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

doi:10.11944/j.issn.1000-0518.2018.05.170154

摘要/Abstract

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。

关键词: 缩醛, 甲基吡啶, 吡啶, La-Y, KF/Y

Abstract:

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 ℃.

Key words: acetal, picoline, pyridine, La-Y, KF/Y zeolite

罗才武, 赵勇, 蒋复量, 李向阳, 晁自胜. 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[J]. 应用化学, 2018, 35(5): 559-563.

LUO Caiwu, ZHAO Yong, JIANG Fuliang, LI Xiangyang, CHAO Zisheng. Synthesis of Pyridine and 3-Picoline from Acrolein Diethyl Acetal and Ammonia over La- and KF-modified Y Type Zeolite Catalysts[J]. Chinese Journal of Applied Chemistry, 2018, 35(5): 559-563.

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