| 赵安莲,任业为,曲振平.镧钴钙钛矿催化剂制备及其催化氧化甲苯性能与机理[J].,2023,63(5):472-478 |
| 镧钴钙钛矿催化剂制备及其催化氧化甲苯性能与机理 |
| Preparation of lanthanum cobalt perovskite catalyst and its performance and mechanism for catalytic oxidation of toluene |
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| DOI：10.7511/dllgxb202305005 |
| 中文关键词:钙钛矿溶胶凝胶法催化氧化甲苯 |
| 英文关键词:perovskitesol-gel methodcatalytic oxidationtoluene |
| 基金项目:国家自然科学基金资助项目(21876019). |
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| 摘要点击次数:99 |
| 全文下载次数:126 |
| 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．探究了溶胶凝胶形成温度和煅烧温度对最终制得的镧钴钙钛矿(LaCoO3)催化剂的结构及催化氧化甲苯性能的影响，并研究其作用机理．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，稳定制得的LaCoO3催化剂在225 ℃下达到90%的甲苯转化率(甲苯浓度：436 mg/L，空速：22 500 mL/(g·h))，在98%甲苯转化率稳定运行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 performance in toluene oxidation of the eventually prepared lanthanum cobalt perovskite (LaCoO3) catalyst, as well as the mechanism behind it, are examined. 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 prepared LaCoO3 catalyst can achieve 90% of toluene conversion (toluene concentration: 436 mg/L, space velocity: 22 500 mL/(g·h)) at 225 ℃. After the stable operation of 98% of toluene conversion for 24 h, 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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