La和KF改性Y型分子筛催化丙烯醛二乙缩醛/氨合成吡啶和3-甲基吡啶  

Synthesis of Pyridine and 3-Picoline from Acrolein Diethyl Acetal and Ammonia over La-and KF-modified Y Type Zeolite Catalysts

作　　者：罗才武[1,2] 赵勇 蒋复量[1,2] 李向阳 晁自胜[3] LUO Caiwu;ZHAO Yong;JIANG Fuliang;LI Xiangyang;CHAO Zisheng(School of Environmental and Safety Engineering, University of South China, Hengyang, Hunan 421001, China;Hunan Engineering Research Center for Uranium Tailings Decommission and Treatment, Hengy ang , Hunan 421001, China;College of Materials Science and Engineering, Changsha University of Science ＆ Technology, Changsha 410114, China)

机构地区：[1]南华大学环境与安全工程学院,湖南衡阳421001 [2]湖南省铀尾矿库退役治理工程技术研究中心,湖南衡阳421001 [3]长沙理工大学材料科学与工程学院,长沙410114

出　　处：《应用化学》2018年第5期559-563,共5页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金(21376068);南华大学博士科研启动基金(2016XQD36);湖南省教育厅科学研究项目(17C1361)资助~~

摘　　要：在连续流动固定床反应中,以丙烯醛二乙缩醛、水和氨为原料,合成了吡啶和3-甲基吡啶。比较了La-和KF-改性Y型分子筛的活性大小,考察了La负载量和改性方式、KF负载量及KF/Y的焙烧温度的影响。研究结果表明,与纯Y型分子筛相比,La和KF改性Y型分子筛均能增强催化活性。采用浸渍法和La负载量为1%(质量分数)时,吡啶和3-甲基吡啶总收率达到最高值;与浸渍法相比,采用离子交换法制备La-Y的活性更好。采用浸渍法、KF负载量为1%(质量分数)和KF/Y的焙烧温度为700℃时,吡啶和3-甲基吡啶总收率达到最大值。The synthesis of pyridine and 3-picoline from the reaction of acrolein diethyl acetal,water and ammonia was conducted in a fixed-bed reactor. The catalytic activities of La-and KF-modified Y zeolites were compared. Various influencing parameters,including the loadings and modified ways of La species,the loadings of KF and the calcination temperature of KF/Y,were systematically investigated. Compared to pure Y zeolite,La-and KF-modifications can enhance the catalytic activities. The catalytic activity of La-modified Y through ion exchange is better than that of the sample through wet impregnation. The total yield of pyridine and 3-picoline reaches the maximum while the loading of La via the wet-impregnation method is 1% mass fraction and the calcination temperature of KF/Y is 700 ℃.

关 键 词：缩醛 甲基吡啶 吡啶 La-Y KF/Y 

分 类 号：O643[理学—物理化学]