纳米HZSM-5沸石酸度的调节及对液化气裂解反应的影响  

Tailoring the Acidity of Nano-sized HZSM-5 Zeolite and Its Effect on the Catalytic Cracking of LPG

作　　者：贾文浩[1] 徐瑞芳[1] 李福芬[1] 马安 陈黎行[1] 郭洪臣[1] 

机构地区：[1]大连理工大学化工学院工业催化系,辽宁大连116012 [2]中国石油大连石油化工公司,辽宁大连116032

出　　处：《分子催化》2009年第1期11-16,共6页Journal of Molecular Catalysis(China)

基　　金：辽宁省优秀青年科技人才培养基金(2005222010)资助项目

摘　　要：通过对纳米HZSM-5沸石进行钠离子浸渍改性和在小型常压固定床反应器中开展碳四液化气催化裂解制丙烯反应研究,探讨了催化剂酸度对反应选择性的影响.结果表明,钠离子改性能够选择性地去除纳米HZSM-5沸石表面的强酸中心,而对弱酸中心则基本无影响.在用钠离子改性基本上消除催化剂强酸中心的情况下,混合碳四液化气的催化裂解反应主要发生在丁烯分子上,丙烯的最高选择性可达60%,丙烯和乙烯的总选择性可达80%.By impregnating sodium ion onto nano-sized HZSM-5 zeolite and carrying out the catalytic cracking of C4 liquefied petroleum gas （LPG） over the modified catalysts in a small fixed-bed reactor, the effect of catalyst acidity on the selectivity of the catalytic cracking was investigated. Results show that, impregnating with sodium ions can selectively eliminate the strong acid sites of the nano-sized zeolite. In the condition of all the strong acid sites of the nano-sized zeolite being killed by sodium ions, only butenes in the C4 LPG undergo catalytic cracking, which gives the highest propytene selectivity of about 60%. The total selectivity to ethylene and propylene amounts to about 80%.

关 键 词：纳米HZSM-5沸石 钠改性 液化气 丙烯 酸度 

分 类 号：O643.32[理学—物理化学]