YU Lou-yun, XUE Bing, XU Jie, LI Yong-xin*
(Institute of Petrochemical Technology, Changzhou University, Changzhou 213164, China)
Abstract: A series of MgO/HMCM-22 catalysts prepared by wet impregnation method have been tested for the synthesis of p-diethylbenzene (p-DEB) by the alkylation of ethylbenzene (EB) with diethyl carbonate (DEC) using a fix-bed reactor. Several techniques such as X-ray diffraction, NH3-TPD, and pyridine-IR were applied to characterize the structure and acidic properties of the as-synthesized catalysts. By analysis of results of the characterization, the alkylation of EB with DEC occurred mainly on Brønsted acid sites. Furthermore, the effects of MgO loading amount, reaction temperature, and the ratio of EB to DEC on the catalytic performance have been investigated. Catalytic tests demonstrated that, with the increase of the loading amount MgO, the conversion of EB decreased while the selectivity to p-DEB increased dramatically. The best catalytic performance was obtained over the 12%MgO/HMCM-22 catalyst under 360 ℃ with a ratio of EB to DEC of 1:2, affording a remarkable p-DEB selectivity (64.4%).
Key words: MCM-22 zeolite; MgO; ethylbenzene; diethyl carbonate; para-diethylbenzene
E-mail: liyx@cczu.edu.cn
Journal of Molecular Catalysis, Vol. 25, Issue 1, 2011, 59~63.
