Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Conversion of Dimethyl Ether to Light Olefins over a Lead-Incorporated SAPO-34 Catalyst with Hierarchical Structure

  • Kang Song (Department of Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Jeong Hyeon Lim (Department of Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Young Chan Yoon (Department of Chemical Engineering and Applied Chemistry, Chungnam National University) ;
  • Chu Sik Park (Korea Institute of Energy Research) ;
  • Young Ho Kim (Department of Chemical Engineering and Applied Chemistry, Chungnam National University)
  • Received : 2023.08.18
  • Accepted : 2023.09.04
  • Published : 2023.10.10
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Abstract

SAPO-34 catalysts were modified with polyethylene glycol (PEG) and Pb to improve their catalytic lifetime and selectivity for light olefins in the conversion of dimethyl ether to olefins (DTO). Hierarchical SAPO-34 catalysts and PbAPSO-34 catalysts were synthesized according to changes in the molecular weight of PEG (M.W. = 1000, 2000, 4000) and the molar ratio of Pb/Al (Pb/Al = 0.0015, 0.0025, 0.0035), respectively. By introducing PEG into the SAPO-34 catalyst crystals, an enhanced volume of mesopores and reduced acidity were observed, resulting in improved catalytic performance. Pb was successfully substituted into the SAPO-34 catalyst frameworks, and an increased BET surface area and concentration of acid sites in the PbAPSO-34 catalysts were observed. In particular, the concentrations of the weak acid sites, which induce a mild reaction, were increased compared with the concentrations of strong acid sites. Then, the P2000-Pb(25)APSO-34 catalyst was prepared by simultaneously utilizing the synthesis conditions for the P2000 SAPO-34 and Pb(25)APSO-34 catalysts. The P2000-Pb(25)APSO-34 catalyst showed the best catalytic lifetime (183 min based on DME conversion > 90%), with an approximately 62% improvement compared to that of the unmodified catalyst (113 min).

Keywords

Acknowledgement

This work was supported by research fund of Chungnam National University.

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