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论文类型：期刊论文

发表时间：2009-09-01

发表刊物：ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING

收录刊物：SCIE、EI、Scopus

卷号：4

期号：5,SI

页面范围：602-606

ISSN号：1932-2143

关键字：ESR; gold nanoparticle; Au(II) complex; NaY zeolite

摘要：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.