改性分子筛催化缩醛酮反应性能研究  

STUDY ON CATALYSIS OF MODIFIED MOLECULAR SIEVE FOR KETAL/ACETAL REACTION

作　　者：程栖桐 王姗姗[1] 梁馨月[2] 张黎[1] 张洁[1] 汤颖[1] 

机构地区：[1]西安石油大学化学化工学院,陕西西安710065 [2]陕西师范大学材料科学学院,陕西西安710062

出　　处：《精细石油化工》2014年第4期30-33,共4页Speciality Petrochemicals

基　　金：国家自然科学基金项目(21306149);陕西省教育厅科研计划项目(2013JK0646);西安石油大学研究生创新基金项目(2013cx120735)

摘　　要：以三甲基氯硅烷为改性剂,利用化学键合的方法对分子筛表面进行改性,考察了改性剂用量等因素对环己酮与正丁醇反应产率的影响.结果表明：表面改性能够显著提高分子筛对缩醛酮反应的性能,采用3 mg/g三甲基氯硅烷改性后的ZSM-5分子筛,在催化剂用量0.20g、醇与醛（酮）摩尔比为1.2、回流速度为2-3滴/s及反应时间4h的条件下催化合成缩醛（酮）,产率从未改性前的26.7％提高到89.2％;改性催化剂比表面积有所提高,表面亲油性增强,能够促进反应物向催化剂表面的扩散,但改性过程未对ZSM-5分子筛的孔径分布、粒径分布产生影响.The molecular sieve is modified by bonding trimethylchlorosilane on its surface chemically and the effect of dosage of modifier on yield of cyclohexanone and N-butyl alcohol is investigated in de- tail. The results showed that the catalytic performance of molecular sieve was greatly improved after modifying. The yield of acelalization was improved from 26. 7% to 89.2% when 3 mg/g trimethylchlorosilane was used as modifier, molar ratio of butanol to cyclohexanoe was 1.2 ： 1, backflow velocity was 2 - 3 drops per second and catalyst dosage was 0.2 g after 4 h. In addition, the BET and surface lipophilicity of molecular sieve are increased after modification without significantly change of the pore size distribution and particle size

关 键 词：ZSM-5分子筛 环己酮 正丁醇 缩醛(酮) 三甲基氯硅烷 

分 类 号：O643.36[理学—物理化学] TQ224.7[理学—化学]