COMPARISON OF PD(NH3)(4)(2+) DECOMPOSITION AND PD2+ REDUCTION IN ZEOLITES NAY, NAX AND CSX

被引:13
作者
SAUVAGE, A
MASSIANI, P
BRIEND, M
BARTHOMEUF, D
BOZONVERDURAZ, F
机构
[1] UNIV PARIS 06,REACTIV SURFACE LAB,CNRS,URA 1106,F-75252 PARIS 05,FRANCE
[2] UNIV DENIS DIDEROT,CHIM MAT DIVISES & CATALYSE LAB,F-75251 PARIS 05,FRANCE
来源
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS | 1995年 / 91卷 / 18期
关键词
D O I
10.1039/ft9959103291
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 decomposition of Pd(NH3)(4)(2+) and further reduction to Pd-0 in Pd6.4NaY and three zeolites differing in alkalimetal cation or Pd loading (Pd(2.9)NaX, Pd(7.4)NaX and Pd(8.2)CsX) are investigated by TPO, TPR and UV-VIS-NIR spectroscopy. With regard to the temperature, the order for the decomposition of the ammine complex is PdCsX < PdNaX < PdNaY and that for the reduction of bare Pd2+ ions located in the same type of cage within the zeolites is PdCsX < PdNaX approximate to PdNaY. These orders depend an the stabilization of the various intermediate Pd complexes. It is shown that NaX favours the location of Pd2+ ions in the inner sites (i.e. sodalite and hexagonal prism). Parameters important for the various locations of Pd complexes are discussed in terms of the zeolite basicity and steric hindrance for migration of Pd(NH3)(x)(2+) complexes or Pd2+ ions in the inner cavities.
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页码:3291 / 3297
页数:7
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