Synthesis and Catalytic Performance Evaluation  of Three Kinds of MWW Zeolites

Journal of Petrochemical Universities ›› 2008, Vol. 21 ›› Issue (1): 4-7.

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Synthesis and Catalytic Performance Evaluation of Three Kinds of MWW Zeolites

OUYANG Su-fang, LI Ying-xia**, LI Jian-wei, CHEN Biao-hua

State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029,P.R.China

Received:2007-04-16 Published:2008-03-20 Online:2017-06-28

三种MWW 型分子筛的合成与性能研究

欧阳素芳, 李英霞** , 李建伟, 陈标华

北京化工大学化工资源有效利用国家重点实验室,北京100029

作者简介:欧阳素芳(1982-),女,湖南娄底市,硕士。
基金资助:
国家973资助项目(2004CB217804)。

Abstract

Abstract:

The zeolites of MCM-22, MCM-49 and MCM-56 which have MWW layered structure were synthesised by dynamic hydrothermal method. The structure, pore volume distribution and acid property of these samples were characterized by means of XRD, BET, NH₃-TPD and Pyridine-IR.The catalytic performance of these zeolites were experimentally compared with the model reaction of alkylation of benzene with propylene, the relationship between product distribution, pore structure and acid property was also investigated. The results show that MCM-49 have the most amount of B acid sites, whereas the L acid sites predominates in MCM-56 zeolite. These three zeolites all have good catalytic performance and similar product distribution and the conversions of propylene over them are more than 99.9%.The selectivity of isopropyl benzene(IPB) over MCM-49 zeolite is the highest. However, the amount of n-propyl benzene is the highest too. Deep alkylation of IPB tend to take place on the external surface due to the small steric effect of MCM-56, so the amount of diisopropyl benzene and tri- isopropyl benzene in MCM-56 are higher than the other two zeolites.

Key words:

MWW type zeolite , , Alkylation , , Acid property , , Pore texture , , Isopropyl benzene

摘要： 采用动态水热晶化法在不同条件下合成了3种分子筛MCM-22,MCM-49和MCM-56;以XRD,
BET,NH3-TPD和吡啶吸附等方法对它们的构型、孔分布和酸性质进行了表征;以苯和丙烯烷基化合成异丙苯为
模型反应,评价了3种分子筛的催化性能,探讨了分子筛孔道和酸性质对产物分布的影响。结果表明,MCM-49的
B酸量最多,而MCM-56具有更多的L酸;3种分子筛对苯与丙烯烷基化均具有良好的催化性能,烯烃转化率都在
99.9%以上,并具有相近的产物分布。但MCM-49上异丙苯的选择性最高,产物正丙苯的量也最多;MCM-56的
结构特点使其上容易发生异丙苯的深度烷基化,因而易于二异丙苯和三异丙苯的生成。

关键词: MWW 型分子筛 , , 烷基化 , , 酸性 , , 孔道结构 , , 异丙苯

OUYANG Su-fang, LI Ying-xia*, LI Jian-wei, CHEN Biao-hua.

Synthesis and Catalytic Performance Evaluation of Three Kinds of MWW Zeolites

[J]. Journal of Petrochemical Universities, 2008, 21(1): 4-7.

欧阳素芳, 李英霞*,李建伟, 陈标华. 三种MWW 型分子筛的合成与性能研究[J]. 石油化工高等学校学报, 2008, 21(1): 4-7.

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Synthesis and Catalytic Performance Evaluation of Three Kinds of MWW Zeolites

三种MWW 型分子筛的合成与性能研究

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