文章摘要
镧钴钙钛矿催化剂制备及其催化氧化甲苯性能与机理研究
Study on Preparation of lanthanum cobalt perovskite catalyst and its performance and mechanism for catalytic
投稿时间:2022-05-05  修订日期:2022-06-01
DOI:
中文关键词: 钙钛矿  溶胶凝胶法  催化氧化  甲苯
英文关键词: perovskite  sol-gel method  catalytic oxidation  toluene
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位邮编
赵安莲 大连理工大学环境学院 116024
任业为 大连理工大学 环境学院 
曲振平 大连理工大学 环境学院 116024
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中文摘要:
      开发高效、稳定、经济的催化剂是催化氧化技术在消除气态VOCs中的核心问题. 本文探究了溶胶凝胶形成温度以及煅烧温度对最终合成的镧钴钙钛矿(LaCoO3)催化剂的结构及催化氧化甲苯性能的影响,并探究了其作用机理. 研究结果表明,在以80 ℃为最佳溶胶凝胶形成温度、700 ℃为最佳煅烧温度的条件下,稳定合成出的LaCoO3催化剂表现出最佳的催化氧化甲苯性能,在225 ℃下达到90%的甲苯转化率(甲苯浓度:500 ppm,空速:22,500 mL·g-1·h-1). 在稳定运行24 h后,催化剂依然能保持完整结构. 机理研究表明,在LaCoO3催化氧化甲苯的过程中,催化剂上的氧物种能够直接参与到反应中,同时气相氧的加入可以促进甲苯在LaCoO3催化剂上的转化.
英文摘要:
      The primary difficulty of catalytic oxidation technology in removing gaseous VOCs is developing efficient, stable, and cost-effective catalysts. The impacts of sol-gel formation temperature and calcination temperature on the structure and catalytic oxidation of toluene of the eventually synthesized lanthanum cobalt perovskite (LaCoO3) catalyst, as well as the mechanism behind it, are examined in this work. The results show that under the conditions of 80 ℃ as the optimal sol-gel formation temperature and 700 ℃ as the optimal calcination temperature, the stable synthesized LaCoO3 catalyst shows the best catalytic oxidation performance, and can achieve 90% toluene conversion (toluene concentration: 500 ppm, space velocity: 22,500 mL·g-1·h-1) at 225 ℃. After the stable operation test, the catalyst can still maintain its complete structure. The mechanism investigation reveals that in the process of toluene catalytic oxidation over LaCoO3 catalyst, oxygen species on the catalyst may directly engage in the reaction, and that adding gas-phase oxygen can boost toluene conversion on the catalyst.
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