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Role of tungsten modifiers in bimetallic catalysts for enhanced hydrodeoxygenation activity and selectivity

机译：钨修饰符在双金属催化剂为增强hydrodeoxygenation活动和选择性

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摘要

Bimetallic catalysts consisting of a noble metal and an oxophilic modifier have shown promise for upgrading lignin-derived molecules through hydrodeoxygenation (HDO). However, the mechanism of cooperation between the metals is not well understood currently. In this study, we investigated the HDO of gas-phase benzyl alcohol on W-modified Pt/Al2O3 catalysts. Our results show that bimetallic catalysts with an intermediate W loading have enhanced activity and selectivity for HDO compared to a baseline, monometallic Pt/Al2O3 catalyst. Characterization of the active site through CO chemisorption and CO diffuse-reflectance infrared spectroscopy suggests that decarbonylation is suppressed on bimetallic catalysts through site blocking and electronic effects. Based on results from X-ray photoelectron spectroscopy and titration with bases, enhancements in HDO activity were attributed to new active sites in the form of Bronsted acid centers on partially reduced WOx generated through a bifunctional H-2 spillover interaction with Pt.
机译：双金属催化剂组成的贵金属和一个前景oxophilic修饰符显示升级lignin-derived分子通过hydrodeoxygenation (HDO)。金属之间的合作不是很好理解目前。气相苯甲醇的HDO调查W-modified Pt /氧化铝催化剂。表明,双金属催化剂的中间W装载活动和增强选择性的HDO与基线相比,单本位制的Pt /氧化铝催化剂。通过化学吸收作用和活跃的站点公司漫反射率红外光谱学表明脱羰作用是抑制通过网站屏蔽,双金属催化剂电子效应。光电子能谱和滴定基地,增强HDO活动归因于新活动网站的形式布仑斯惕酸中心部分WOx减少通过双功能生成2溢出与Pt的交互。

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