Release Time:2019-03-11  Hits:

Indexed by: Journal Article

Date of Publication: 2010-02-01

Journal: 12th Asia-Pacific-Confederation-of-Chemical-Engineering (APCChE 2008)

Included Journals: Scopus、CPCI-S、EI、SCIE

Volume: 156

Issue: 3

Page Number: 532-539

ISSN: 1385-8947

Key Words: Hydrogen peroxide; Direct synthesis; Gold catalyst; TS-1; Active species

Abstract: 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.