Insights into Activated Carbon-Supported Platinum Catalysts for Base-Free Oxidation of Glycerol

详细信息    查看全文

• 作者：Jiaqi Lei ; Hua Dong ; Xuezhi Duan ; Wenyao Chen ; Gang Qian ; De Chen ; Xinggui Zhou
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：January 20, 2016
• 年：2016
• 卷：55
• 期：2
• 页码：420-427
• 全文大小：451K
• ISSN：1520-5045

文摘

Two kinds of activated carbon (AC)-supported Pt catalysts with similar particle sizes were respectively synthesized using the polyol method and incipient wetness impregnation method, and then tested for glycerol oxidation in a base-free condition. It is revealed that the initial reaction rate on the Pt catalyst prepared by the polyol method (Pt/AC_PO) is nearly triple that on the Pt catalyst prepared by incipient wetness impregnation method (Pt/AC_IWI), and the Pt/AC_IWI catalyst favors further oxidation of glyceraldehyde to glyceric acid and more C–C bond cleavage, which might mainly arise from the difference in relative coverage of oxygen to glycerol caused by the different electronic properties of Pt as well as the difference in the catalyst surface properties. Moreover, the deactivation mechanisms of both catalysts were also investigated. The results show that strongly adsorbed intermediates contribute significantly to the deactivation of the Pt/AC_PO catalyst, while both the oxygen poison and the adsorption of intermediates on Pt surfaces cause the deactivation of the Pt/AC_IWI catalyst.