碱土金属助剂对 MnO 甲苯完全氧化催化活性的影响。
Effect of alkaline earth metal promoter on catalytic activity of MnO for the complete oxidation of toluene.
机构信息
Key Laboratory of Industrial Ecology and Environmental Engineering, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
Key Laboratory of Industrial Ecology and Environmental Engineering, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
出版信息
J Environ Sci (China). 2021 Jun;104:102-112. doi: 10.1016/j.jes.2020.11.003. Epub 2020 Dec 18.
Herein, Na and Ca are introduced to MnO through cation-exchange method. The presence of Na and Ca significantly enhance the catalytic activity of MnO in toluene oxidation. Among them, the Ca-MnO catalyst exhibits the best catalytic activity (T = 194°C, T = 215°C, E = 57.2 kJ/mol, reaction rate 8.40 × 10 mol/(sec⋅m) at 210°C. T and T: the temperature of 50% and 90% toluene conversion; E: apparent activation energy) and possess high tolerance against 2.0 vol.% water vapor. Results reveal that the increased acidic sites of the MnO sample can enhance the adsorption of gaseous toluene, and the mobility of oxygen species and the content of reactive oxygen species in the catalyst are significantly improved due to the formed oxygen vacancy. Thus these two factors result in excellent catalytic performance for toluene oxidation combining with the weak CO adsorption ability.
在此，通过阳离子交换的方法将 Na 和 Ca 引入到 MnO 中。Na 和 Ca 的存在显著提高了 MnO 在甲苯氧化中的催化活性。其中，Ca-MnO 催化剂表现出最好的催化活性（T=194°C，T=215°C，E=57.2 kJ/mol，在 210°C 时的反应速率为 8.40×10 mol/(sec⋅m）。T 和 T：甲苯转化率为 50%和 90%时的温度；E：表观活化能），并且对 2.0 体积%水蒸气具有高耐受性。结果表明，MnO 样品中增加的酸性位可以增强气态甲苯的吸附，并且由于形成的氧空位，氧物种的迁移率和催化剂中反应性氧物种的含量得到显著提高。因此，这两个因素与较弱的 CO 吸附能力相结合，使得甲苯氧化具有优异的催化性能。
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