Citation: CUI Xing-Yu, WANG Jing-Jing, PAN Meng, NING Wei-Wei, YAN Lin-Lin, ZHENG Jia-Jun, LI Rui-Feng. Hierarchical SAPO-34: Synthesis and Catalytic Performances in Methanol to Olefins[J]. Chinese Journal of Inorganic Chemistry, ;2018, 34(2): 300-308. doi: 10.11862/CJIC.2018.046 shu

Hierarchical SAPO-34: Synthesis and Catalytic Performances in Methanol to Olefins

Research Centre of Energy Chemical & Catalytic Technology, Taiyuan University of Technology, Taiyuan 030024, China

Corresponding author: ZHENG Jia-Jun, zhengjiajun@tyut.edu.cn
Received Date: 11 July 2017
Revised Date: 31 August 2017

Figures(8)

SAPO-34 is prone to losing its activity during methanol to olefins (MTO). Hierarchical SAPO-34 with different particles size was synthesized in a hydrothermal procedure. The factors controlling the size of SAPO-34 zeolite such as aluminum species and silicon species, and the effect of secondary template on the synthesis of hierarchical SAPO-34 were investigated in details. The as-synthesized samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, N₂ adsorption-desorption, transmission electron microscopy (TEM), and NH_3-TPD techniques. The results displayed that the different silicon species can tailor the crystalline size effectively, Secondary template can give the as-synthesized SAPO-34 a mesopore structure with crystalline walls, which contributes to enhancing the thermostability, especially the hydrothermal stability during the MTO process. The catalytic performance of the as-synthesized SAPO-34 was investigated during the MTO, as compared with the referenced SAPO-34-R, hierarchical SAPO-34 displayed an excellent catalytic performance during the MTO by giving a prolonged catalytic life and an elevated selectivity for oil while a depressed olefins selectivity because of the shortened microporous channel length caused by the nanocrystallization or the introduced mesopore system.
- nanocrystals,
- hierarchical pores,
- methanol to olefins,
- oil/olefin ratios
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