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

Zhi Xian Gao; Qi Sun; Hai Ying Chen; Xiang Wang; Wolfgang M.H. Sachtler

doi:10.1023/A:1009005731581

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

Zhi Xian Gao, Qi Sun, Hai Ying Chen, Xiang Wang, Wolfgang M.H. Sachtler

Research output: Contribution to journal › Article › peer-review

36 Scopus citations

Abstract

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 O₂, 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°C. Au/MFI catalyzes the decomposition of N₂O to N₂ even in the presence of 3% O₂. With hydrocarbons or NH₃ as the reductant, it has some NO_x reduction activity, but these catalysts deactivate at higher temperature even in inert gas atmosphere.

Original language	English
Pages (from-to)	1-5
Number of pages	5
Journal	Catalysis Letters
Volume	72
Issue number	1-2
DOIs	https://doi.org/10.1023/A:1009005731581
State	Published - Mar 2001
Externally published	Yes

Funding

Financial aid from the Director of the Chemistry Division, Basic Energy Science, US Department of Energy, Grant DE-FGO2–87ER13654, is gratefully acknowledged. ZXG thanks the China Scholarship Council for its generous financial support.

Keywords

Au/MFI
Gold carbonyl
NO and NO decomposition
NO reduction
Sublimation method

Access to Document

10.1023/A:1009005731581

Cite this

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title = "Characterization and catalytic tests of Au/MFI prepared by sublimation of AuCl3 onto HMFI",

abstract = "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 O2, 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°C. Au/MFI catalyzes the decomposition of N2O to N2 even in the presence of 3% O2. 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.",

keywords = "Au/MFI, Gold carbonyl, NO and NO decomposition, NO reduction, Sublimation method",

author = "Gao, {Zhi Xian} and Qi Sun and Chen, {Hai Ying} and Xiang Wang and Sachtler, {Wolfgang M.H.}",

year = "2001",

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T1 - Characterization and catalytic tests of Au/MFI prepared by sublimation of AuCl3 onto HMFI

AU - Gao, Zhi Xian

AU - Sun, Qi

AU - Chen, Hai Ying

AU - Wang, Xiang

AU - Sachtler, Wolfgang M.H.

PY - 2001/3

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N2 - 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 O2, 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°C. Au/MFI catalyzes the decomposition of N2O to N2 even in the presence of 3% O2. 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.

AB - 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 O2, 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°C. Au/MFI catalyzes the decomposition of N2O to N2 even in the presence of 3% O2. 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.

KW - Au/MFI

KW - Gold carbonyl

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