A green route for the synthesis of nano -sized hierarchical ZSM-5 zeolite with excellent DTO catalytic performance

被引：65

作者：

Chen, Zhiwen ^{[1
]}

Li, Zhuo ^{[1
]}

Zhang, Yan ^{[1
]}

Chevella, Durgaiah ^{[2
]}

Li, Guomin ^{[1
]}

Chen, Yanping ^{[2
]}

Guo, Xianghe ^{[1
]}

Liu, Jian ^{[2
,3
]}

Yu, Jianqiang ^{[1
]}

机构：

[1] Qingdao Univ, Collaborat Innovat Ctr Marine Biomass Fiber Mat &, Sch Chem & Chem Engn, 308 Ningxia Rd, Qingdao 266071, Peoples R China

[2] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

[3] Univ Surrey, Dept Chem & Proc Engn, DICP Surrey Joint Ctr Future Mat, Guildford, Surrey, England

来源：

CHEMICAL ENGINEERING JOURNAL | 2020年 / 388卷

基金：

中国国家自然科学基金;

关键词：

Nano-sized hierarchical ZSM-5; Dimethyl ether to olefin; Freeze vacuum drying; Prolonged lifetime; Microporous materials; DIMETHYL ETHER; HZSM-5; ZEOLITE; LIGHT OLEFINS; TO-OLEFINS; METHANOL; CONVERSION; PROPYLENE; H-ZSM-5; DEACTIVATION; CRYSTALLIZATION;

D O I：

10.1016/j.cej.2020.124322

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Nano-sized hierarchical ZSM-5 zeolite with high crystallization was prepared by a novel green strategy, that is, the consecutive freezing and vacuum drying route. In comparison with the traditional synthesis process, only 1/5 amount of TPAOH (tetrapropylammonium hydroxide) template was involved. Moreover, hierarchical structured zeolites can be formed even in the absence of mesoporous template (e. g. cetyltrimethylammonium bromide, CTAB). Moreover, the hierarchical ZSM-5 with a wide range of SiO2/Al2O3 ratio (25-200) can be modulated. The effects of the consecutive freezing and vacuum drying methods on the formation process, pore characteristics, crystallinity, morphology and acidity of the ZSM-5 zeolites were explored. It is noted that the abundant intracrystal mesopores and nanoparticles structure were generated from the porous structure on the surface of the freeze-dried powder. The constructed nano-sized and hierarchical ZSM-5 catalyst exhibits a prolonged lifetime of 110 h in dimethyl ether-to-olefin (DTO) reaction, which is around 3.7-fold lifetime compared to the conventional microporous ZSM-5.

引用

页数：10

共 65 条

[1] Hydrothermal synthesis of nanostructured Ce-SAPO-34: High-performance and long-lifetime catalyst with various ceria contents for methanol to light olefins conversion [J].