中文摘要：

六铝酸盐甲烷高温燃烧催化剂研究目前主要集中在BaMnAl11 O19基和LaMnAl11 O19基的催化剂上，关于LaFeAl11O19催化剂研究相对较少，而据文献报道在沉淀法制备取代型的六铝酸钡催化剂中铁和锰活性相近，但铁比锰具有更高的耐高温和抗水热冲击的能力，因此本工作选择LaFeAl11O19基甲烷高温燃烧催化剂作为研究对象，探讨稀土铈掺杂对LaFeAl11O19高温燃烧催化剂结构和性能的影响。

英文摘要：

A series of catalysts, hexaaluminates LaCexFe1-xAl11 O19 （x = 0, 0.2, 0.4, 0.6, 0.8, 1 ） were prepared by the co-precipitation method. The influences of the Ce doped on structure and catalytic performance of catalysts were studied by XRD,FT-IR, H2-TPR, UV-DRS,XPS, EC （Electrical conductivity） and methane combustion activity test. The result shows that rare earth Ce species are more readily to exist in the form of CeO2 over the catalysts than to enter the bulks of LaFeAl11 O19hexaaluminates to substitute AI and Fe. Compared with catalyst LaFeAl11O19 without Ce doped, the Ce doped catalysts are being higher catalytic activity for methane combustion. Under reaction conditions of 4800h^-1 air velocity, and LaCe0.8Fe0.2Al 11O19 showed thc highest activity. It indicated that the CeO2, was contributed to improve the catalytic activity of LaCe0.8 Fe0.2Al 11 O19. Meanwhile, with Ce-containing increasing, the FT-IR spectra of each sample move forward the direction of higher wave-numbers slightly. Catalysts reduced proceeding becomes difficult. XPS and EC （Electrical conductivity） tests found that charge density of Fe^3＋ was added and Fe2P3 binding energy shifted to minus direction, electrical conductivity performance revealed that La-Fe hexaaluminates belonged to n-type semiconductor. After doped Ce, we found that electrical conductivity decline. When content of Ce reaches to x =0.8, the sample＇s electrical conductivity becomes zero.