Zinc modification of Ni-Ti as efficient Ni_(x)Zn_(y)Ti_(1)catalysts with both geometric and electronic improvements for hydrogenation of nitroaromatics  

作　　者：Pingle Liu Yu Liu Yang Lv Wei Xiong Fang Hao Hean Luo 

机构地区：[1]College of Chemical Engineering,National&Local United Engineering Research Center for Chemical Process Simulation and Intensification,Xiangtan University,Xiangtan 411105,China

出　　处：《Frontiers of Chemical Science and Engineering》2022年第4期461-474,共14页化学科学与工程前沿（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.22078277,21908185);Project of Hunan Provincial Education Department(Grant Nos.19B572,20B547);the Collaborative Innovation Center of New Chemical Technolo gies Technolo gies for Environmental Benignity and Efficient Resource Utilization,and the National Department of Education Engineering Research Centre for Chemical Process Simulation and Optimization。

摘　　要：The catalytic hydrogenation of nitroaromatics is an environmentally friendly technology for aniline production,and it is crucial to develop noble-metal-free catalysts that can achieve chemoselective hydrogenation of nitroaromatics under mild reaction conditions.In this work,zinc-modified Ni-Ti catalysts(Ni_(x)Zn_(y)Ti_(1))were fabricated and applied for the hydrogenation of nitroaromatics hydrogenation.It was found that the introduction of zinc effectively increases the surface Ni density,enhances the electronic effect,and improves the interaction between Ni and TiO_(2),resulting in smaller Ni particle size,more oxygen vacancies,higher dispersion and greater concentration of Ni on the catalyst surface.Furthermore,the electron-rich Ni^(δ-) obtained by electron transfer from Zn and Ti to Ni effectively adsorbs and dissociates hydrogen.The results reveal that Ni_(x)Zn_(y)Ti_(1)(Ni_(0.5)Zn_(0.5)Ti_(1))shows excellent catalytic performance under mild conditions(70℃and 6 bar).These findings provide a rational strategy for the development of highly active non-noble-metal hydrogenation catalysts.

关 键 词：bimetal strategy oxygen vacancy non-noble metal catalyst HYDROGENATION aromatic nitro compounds 

分 类 号：O64[理学—物理化学]