Enhanced MTO performance over acid treated hierarchical SAPO-34

doi:10.1016/S1872-2067(16)62557-3

Chinese Journal of Catalysis ›› 2017, Vol. 38 ›› Issue (1): 123-130.DOI: 10.1016/S1872-2067(16)62557-3

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Enhanced MTO performance over acid treated hierarchical SAPO-34

Shu Ren^a,b, Guojuan Liu^b, Xian Wu^a,c, Xinqing Chen^b, Minghong Wu^c, Gaofeng Zeng^b, Ziyu Liu^b, Yuhan Sun^b

a College of Science, Shanghai University, Shanghai 201900, China;
b CAS Key Laboratory of Low-Carbon Conversion Science and Engineering, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China;
c School of Environmental and Chemical Engineering, Shanghai University, Shanghai 201900, China

Received:2016-09-27 Revised:2016-10-17 Online:2017-01-18 Published:2017-01-18
Contact: Ziyu Liu,Tel:+86-21-20350958;Fax:+86-21-20325034;E-mail:liuziyu@sari.ac.cn;Yuhan Sun,Tel:+86-21-20322009;Fax:+86-21-20325034;E-mail:sunyh@sari.ac.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (21403279, 21507141, 21506243), and the Science and Technology Commission of Shanghai Municipality (14DZ1207602, 14DZ1203700).

Abstract

Abstract:

Hierarchical SAPO-34 crystals were synthesized by a facile acid etching post-treatment. Butter-fly-shaped porous patterns on four side faces and hierarchical pores composed of micropores, mesopores and macropores were formed after a nitric acid or oxalic acid treatment. The catalytic performance of the hierarchical SAPO-34 for the methanol to olefins (MTO) process showed that the synergistic effect of the hierarchical pores and acid sites resulted in a longer catalyst lifetime (from 210 to 390 min for the acid treated SAPO-34) and higher selectivity to light olefins of 92%-94%. The ethylene selectivity can be adjusted between 37.4% and 51.5% by the pore size. No hierarchical SAPO-34 was obtained after a treatment with butanedioic acid, and with this sample, fast deactiva-tion was detected after 100 min.

Key words: Acid treatment, Hierarchical pore, SAPO-34, Methanol to olefins, Single-run lifetime

Shu Ren, Guojuan Liu, Xian Wu, Xinqing Chen, Minghong Wu, Gaofeng Zeng, Ziyu Liu, Yuhan Sun. Enhanced MTO performance over acid treated hierarchical SAPO-34[J]. Chinese Journal of Catalysis, 2017, 38(1): 123-130.

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Enhanced MTO performance over acid treated hierarchical SAPO-34

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