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

页码：225 / 241

页数：17

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