Chem. J. Chinese Universities ›› 2025, Vol. 46 ›› Issue (3): 20240394.doi: 10.7503/cjcu20240394

• Physical Chemistry • Previous Articles     Next Articles

Fabrication of Core-shell Structured Monoliths and Their Catalytic Performance for Chlorobenzene Combustion

DIAO Zhenheng1,2, LI Hao2, GUO Wen2, ZHENG Pengfei2, WANG Bin2, JI Honglun2, TIAN Yajie3(), SUN De2, LI Li1()   

  1. 1.State Key Laboratory of Inorganic Synthesis and Preparative Chemistry,College of Chemistry,Jilin University,Changchun 130012,China
    2.School of Chemical Engineering,Changchun University of Technology,Changchun 130012,China
    3.School of Energy Science and Technology,Henan University,Zhengzhou 450046,China
  • Received:2024-08-19 Online:2025-03-10 Published:2024-10-08
  • Contact: LI Li E-mail:yjtian@henu.edu.cn;lili_jlu@jlu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22008012);the Scientific Research Project of the Education Department of Jilin Province, China(JJKH20231127KH);the Project on Experimental Technique of Jilin University, China(SYXM2024a002)

Abstract:

Core-shell structured monolith catalysts with HZSM-5(Z5) zeolite as the active sites of the shell and Ce-Mn species doped HZSM-5(CM/Z5), Silicalite-1 or ZrO2 as the active sites of the core were fabricated by coaxial 3D printing. The influencing mechanism of the carrier kind on the catalytic performance of chlorobenzene combustion, as well as the function mechanism of the core-shell structure during the catalytic process, were both investigated. Compared with HZSM-5 and Silicalite-1, ZrO2 as the carrier benefited the formation of oxygen vacancies in catalysts. But HZSM-5 as the carrier could enhance chlorobenzene conversion and HCl selectivity, due to the synergistic effect between Brønsted acid sites in HZSM-5 carrier and oxygen vacancies in Ce-Mn species. The HZSM-5 shell exhibited excellent performance in the dechlorination process, which limited the deposition of chlorine (Cl) specie on the surface of Ce-Mn oxides, retarded the Cl poisoning of the catalyst and thus enhanced the catalyst stability. The CM/Z5@Z5 monolith prepared with HZSM-5 as the carrier exhibited excellent catalytic activity, stability, and selectivities to HCl and CO2, with the T50 and T90 of chlorobenzene conversion of 206 and 294 ℃, respectively. This is due to the tandem process of dechlorination by the HZSM-5 shell and the dechlorination-deep oxidation by the synergistic effect between Brønsted acid sites and oxygen vacancies.

Key words: Coaxial 3D printing, HZSM-5 zeolite, Ce-Mn oxide, Catalytic chlorobenzene combustion, Core-shell monolith catalyst

CLC Number: 

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