ft9938900595
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
Redox behaviour of Ag+ ions in Ag+-exchanged Y-zeolite (Ag-Y) has been investigated by the measurement of hydrogen consumption at 303 K, X-ray diffraction of Ag metal particles and IR spectra of CO chemisorbed on Ag+ ions. X-Ray diffraction gave evidence of the fully reversible interconversion between Ag+ ions and Ag metal particles upon introduction and withdrawal of hydrogen in Ag-Y partially reduced with hydrogen. The reversible variation of the amount of Ag+ ions was also observed by IR spectra of CO adsorbed on Ag+ ions. The reversibility was also confirmed by hydrogen adsorption experiments. The conversion of Ag metal particles back into Ag+ ions is enhanced by water molecules adsorbed on Ag-Y. The interconversion between Ag+ cations and Ag metal particles became partially reversible with increasing the degree of Ag+ ion reduction.
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页码:595 / 599
页数:5
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