Performance of HZSM-5 prepared by different methods for methanol to aromatics

被引：4

作者：

He, Huanhuan ^{[1
]}

Tian, Haifeng ^{[1
]}

Jiao, Jiapeng ^{[1
]}

Zha, Fei ^{[1
]}

Guo, Xiaojun ^{[1
]}

Tang, Xiaohua ^{[1
]}

Chang, Yue ^{[1
,2
]}

机构：

[1] Northwest Normal Univ, Coll Chem & Chem Engn, Lanzhou 730070, Gansu, Peoples R China

[2] Minist Educ, Key Lab Ecofunct Polymer Mat, Lanzhou 730070, Gansu, Peoples R China

来源：

REACTION KINETICS MECHANISMS AND CATALYSIS | 2021年 / 133卷 / 02期

关键词：

HZSM-5; zeolite; Methanol to aromatics; Hollow structure; Crystallite size; ZSM-5; ZEOLITE; CATALYTIC PERFORMANCE; PARA-XYLENE; CONVERSION; DESILICATION; GASOLINE; CRACKING; DEHYDROGENATION; AROMATIZATION; MESOPOROSITY;

D O I：

10.1007/s11144-021-02041-5

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Nanoscale polymer spherical and hollow structure HZSM-5 zeolites are prepared by hydrothermal and desilication-recrystallization methods. In addition, the crystallite size of two types of HZSM-5 can be easily controlled by changing H2O/Si mole ratio. The hollow structure HZSM-5 zeolite is formed, it is due to the 010 crystal plane is the most energetically favorable orientation in silicalite-1 and the Si species is first removed on this crystal plane. The properties of different morphology zeolites were characterized by means of XRD, SEM, TEM, NH3-TPD, N-2 isothermal adsorption-desorption and TG, and the catalytic performance of these two types of HZSM-5 in MTA reaction was investigated in a fixed-bed differential reactor. The results showed that the multilevel pore structure and suitable acid strength and more acid density were obtained in the hollow structure HZSM-5 zeolite. Therefore, the hollow HZSM-5 zeolite exhibited that higher catalytic lifetime and selectivity of aromatics than nanoscale polymer spherical HZSM-5 zeolite in MTA reaction. Furthermore, the Al distribution on the 010 crystal plane may change slightly during the process of fabricating hollow mesoporous, which leads to higher selectivity of p-xylene over hollow HZSM-5 than nanoscale polymer spherical HZSM-5 zeolite.

引用

页码：1045 / 1060

页数：16

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