MgO Modified Binder-free ZSM-5 Catalyst and Its Catalytic Performance for Benzene Alkylation with Ethylene
1.School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;
2. State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, Shanghai Research Institute of Petrochemical Technology, SINOPEC, Shanghai 201208, China;
3.College of Chemical Science and Engineering, Tongji University, Shanghai 200092, China
Abstract：The typed binder-free ZSM-5 catalyst synthesized by the gas-phase re-crystallization method was modified by MgO via impregnation. Its physicochemical properties, as well as acidic properties, were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), N2 adsorption, NH3 temperature programmed desorption (NH3-TPD), etc. Their catalytic performances were tested by benzene alkylation with ethylene to ethylbenzene (EB), in which para-diethylbenzene (p-DEB) was produced as another main product. The effects of silica-binder and MgO on the reactivity, shape selectivity and stability were investigated. It was found that MgO might not only passivate the acid sites on ZSM-5’s external surface but also enter the internal pore system. As a result, the amount and strength of the acid sites were reduced. Because these modification effects were even better when binder-free ZSM-5 was used as the substrate, the MgO modified binder-free ZSM-5 showed higher reactivity and para-DEB shape selectivity in benzene alkylation with ethylene than the MgO modified ZSM-5 containing a silica binder. Moreover, the MgO modified binder-free ZSM-5 was much more stable due to its feature with its abundant micropores-mesopores and proper acidity.
MA Chongwei1,2,SHEN Zhenhao2 et al. MgO Modified Binder-free ZSM-5 Catalyst and Its Catalytic Performance for Benzene Alkylation with Ethylene[J]. 化学反应工程与工艺, 2020, 36(4): 289-296.
