水对两段法合成汽油中HZSM-5分子筛稳定性及油相产物的影响  

Effect of water on stability of HZSM-5 and product distribution in two-stage gasoline synthesis from syngas

作　　者：李剑[1,2] 谭猗生[1] 杨彩虹[1] 韩怡卓[1] 

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西太原030001 [2]中国科学院研究生院,北京100049

出　　处：《燃料化学学报》2010年第1期96-101,共6页Journal of Fuel Chemistry and Technology

基　　金：中国科学院知识创新工程重要方向项目(KGCX2-YW-318-2);中国科学院海外基金(2005-2-4);太原市科技局明星项目

摘　　要：模拟两段法合成汽油工艺的反应条件(360℃、2 MPa),通过控制甲醇的脱水量或在该气氛下对HZSM-5进行水热预处理,考察了水对催化剂稳定性及油相产物的影响。XRD、BET、FT-IR、SEM和NH3-TPD等表征手段表明水热预处理后的分子筛具有晶粒小、中孔多和酸强度低等特点,能显著提高汽油收率和异构烷烃选择性。甲醇在HZSM-5分子筛上发生脱水反应,产生的水热气氛造成强酸中心失活。The effects of water on the stability of the catalyst and the product distribution were investigated through controlling the amount of water dehydrated from methanol or using HZSM-5 pretreated by hydrothermal method at the analogous atmosphere of gasoline synthesis in two-stage process（360℃,2MPa）.Physicochemical properties of the zeolite were characterized by XRD,BET,FT-IR,SEM,and NH3-TPD.The results showed that HZSM-5 pretreated by hydrothermal method had smaller crystal size,more mesoporous,and moderate acid sites,which in all result in the enhancement of gasoline yield and the selectivity to iso-paraffins.The steam generated during methanol dehydration led to the deactivation of strong acid over HZSM-5 zeolite.

关 键 词：水 HZSM-5分子筛 两段法合成汽油 异构烷烃 

分 类 号：O643[理学—物理化学]