负载型镧锰钙钛矿催化剂上甲烷催化燃烧的研究

Study on Catalytic Combustion of Methane over the Supported La-Mn Perovskite Catalysts

研究了甲烷在负载型镧锰钙钛矿催化剂(LCFM/α-Al2O3)上的低温催化燃烧反应,考察了制备方法、焙烧温度对催化剂结构和活性的影响,并进行了100h稳定性实验.实验结果表明用浸渍法、焙烧温度高于800℃就能在载体上生成良好的钙钛矿结构,催化剂具有较低的起燃温度并且在高温条件下具有与非负载型镧锰钙钛矿催化剂相当的活性;100h稳定性实验表明LCFM/α-Al2O3催化剂经历了100h,800℃的连续高温燃烧反应,催化剂仍保持了原有结构和催化活性,并且没有明显积碳.

Catalytic combustion of methane has been investigated over a series of supported La\|Mn perovskite catalysts prepared by different method. XRD analysis revealed that perovskite\|type structure was well formed on the surface of the catalysts prepared by inceptive wetness impregnation and calcined at 800 ℃, These supported catalysts have a lower ignition temperature and exhibit high catalytic activities for methane combustion at high temperature. The results of stability test showed that the perovskite\|type structure and catalytic performances of the catalyst have not significantly changed after 100 h on\|stream at 800 ℃.