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Indexed by:期刊论文

Date of Publication:2009-09-01

Journal:ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING

Included Journals:SCIE、EI、Scopus

Volume:4

Issue:5,SI

Page Number:602-606

ISSN No.:1932-2143

Key Words:ESR; gold nanoparticle; Au(II) complex; NaY zeolite

Abstract:Electron spin resonance (ESR) spectroscopy was used to study the anchoring of a Au complex and gold nanoparticles in NaY type zeolites. The complex of Au(II) with two nitrogen atoms of two ethylenediamine ligands [g(iso) = 2.053, A (Au) = 16.4 G, A (N) = 15.0 G.] in the supercage of the zeolite and conduction electron spin resonance (CESR) of gold particles with 1.56-nm diameter (g = 2.064) were observed. Their formation and stability were related with the gold concentration and the pre-treatment conditions. The small gold particles stabilized in the supercage of zeolite were formed in the samples with low gold concentration after oxygen pre-treatment. The confinement in the zeolite pores obviously prevents the Au(II) complex bound to two nitrogen ligands from undergoing disproportionation. (C) 2009 Curtin University of Technology and John Wiley & Sons, Ltd.