[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.