ITQ-13分子筛的表面改性及其丁烯催化裂解性能  

CATALYTIC PERFORMANCES OF SURFACE MODIFIED ITQ-13 ZEOLITES IN BUTENE CRACKING

作　　者：许国梁[1,2] 朱向学[1] 刘盛林[1] 谢素娟[1] 徐龙伢[1] 

机构地区：[1]中国科学院大连化学物理研究所,辽宁大连116023 [2]中国科学院研究生院,北京100049

出　　处：《石油学报（石油加工）》2009年第A02期28-31,共4页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金(20773120);国家重大基础研究"973"项目(2009CB623501)资助

摘　　要：采用正硅酸乙酯(TEOS)为硅烷化试剂对ITQ-13分子筛催化剂进行了表面改性,对改性前后的催化剂进行了XRD、XRF、N2吸附和NH3-TPD等表征。结果表明,TEOS表面改性可有效覆盖ITQ-13催化剂的外表面和中孔内的酸性中心,多次改性还可造成部分微孔孔口的堵塞。改性的ITQ-13催化剂催化丁烯裂解反应具有高的转化率和丙烯选择性。催化剂的催化性能与其酸性和表面性质具有良好的对应关系。Surface modification of ITQ-13 zeolite was carried out by using tetraethyl orthosilicate （TEOS） as a modifying agent. The ITQ-13 catalysts were characterized by XRD, XRF, N2 adsorption-desorption and NH3-TPD techniques. The acid sites on the outer surface as well as those inside the mesopores of surface modified ITQ-13 zeolite were partially covered by SiO2 formed by decomposition of deposited TEOS, and part of micropore mouths could be blocked by multi-cycle modification. The surface modified ITQ-13 catalysts exhibited better performance for enhancing the production of propene in butene cracking process. The catalytic performance of the surface modified ITQ-13 was well correlated with its acidity and surface properties.

关 键 词：ITQ-13 表面改性 催化裂解 丁烯 丙烯 

分 类 号：O643[理学—物理化学]