石油化工2012，Vol.41Issue(5)：520-528,9.
乙醇制丙烯反应热力学及HZSM-5/SAPO-34复合分子筛的催化性能
Thermodynamics of Preparation of Propylene from Ethanol and the HZSM-5/SAPO-34 Composite Zeolite Catalysts
摘要
Abstract
The reaction heats, changes of Gibbs free energy and equilibrium constants of the reactions in preparation of propylene from ethanol were calculated by equilibrium constant method. Thermodynamic equilibrium composition of the products under different reaction temperature(7) and ethanol partial pressure(p(ethanol)) was estimated. The thermodynamic calculation results indicated that low T and/or high p(ethanol) were beneficial to increasing propylene content in the equilibrium composition. The preparation of propylene from ethanol over HZSM-5/SAPO-34 composite catalysts with different HZSM-5/SAPO-34 mass ratio was carried under different T and p(ethanol). The result was different from that obtained by the thermodynamic calculation, possibly due to the ignored acid catalysis in the thermodynamic calculation. The concentration and strength distribution of the acid sites on the catalyst were close relative to its activity. The propylene yield could be 34.5% under the optimal conditions of HZSM-5/SAPO-34 mass ratio in the catalyst 4, 773 K and p(ethanol) 0.020 MPa, owing to the catalyst's moderate concentration and strength distribution of the acid sites.关键词
乙醇/丙烯/热力学/HZSM-5/SAPO-34复合分子筛催化剂Key words
ethanol/ propylene/ thermodynamics/ HZSM-5/SAPO-34 composite zeolite catalyst分类
化学化工引用本文复制引用
张莉,段超,张昕,鬲春利,程杰..乙醇制丙烯反应热力学及HZSM-5/SAPO-34复合分子筛的催化性能[J].石油化工,2012,41(5):520-528,9.基金项目
教育部新世纪优秀人才支持计划(NCET-10-878) （NCET-10-878）
教育部博士点新教师基金项目(20096101120018) （20096101120018）
陕西省"13115"创新工程重大科技专项(2009ZDKG-70) （2009ZDKG-70）
化工资源利用国家重点实验室开放课题(CRE-2011-C-304). （CRE-2011-C-304）
