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论文类型：期刊论文

发表时间：2010-02-01

发表刊物：12th Asia-Pacific-Confederation-of-Chemical-Engineering (APCChE 2008)

收录刊物：SCIE、EI、CPCI-S、Scopus

卷号：156

期号：3

页面范围：532-539

ISSN号：1385-8947

关键字：Hydrogen peroxide; Direct synthesis; Gold catalyst; TS-1; Active species

摘要：Direct synthesis of hydrogen peroxide from H-2 and O-2 was performed over supported gold catalysts. The catalysts were characterized by means of UV-vis, H-2-TPR, TEM and XPS. Based on the results we conclude that metallic Au is the active species in the direct synthesis of hydrogen peroxide from H-2 and O-2. During preparation process of catalyst by deposition-precipitation with urea, the pH value increased and the gold particle size decreased with increasing the urea concentration. The catalyst prepared with higher urea concentration showed a higher activity and its stability also was efficiently improved. Gold nanoparticles, supported on TiO2 or Ti contained supports, gave a higher catalytic activity. Thiophene can be efficiently oxidized by hydrogen peroxide synthesized in situ from H-2 and O-2 over Au/TS-1. (C) 2009 Elsevier B.V. All rights reserved.