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对采用常规还原和等离子体还原的两种Ni-Al2O3催化剂进行了程序升温脱附(TPD)表征。用气相色谱进行在线分析,得到了不同催化剂表面的H2-TPD和CO2-TPD谱图。谱图表明,等离子体还原的催化剂比常规还原催化剂对H2和CO2的吸附量更大,说明该催化剂中活性金属组分的分散度更好,催化剂表面的活性中心数目更多,更有利于甲烷二氧化碳催化重整反应的进行。对两种催化剂进行催化反应评价,其结果与TPD结果很好地吻合。
Temperature-programmed desorption (TPD) characterization was performed on two Ni-Al 2 O 3 catalysts using conventional reduction and plasma reduction. By gas chromatography on-line analysis, the H2-TPD and CO2-TPD spectra of different catalyst surfaces were obtained. The spectra show that the plasma-reduced catalyst adsorbs more H2 and CO2 than the conventional reduction catalyst, indicating that the catalyst has better dispersion of active metal components and more active sites on the surface of the catalyst, which is more favorable for methane Carbon dioxide catalyzes the reforming reaction. Catalytic reactions of the two catalysts were evaluated and the results were in good agreement with the results of TPD.