Improved activity of Ni-Mo/SiO_(2) bimetallic catalyst synthesized via sol-gel method for methylcyclohexane cracking  

作　　者：Jun Zhang Ting Chen Yi Jiao Mei Cheng Lin-Lin Wang Jian-Li Wang Xiang-Yuan Li Yao-Qiang Chen 

机构地区：[1]School of Chemical Engineering,Sichuan University,Chengdu,610064,Sichuan,China [2]Institute of New Energy and Low-Carbon Technology,Sichuan University,Chengdu,610064,Sichuan,China [3]College of Chemistry,Sichuan University,Chengdu,610064,Sichuan,China

出　　处：《Petroleum Science》2021年第5期1530-1542,共13页石油科学（英文版）

基　　金：supported by National Natural Science Foundation of China [grant number 91841301];Fundamental Research Funds for the Central Universities [grant number YJ201791]。

摘　　要：To improve the cracking behavior of hydrocarbon,Ni-Mo/SiO_(2) bimetallic catalysts were synthesized by different preparation methods(sol-gel,co-impregnation and single-impregnation) and added the additives(citric acid,polyethylene glycol and cetyltrimethylammonium bromide) based on the most suitable method above.The cracking reaction of methylcyclohexane under supercritical conditions was performed as the probe reaction to estimate the catalytic performance,and the properties of Ni-Mo/SiO_(2) catalyst were characterized by N_(2) absorption-desorption,XRD,XPS,H_(2)-TPR,NH_(3)-TPD,in-situ IR of NH_(3) desorption,HRTEM and STEM-mapping so as to study the structure-activity relationship.The catalyst synthesized via sol-gel method showed the best conversion and heat sink,being 81.8% and 3.81 MJ/kg,which was closely related to strong mutual effect between active components and SiO_(2) as well as strong acid sites.Besides,the introduction of additives by sol-gel method has an affirmative influence on properties of Ni-Mo/SiO_(2) catalysts,being that the acidity(more L and B acid sites) was modulated and organic groups interact with metal to suppress the aggregation of metal species(Ni and Mo),thereby enhancing the catalytic activity.At 750℃,the conversion(89.3%) as well as heat sink(3.99 MJ/kg) of MCH cracking obtained an optimum over Ni-Mo/SiO_(2) catalyst with addition of citric acid.

关 键 词：Ni dispersion Ni-Mo/SiO_(2) Catalytic cracking Citric acid Sol-gel method Acidity modulation 

分 类 号：TE624.91[石油与天然气工程—油气加工工程]