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针对 Mn_3O4低温催化活性低、长效稳定性差等问题，以异质原子铝作为掺杂改性剂，通过一步熔融聚合法制备了一系列不同铝掺杂的 Al:Mn_3O4复合催化剂，并以甲苯作为模拟挥发性有机化合物(volatile organic compounds,VOCs)，评估了不同催化剂的催化氧化能力。 研究结果表明：铝掺杂导致了 Mn_3O4晶体结构的松散，有利于催化剂表面活性氧从氧空位中溢出，从而促进甲苯的低温催化氧化。 当 Mn 和 Al 摩尔比为 4 时，获得的催化剂(Al:Mn_3O4-4)活性最高，其在 230 °C 以下对甲苯的总氧化活性远大于 Mn_3O4，经 过 6 h 的 连续 催 化反应 ，Al:Mn_3O4-4 催 化 剂展 现了较高的催化活性及良好的稳定性，甲苯去除率依然保持在 99%以上。
Abstract：Aiming at the problems of impoverished low-temperature activity and poor long-term catalytic stability of Mn_3O4, a series of Al-doped Mn_3O4 composites is prepared by one-step molten polymerization. Toluene is used as a simulated volatile organic compounds (VOCs) to evaluate the catalytic performance of different catalysts. The results indicate that the doping of aluminum can lead to the loosening of the crystal structure of Mn_3O4, which is conducive to the overflow of active oxygen from oxygen vacancies, improving the low-temperature efficiency of toluene oxidation.When the molar ratio of Mn/Al is 4, the obtained catalyst (Al:Mn_3O4-4) gains the highest activity. The total oxidation activity of toluene over Al:Mn_3O4-4 (< 230 °C) is much greater than that of Mn_3O4. After continuous catalytic reaction in 6 h, the removal of toluene remains above 99%, demonstrating that Al:Mn_3O4-4 possesses the high catalytic activity and excellent stability.
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基本信息:
DOI：10.12194/j.ntu.20200226002
中图分类号:X51;TQ426
引用信息:
[1]刘立忠,姚慕舟,汤艳峰,等.铝掺杂四氧化三锰低温催化氧化气态甲苯[J],2022,21(01):69-75+94.DOI:10.12194/j.ntu.20200226002.