Characterization and catalytic tests of Au/MFI prepared by sublimation of AuCl3 onto HMFI

被引：37

作者：

Gao, ZX ^{[1
]}

Sun, Q ^{[1
]}

Chen, HY ^{[1
]}

Wang, X ^{[1
]}

Sachtler, WMH ^{[1
]}

机构：

[1] Northwestern Univ, Dept Chem, VN Ipatieff Lab, Ctr Catalysis & Surface Sci, Evanston, IL 60208 USA

来源：

CATALYSIS LETTERS | 2001年 / 72卷 / 1-2期

关键词：

Au/MFI; sublimation method; gold carbonyl; NO reduction; N2O and NO decomposition;

D O I：

10.1023/A:1009005731581

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：

Au/MFI was prepared by sublimation of AuCl3 onto HMFI. The oxidation state of the gold in the as-synthesized sample is Au3+. Upon heating in He or O-2, it transforms into gold metal and electron-deficient gold particles which agglomerate to larger Au particles. Reduction of Au3+ with CO to Au+ is accompanied by formation of an Au+(CO) complex. The carbonyl ligand has a remarkable stabilization effect on Au+ ions in zeolite cages. Strong IR bands show the CO vibration, and also the strong perturbation of the T-O-T vibrations of the zeolite lattice. [Au+(CO)]/MFI has a characteristic XRD pattern and is stable up to 200 degreesC. Au/MFI catalyzes the decomposition of N2O to N-2 even in the presence of 3% O-2. With hydrocarbons or NH3 as the reductant, it has some NOx reduction activity, but these catalysts deactivate at higher temperature even in inert gas atmosphere.

引用

页码：1 / 5

页数：5

共 24 条

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