制备方法对锰Mn掺杂钾六铝酸盐催化剂催化甲烷燃烧性能的影响(英文)

Effect of Preparation Method on Catalytic Property of Mn-substituted Potassium Hexaaluminate for Methane Combustion

以甲烷催化燃烧为目标反应,通过共沉淀法、溶胶凝胶法和反相微乳液法制备了Mn掺杂六铝酸盐催化剂,用XRD和TG-DTA技术对催化剂进行了物理性能表征,通过BET模型计算了其比表面积。结果说明3种方法所制备催化剂经1 200℃焙烧4h后均可以形成完整的六铝酸盐晶型,同时都具有高的催化性能和高温稳定性,其中反相微乳液法制备的K2MnAl11O19催化剂具有较高的比表面积和甲烷催化燃烧活性,起燃温度T10%为458℃,至676℃甲烷完全转化。

Manganese substituted potassium hexaaluminate catalyst was prepared by co-precipitation method, sol- gel method and reverse microemulsion-mediated method. The title catalyst was calcined at 1 200 °C and characterized by XRD and TG-DTA techniques. The catalytic activity was evaluated for methane combustion. The specific surface area of them was calculated using the BET model. The samples exhibit significant catalytic activity for methane combustion at 800 °C. Upon calcination at 1 200 °C the K2MnA111019 prepared by reverse microemulsion-mediated method retains a specific surface area of 34 m2.g-1 and shows an excellent activity for methane combustion （the conversions of 10% and 90% are obtained at 458 and 670 °C, respectively）.