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Alkylation of Benzene with Long Chain Olefins over PW/MCM-41

Deng Wei, Jin Yingjie, Ren Jie (Department of Petrochemical Technology, Fushun Petroleum Institute, Liaoning Fushun 113001, China)  
New solid acid catalysts, consisting of heteropoly acid H 3PW 12 O 40 (PW) and supported on a mesoporous molecular sieve MCM-41, have been prepared, and characterized by X-ray diffraction, ammonia temperature programmed desorption, nitrogen physisorption techniques. For the alkylation of benzene with 1-dodecene, the PW/MCM-41 composition with various PW loads has been investigated and compared with HY zeolite about the effect of the composition, acidity and pore structure on their catalytic performance. The PW/MCM-41 catalysts with PW load of 10%~50%(wt) have stronger acidity and size-uniformed mesopores because MCM-41 frameworks has been mostly kept and the heteropoly acid dispersed uniformly on the MCM-41 surface. The alkylation performance of the PW/MCM-41 compositions can be effectively controlled by modulating PW loads and pretreating temperature. As compared to HY zeolite, the typical mesoporous catalyst with PW loads of 50 wt% exhibits not only much higher catalytic activity, stability and selectivity towards linear alkylbenzenes but also reasonable isomer distributions of phenyl dodecance than that of HY zeolite in the alkylation reaction.
【CateGory Index】: O643.3
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