MCM-22分子筛的酸性及在1-丁烯骨架异构化反应中的催化性能  

Acidity of MCM-22 Zeolites and Their Catalytic Performance for the Skeletal Isomerization of 1-Butene

作　　者：商永臣[1,2] 张文祥[1] 贾明君[1] 潘维成[1] 蒋大振[1] 吴通好[1] 

机构地区：[1]吉林大学化学学院 [2]哈尔滨师范大学化学系,黑龙江哈尔滨150080

出　　处：《催化学报》2005年第6期517-520,共4页

基　　金：国家自然科学基金(20273025);黑龙江省教育厅资助项目(10531083)

摘　　要：采用XRD,NH3-TPD及氘代乙腈吸附FT-IR等技术表征了静态水热合成法合成的MCM-22分子筛的晶相结构和酸性.根据表征结果,Si/Al比为15和30的两个样品均为高纯度的MCM-22分子筛;两个样品的Br¨onsted酸量基本相同,但Si/Al为15的样品上含有相对较高的Lewis酸量.MCM-22分子筛上1-丁烯骨架异构化反应的结果表明,Si/Al为30的样品具有较高的异丁烯选择性(74·8%)和稳定性,而Si/Al为15的样品中存在的含量较高的Lewis酸位可能是导致异丁烯选择性(65·5%)下降的主要原因.MCM-22 zeolite samples with Si/Al molar ratios of 15 and 30 (denoted as MCM-22-15 and MCM-22-30, respectively) were synthesized by the hydrothermal method under static condition, and characterized by means of XRD, NH3-TPD and FT-IR. Quantitative analysis of adsorbed d(3)-acetonitrilc on MCM-22 by IR spectra indicated that the concentration of Bronsted sites in these two samples was at the same level, while the concentration of Lewis acid sites in MCM-22-15 was higher than that of MCM-22-30. Both the two samples were active and selective for the skeletal isomerization of 1-butene. The MCM-22-15 sample showed relatively lower selectivity for isobutene (65.5 %) than that of MCM-22-30 (74.8 %), which might be explained by the happening of undesired side reactions when the density of Lewis sites increased in MCM-22-15.

关 键 词：MCM-22分子筛 丁烯 骨架异构化 异丁烯 氘代乙腈吸附 

分 类 号：O643.361[理学—物理化学]