XPS study of Pt ammine decomposition in K faujasites: Comparison with bulk behavior

被引：6

作者：

Bastl, Z ^{[1
]}

Kubelkova, L ^{[1
]}

Novakova, J ^{[1
]}

机构：

[1] ACAD SCI CZECH REPUBL, J HEYROVSKY INST PHYS CHEM, PRAGUE 18223 8, CZECH REPUBLIC

来源：

ZEOLITES | 1997年 / 19卷 / 04期

关键词：

Pt-tetrammine in faujasites; temperature decomposition of; Pt-clusters; XPS; FT ir; tpd;

D O I：

10.1016/S0144-2449(97)00066-3

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 XPS method is employed to compare the behavior of [Pt(NH3)(4)](2+) ions in the surface layers of KX and KY zeolites with that in the zeolite bulk. FT i.r. and MS-t.p.d. methods are used to characterize the bulk properties. XPS and FT i.r. reveal the formation of different intermediate NH, species during the decomposition of the ammine complex in a vacuum. They are interpreted as Pt-diammine, framework ammine, and immine complexes. The maximum evolution of ammonia occurs in the temperature interval ranging from 150 degrees C to 250 degrees C. Positive shifts of Pt (4f) photoelectrons, observed for samples with a decomposed Pt-ammine complex, are explained by a decrease of the population of Pt 5d levels in encaged metallic clusters. The surface concentration of Pt decreases with increasing temperature due to the inward diffusion of Pt atoms. (C) Elsevier Science Inc. 1997.

引用

页码：279 / 287

页数：9

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