La_2O_3对CH_4氧化的催化机制

The Catalytic Mechanism of La 2O 3 for the Oxidation of Methane

本文研究了Ｌａ２Ｏ３对ＣＨ４氧化燃烧和氧化偶联的催化机制。实验采用的是分子束技术，以及俄歇电子能谱（ＡＥＳ），四极柱质谱（ＱＭＳ）和Ｘ射线光电子能谱（ＸＰＳ）等表面分析技术。实验结果表明ＣＨ４分子的平动能和Ｌａ２Ｏ３表面的晶格氧（Ｏ２－）是催化氧化ＣＨ４的两个关键因素。燃烧室内壁涂以稀土氧化物催化层将会提高燃烧效率和减少废气污染。

In this paper, the catalytic mechanism of La 2O 3 for the oxidation of methane and the oxidative coupling of methane were studied. The experimental works were carried by using the molecular beam technique and the surface analysis technique (AES, QMS, XPS). The experiments show that the translation energy of methane molecule and the lattice oxygen (O 2- ) of La 2O 3 surface are two key factors for the catalysis. It is possible that the rare earth oxide coated layer of combustion chamber will raise the efficiency of combustion and reduce the pollution of combustion gas.