高等学校化学学报 ›› 2025, Vol. 46 ›› Issue (3): 20240394.doi: 10.7503/cjcu20240394

• 物理化学 • 上一篇    下一篇

核壳结构块体的构筑及催化氯苯燃烧性能

刁振恒1,2, 李昊2, 国文2, 郑鹏飞2, 王斌2, 吉洪轮2, 田亚杰3(), 孙德2, 李莉1()   

  1. 1.吉林大学无机合成与制备化学国家重点实验室,化学学院,长春 130012
    2.长春工业大学化学工程学院,长春 130012
    3.河南大学能源科学与技术学院,郑州 450046
  • 收稿日期:2024-08-19 出版日期:2025-03-10 发布日期:2024-10-08
  • 通讯作者: 李莉 E-mail:yjtian@henu.edu.cn;lili_jlu@jlu.edu.cn
  • 作者简介:田亚杰, 男, 博士, 副教授, 主要从事绿色化学工程方面的研究. E-mail: yjtian@henu.edu.cn
  • 基金资助:
    国家自然科学基金(22008012);吉林省教育厅科学研究项目(JJKH20231127KH);吉林大学实验技术项目(SYXM2024a002)

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)

摘要:

基于同轴3D打印策略, 构筑了以HZSM-5分子筛(Z5)为外壳活性位点, 铈锰负载HZSM-5(CM/Z5), Silicalite-1或ZrO2为内核活性位点的核壳结构块体催化剂. 探究了载体种类对块体催化氯苯燃烧性能的影响机理, 解析了核壳结构在氯苯燃烧过程中的作用机制. 与HZSM-5和Silicalite-1载体相比, ZrO2载体更有利于氧空位形成, 但HZSM-5载体的Brønsted酸位与铈锰组分的氧空位协同作用大幅提高了氯苯转化率和HCl选择性. HZSM-5外壳作为脱氯中心, 限制了氯组分在铈锰氧化物表面的沉积, 减缓了催化剂氯中毒, 提高了催化剂的稳定性. 以HZSM-5为内核载体构筑的CM/Z5@Z5块体因壳层脱氯、 内核中酸性位与氧空位协同脱氯-深度氧化的串级催化过程, 呈现出良好的催化活性、 稳定性及HCl和CO2选择性, 其催化氯苯转化的T50(转化率达50%时的反应温度)和T90(转化率达90%时的反应温度)分别低至206和294 ℃.

关键词: 同轴3D打印, HZSM-5分子筛, 铈锰氧化物, 催化氯苯燃烧, 核壳块体催化剂

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

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