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Titolo:
Characterization and catalytic tests of Au/MFI prepared by sublimation of AuCl3 onto HMFI
Autore:
Gao, ZX; Sun, Q; Chen, HY; Wang, X; Sachtler, WMH;
Indirizzi:
Northwestern Univ, Dept Chem, VN Ipatieff Lab, Ctr Catalysis & Surface Sci, Evanston, IL 60208 USA Northwestern Univ Evanston IL USA 60208 rface Sci, Evanston, IL 60208 USA
Titolo Testata:
CATALYSIS LETTERS
fascicolo: 1-2, volume: 72, anno: 2001,
pagine: 1 - 5
SICI:
1011-372X(2001)72:1-2<1:CACTOA>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
REFLECTANCE IR SPECTROSCOPY; SELECTIVE REDUCTION; ZEOLITE CATALYSTS; CARBON-MONOXIDE; GOLD PARTICLES; NITRIC-OXIDE; NAY ZEOLITE; NOX; CO; HYDROGEN;
Keywords:
Au/MFI; sublimation method; gold carbonyl; NO reduction; N2O and NO decomposition;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Sachtler, WMH Northwestern Univ, Dept Chem, VN Ipatieff Lab, Ctr Catalysis& Surface Sci, 2145 Sheridan Rd, Evanston, IL 60208 USA Northwestern Univ 2145 Sheridan Rd Evanston IL USA 60208 USA
Citazione:
Z.X. Gao et al., "Characterization and catalytic tests of Au/MFI prepared by sublimation of AuCl3 onto HMFI", CATAL LETT, 72(1-2), 2001, pp. 1-5

Abstract

Au/MFI was prepared by sublimation of AuCl3 onto HMFI. The oxidation stateof 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 bandsshow 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.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/03/20 alle ore 13:21:29