High CO2 Selectivity of ZnO Powder Catalysts for Methanol Steam Reforming

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• 作者：Barr Halevi ; Sen Lin ; Aaron Roy ; He Zhang ; Ese Jeroro ; John Vohs ; Yong Wang ; Hua Guo ; Abhaya K. Datye
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：April 4, 2013
• 年：2013
• 卷：117
• 期：13
• 页码：6493-6503
• 全文大小：563K
• 年卷期：v.117,no.13(April 4, 2013)
• ISSN：1932-7455

文摘

To investigate the contribution of the ZnO supports in PdZn/ZnO catalysts used for methanol steam re-forming (MSR), we have investigated methanol steam re-forming on two different ZnO powder samples. The powder samples included a commercial powder with both polar and nonpolar surfaces exposed, and a plate-like sample preferentially exposing the polar ZnO(001)/ (001虆) surfaces. ZnO was found to be active and selective for MSR, with the polar surfaces being most active, but the activation energy for reaction (100 kJ/mol) was much larger than on unsupported PdZn(50 kJ/mol) or PdZn/ZnO. The experimental findings are supported by DFT calculations on key elementary steps and reaction intermediates on the ZnO(001) surface. We conclude that the contribution of the ZnO support to the MSR activity PdZn/ZnO catalyst system may not be very significant.