Pore-structure-mediated hierarchical SAPO-34: Facile synthesis, tunable nanostructure, and catalysis applications for the conversion of dimethyl ether into olefins--颗粒学报PARTICUOLOGY

Cui, Y., Zhang, Q., He, J., Wang, Y., & Wei, F. (2013). Pore-structure-mediated hierarchical SAPO-34: Facile synthesis, tunable nanostructure, and catalysis applications for the conversion of dimethyl ether into olefins. Particuology, 11(4), 468–474. https://doi.org/10.1016/j.partic.2012.12.009

Pore-structure-mediated hierarchical SAPO-34: Facile synthesis, tunable nanostructure, and catalysis applications for the conversion of dimethyl ether into olefins

Yu Cui, Qiang Zhang, Jie He, Yao Wang, Fei Wei^*

Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

10.1016/j.partic.2012.12.009

Volume 11, Issue 4, August 2013, Pages 468-474

Received 29 April 2012, Revised 31 October 2012, Accepted 4 December 2012, Available online 25 March 2013.

E-mail: wf-dce@tsinghua.edu.cn

Highlights

• Hydrothermal synthesis of hierarchical cross-like SAPO-34 catalysts

• The SAOP-34 shows enriched multi-porosity.

• Dramatic catalytic performance in dimethyl ether to olefins conversion.

• A maximum selectivity of olefins of 96% was achieved.

Abstract

Hierarchical cross-like SAPO-34 catalysts with different pore size distributions were obtained via hydrothermal synthesis with polyethylene glycol (PEG) as the mesopore-generating agent. The hierarchical SAPO-34 molecular sieves were characterized using X-ray diffraction, scanning electron microscopy, N₂ adsorption–desorption, thermogravimetric analysis, and temperature-programmed NH₃ desorption. The cross-like SAPO-34 catalysts exhibited enriched multi-porosity, and the sizes of their mesopores ranged from 10 to 50 nm. Both the mesoporous structures and morphologies of the hierarchical SAPO-34 could be further tuned through adjustments of the amount of PEG used. The as-obtained SAPO-34 showed dramatic catalytic performance in the conversion of dimethyl ether into olefins. A maximum selectivity of olefins of 96% was achieved, which was attributed to the rapid transport of the reactants and products in zeolitic micropores through mesopores.

Graphical abstract

Keywords

SAPO-34; Methanol to olefin; Hierarchical; Nanostructure; Mesoporous materials

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