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论文类型：期刊论文

发表时间：2006-05-30

发表刊物：Annual Meeting of the Surface-Reactivity-and-Catalysis-Group

收录刊物：SCIE、EI、CPCI-S、Scopus

卷号：114

期号：4

页面范围：369-371

ISSN号：0920-5861

关键字：gold catalysis; hydrogen peroxides; hydrogen oxidation

摘要：The direct synthesis of hydrogen peroxide from H-2 and O-2 using zeolite-supported An catalysts is described and their activity is contrasted with silica- and alumina-supported Au catalysts. Two zeolites were investigated, ZSM-5 and zeolite Y. The effect of calcination of these catalysts is studied and it is found that for uncalcined catalysts high rates of hydrogen peroxide formation are observed, but these catalysts are unstable and lose Au during use. Consequently, reuse of these catalysts leads to lower rates of hydrogen peroxide formation. However, catalysts calcined at 400 degrees C are more stable and can be reused without loss of gold. The use of zeolites as a support for Au gives comparable rates of hydrogen peroxide formation to alumina-supported Au catalysts and higher rates when compared with silica-supported catalysts. prepared using a similar method. Zeolite Y-supported catalysts are more active than ZSM-5-supported catalysts for the stable calcined materials. It is considered that the overall activity of these supported catalysts may be related to the aluminium content as the activity increases with increasing aluminium content. (c) 2006 Elsevier B.V. All rights reserved.