Investigation of dispersion and localization of platinum species in mazzite using EXAFS

被引：11

作者：

Khodakov, A

Barbouth, N

Oudar, J

Villain, F

Bazin, D

Dexpert, H

Schulz, P

机构：

[1] UNIV PARIS 11,LURE,F-91405 ORSAY,FRANCE

[2] ECOLE NATL SUPER CHIM,CNRS,URA 425,LAB PHYSICOCHIM SURFACES,F-75231 PARIS 05,FRANCE

[3] ELF ANTAR FRANCE,CTR RECH SOLAIZE,F-69360 SOLAIZE,FRANCE

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 1997年 / 101卷 / 05期

关键词：

D O I：

10.1021/jp9620577

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：

Dispersion and localization of Pt species in mazzite zeolites (0.3% Pt) were studied using an in situ EXAFS technique in the fluorescence mode and transmission electron microscopy. It was shown that an ion exchange with a Pt(NH3)(4)Cl-2 solution followed by calcination led to the formation of small clusters of PtO2 located in the mazzite channels. Small metal particles (N-Pt-Pt < 4) were found in the zeolite after the reduction of Pt species with hydrogen. The comparison of the results gained with the TEM and EXAFS techniques showed that most of the Pt metal particles were located in the zeolite channels, Treatment of the Pt/mazzite with humid hydrogen at 823 K was found to result in the agglomeration of Pt metal particles up to the diameter of mazzite channels (7.4 Angstrom).

引用

页码：766 / 770

页数：5

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