CHEMICAL INTERACTION OF PALLADIUM PARTICLES WITH IRON CATIONS IN NAY

被引:20
作者
HOMEYER, ST [1 ]
SHEU, LL [1 ]
ZHANG, Z [1 ]
SACHTLER, WMH [1 ]
BALSE, VR [1 ]
DUMESIC, JA [1 ]
机构
[1] UNIV WISCONSIN, DEPT CHEM ENGN, MADISON, WI 53706 USA
来源
APPLIED CATALYSIS | 1990年 / 64卷 / 1-2期
关键词
adsorption; catalyst characterization (Mössbauer spectroscopy; EXAFS); FT-IR; iron; palladium; TPD; TPR; zeolites;
D O I
10.1016/S0166-9834(00)81563-8
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
TPR results show that Pd in PdFe/NaY samples strongly catalyzes the reduction by hydrogen of Fe3+ to Fe2+. Mössbauer data demonstrate an interaction of reduced palladium particles with Fe2+ cations in the zeolite; TPD of hydrogen reveals that this interaction increases with increasing reduction temperature. FT-IR spectra of adsorbed carbon monoxide indicate that Fe cations adhere to the surface of the Pd particles, similar to Ti ions on TiO2-supported group VIII metals in the SMSI state. After high-temperature reduction, the Pd coordination number derived from EXAFS is lower for PdFe/NaY than for Pd/NaY. It is proposed that Fe cations, which decorate the Pd particles, inhibit the migration of the particles by coulombic interaction with the zeolite lattice. © 1990.
引用
收藏
页码:225 / 241
页数:17
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