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用XRD技术表征了LnAlO_3的体相结构和晶体的畸变度,用TPD技术考察了LnAlO_3的吸附氧行为。表征结果与催化性能关联表明,LnAlO_3的畸变度大、缺陷多、吸附氧的能力强,其催化性能就好;吸附的原子氧是活化甲烷生成C_2的氧种。
The phase structure and crystal distortion of LnAlO_3 were characterized by XRD, and the adsorption oxygen behavior of LnAlO_3 was investigated by TPD technique. The correlation between the characterization results and the catalytic properties shows that LnAlO_3 has a large amount of distortion, many defects, strong ability of adsorbing oxygen, and good catalytic performance. The adsorbed atomic oxygen is an oxygen species that activates methane to generate C_2.