Selective Hydrogenation of Polycyclic Aromatics to Monocyclic Aromatics over NiMoC/HβCatalysts in a Methane and Hydrogen Environment  

作　　者：Shen Zhibing Fu Rao Zhang Shangli Wang Shunmei Zhang Wu Tang Ruiyuan Liang Shengrong Zhang Juntao Yuan Shibao Jiang Haiyan 

机构地区：[1]Xi’an Key Laboratory of Low-carbon Utilization for High-carbon Resources,College of Chemistry and Chemical Engineering,Xi’an Shiyou University,Xi’an,Shaanxi 710065,China [2]Shaanxi Engineering Research Center of Green Low-carbon Energy Materials and Processes,Xi’an Shiyou University,Xi’an,Shaanxi 710065,China [3]College of Petroleum Engineering,Xi’an Shiyou University,Xi’an,Shaanxi 710065,China

出　　处：《China Petroleum Processing & Petrochemical Technology》2023年第2期92-100,共9页中国炼油与石油化工（英文版）

基　　金：the financial support from the Graduate Student Innovation and Practical Ability Training Program of Xi’an Shiyou University (No. YCS21212111);Open Fund Project of the State Key Laboratory of Heavy Oil, China (SKLHOP201703);National Natural Science Foundation of China (No. 52274039);Natural Science Foundation of Shaanxi Provincial Department of Education (Grant 2023-JC-YB-414);Natural Science Foundation of Shaanxi Province in China (No. 2022JZ-28);the Open Fund Project of the National Oil Shale Exploitation Research and Development Center, China (No. 33550022-ZC0613-0255)

摘　　要：To obtain high yields of monocyclic aromatic hydrocarbons with methyl side chains,such as toluene and xylene,methane(CH_(4))can be introduced into the hydrocracking of polycyclic aromatic hydrocarbons.CH_(4)can participate in the reaction,supply methyl side chains to the product,and improve product distribution.In this study,the hydrogenation reaction of polycyclic aromatic hydrocarbons over a carbonized NiMo/Hβcatalyst in a CH_(4)and hydrogen(H_(2))environment was investigated to study the promotional effect of CH_(4)on the hydrocracking of polycyclic aromatics.Under conditions of 3.5 MPa,380℃,volume air velocity of 4 h^(-1),gas-oil volume ratio of 800,and H_(2):CH_(4)molar ratio of 1:1,the conversion rate of naphthalene was 99.97%,the liquid phase yield was 93.62%,and the selectivity of BTX were 17.76%,25.17%,and 20.47%,respectively.In comparison to the use of a H_(2)atmosphere,the selectivity of benzene was significantly decreased,whereas the selectivity of toluene and xylene were increased.It was shown that CH_(4)can participate in the hydrocracking of naphthalene and improve the selectivity of toluene and xylene in the liquid product.The carbonized NiMo/Hβcatalyst was characterized by a range of analytical methods(such as X-ray diffraction(XRD),ammonia-temperature-programmed desorption(NH3-TPD),hydrogen-temperature-programmed reduction(H_(2)-TPR),and X-ray photoelectron spectroscopy(XPS)).The results indicated that Ni and Mo carbides were the major species in the carbonized NiMo/Hβcatalyst and were considered to be active sites for the activation of CH_(4)and H_(2).After loading the metal components,the catalyst displayed prominent weak acidic sites,which may be suitable locations for cracking,alkylation,and other related reactions.Therefore,the carbonized NiMo/Hβcatalyst displayed multiple functions during the hydrocracking of polycyclic aromatic hydrocarbons in a CH_(4)and H_(2)environment.These results could be used to develop a new way to efficiently utilize polycyclic aromatic hydrocarbons and nat

关 键 词：methane polycyclic aromatic hydrocarbons HYDROCRACKING NiMoC/Hβ TOLUENE XYLENE 

分 类 号：TQ241[化学工程—有机化工] TQ426