Effect of support composition on the structural and catalytic properties of Ru/AlOOH-SiO2 catalysts for benzene selective hydrogenation

Zhou Gongbing; Dong Yanlu; Jiang LanHe DaipingYang YaZhou Xin

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Effect of support composition on the structural and catalytic properties of Ru/AlOOH-SiO2 catalysts for benzene selective hydrogenation

机译：支持对结构组成的影响和催化性能的俄文/ AlOOH-SiO2苯选择性加氢催化剂

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Benzene selective hydrogenation to cyclohexene, which has been attracting attention in terms of atomic economy, feedstock accessibility, and operational facilitation, has been investigated on Ru catalysts supported on AlOOH-SiO2 composites with varying Al/Si ratios aiming at unveiling the effect of support acidity. Various techniques such as Fourier transform infrared spectroscopy of adsorbed pyridine, transmission electron microscopy, and extended X-ray absorption fine structure spectroscopy were employed to comprehensively characterize the catalysts. It is confirmed that the amount of Lewis acid sites increased steadily with the increase in the Al/Si molar ratio. In benzene selective hydrogenation, the turnover frequency of benzene linearly correlated with the amount of acid sites, while the cyclohexene selectivity showed a volcano-type trend, achieving a maximum of 81%. Kinetic investigation revealed that the Lewis acid sites promoted the rate constants of both the benzene hydrogenation and cyclohexene hydrogenation steps to inequable extents. The resulting ratios of the rate constants evolved parallel to the variation in the cyclohexene selectivity, which elucidated the volcano-type relationship between the cyclohexene selectivity and the amount of Lewis acid sites.

机译：苯选择性加氢环己烯,已吸引注意力的原子经济、原料可访问性操作便利,已被调查在AlOOH-SiO2俄文催化剂支持上复合材料在不同铝/ Si比率针对推出支持酸度的影响。傅里叶变换红外等技术光谱学的吸附吡啶,传播电子显微镜,x射线吸收精细结构光谱用来全面描述催化剂。路易斯酸稳步增长的网站增加铝/ Si摩尔比率。选择性加氢,周转频率苯与量的线性相关酸的网站,而环己烯选择性显示volcano-type趋势,达到最大的81%。路易斯酸网站推广的速率常数苯加氢和环己烯加氢步骤不一样的区段。产生的进化速率常数的比率平行于环己烯的变异选择性,阐明volcano-type环己烯的选择性之间的关系和路易斯酸的网站。

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来源
《Catalysis science & technology》 |2018年第5期|1435-1446|共12页
作者
Zhou Gongbing; Dong Yanlu; Jiang LanHe DaipingYang YaZhou Xin;
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作者单位

Chongqing Normal Univ, Coll Chem, Chongqing Key Lab Inorgan Funct Mat, Key Lab Green Synth & Applicat, Chongqing 401331, Peoples R China;

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正文语种英语
中图分类汉语教学;
关键词
RATE CONSTANT; cyclohexenes; Lewis acidsCatalystsFourier transform infrared spectroscopyBenzenesHydrogenationturnover frequency;

机译：acidsCatalystsFourier变换红外spectroscopyBenzenesHydrogenationturnover频率;

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Effect of support composition on the structural and catalytic properties of Ru/AlOOH-SiO2 catalysts for benzene selective hydrogenation

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