Au Promotional Effects on the Synthesis of H2O2 Directly from H2 and O2 on Supported Pd-Au Alloy Catalysts

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• 作者：Yi-Fan Han ; Ziyi Zhong ; Kanaparthi Ramesh ; Fengxi Chen ; Luwei Chen ; Tim White ; Qiuling Tay ; Siti Nurbaya Yaakub ; Zhan Wang
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：June 21, 2007
• 年：2007
• 卷：111
• 期：24
• 页码：8410 - 8413
• 全文大小：99K
• 年卷期：v.111,no.24(June 21, 2007)
• ISSN：1932-7455

文摘

Supported Pd, Au, and Pd-Au alloy catalysts are characterized with in situ diffuse reflectance infrared Fouriertransform spectroscopy of CO adsorption (DRIFTS), quantitative powder X-ray diffraction, and X-rayphotoelectron spectroscopy. The spectroscopic results presented in the paper demonstrate the existence ofelectron density transfer between Pd and Au atoms in alloy surfaces. In particular, the modification of the Pdelectronic structure by the addition of Au is confirmed probably for the first time by the DRIFT spectra. Therelationship between surface composition and catalyst performance in the synthesis of hydrogen peroxidedirectly from hydrogen and oxygen was established. Preliminary results indicate that the activity and selectivityof Pd-Au alloy catalysts can be significantly enhanced through adjusting the surface structures by changingthe Au content in alloys.