2002•Journal of Beijing University of Chemical TechnologyRequires access
Effects of acidity and pore structure of catalysts on the activity and product distribution in cumene disproportionation
Junchun Li, Xue Duan
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Abstract
Cumene disproportionation was studied over zeolites and layered catalysts. The results show that both the acidities and pore structures have great effects on the activities of catalysts and the product distribution in cumene disproportionation. Hβ has greater acidity than HY, and Hβ obtains higher disproportionation conversion than HY. Compared with Hβ and HY, HZSM-5 has the greatest acidity and the smallest pore opening which results in its different mechanism from Hβ and HY, and its activity in cumene disproportionation is lower than Hβand HY. The acidities of MCM-41 and layered catalysts α-ZrP、α-ZrP/Al-Cr, Zr(SO4)2·4H2O and Zr(SO4)2·4H2O/SiO2 are lower than that of HfKHY and HZSM-5, thus their activities are very low. The formation of diisopropylbenzene(DIPB) is highly shape-selective. The larger the pore openings of zeotites and layered structure catalysts, the greater the molar ratio of m-iiPB to p-iiPB, i. e. Rm/p·