ZSM-5/MAPO Composite Catalyst for Converting Methanol to Olefins in a Two-Stage Unit with a Dimethyl Ether Pre-Reactor

查看全文 作　　者：Wang [1,2,3]Lin;Wang [2]Zheng;Jiao [3]Hongqiao;Yong [3]Xiaojing;Luo [3]Chuntao;Liu [1]Dianhua

机构地区：[1]State Key Laboratory of Chemical Engineering, East China University of Science and Technology;[2]State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University;[3]Coal to Liquids Chemical Research and Development Center,Shenhua Ningxia Coal Industry Group

出　　处：《China Petroleum Processing & Petrochemical Technology》索引2018年第20卷第1期,共8页

基　　金：financially supported by the National International Cooperation S & T Project of China (No.2015DFA40660) 摘　　要：A ZSM-5/MAPO composite catalyst was prepared by adding ZSM-5 zeolite powder to a conventional molecular sieve synthesis system, followed by modification with NH_4H_2PO_4. The samples were characterized by XRD, SEM, IR, NH_3-TPD, and BET analyses. The catalytic property of the samples toward the methanol-to-olefin(MTO) reaction was evaluated in a connected in series two-stage unit equipped with a continuous flow(once-through) fixed-bed tubular reactor similar to an industrial reactor. The first reactor mainly converted methanol into dimethyl ether and water, followed by being subject to continuous reaction in the second reactor, in which DME was converted to hydrocarbons. The composites exhibited the typical framework topology of MFI, AEI and AFI, which represented the ZSM-5 zeolite, the molecular sieves AlPO-18 or SAPO-18, AlPO-5 or SAPO-5, respectively. The composites showed several advantages for optimizing the zeolite acidity, enhancing the mass transfer, and restraining the side reactions. Catalytic reaction results showed that the composites exhibited higher selectivity to light olefins(84.0%) and lower selectivity to C_2―C_4 alkanes and C_5^+ hydrocarbons than pure ZSM-5. Moreover, the composite zeolite loaded with 3% of P demonstrated improved catalytic activity and stability for the conversion of methanol to propylene, because the coking rate was obviously suppressed. 关键词：MTO composite ZEOLITE ZSM-5 ZEOLITE OLEFINS catalyst RECEIVED

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ZSM-5/MAPO Composite Catalyst for Converting Methanol to Olefins in a Two-Stage Unit with a Dimethyl Ether Pre-Reactor

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引证文献(3)

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