In order to investigate the surface structure changes of nickel-based catalysts during the syngas methanation process, nickel-based catalysts were prepared with impregnation method and the tests were carried out in a fluidized bed reactor. The test results showed that the catalytic performance declined rapidly with the reaction time. Energy dispersive spectroscopy measurements of the reacted catalyst were carried out and the results indicated that there was carbon observed on the catalysts surface. The carbon deposited on the catalyst surface was removed in a thermogravimetric analyzer to obtain the regenerated catalyst and it was found that the amount of the accumulated carbon on the catalyst surface was 2.09 wt% of the reacted catalyst. N₂ adsorption–desorption measurements were conducted on the fresh catalyst, reacted catalyst and regenerated catalyst. The specific area of the reacted catalyst decreased significantly and could not restore to the original level even after removing the deposited carbon. The pore volume of reacted catalyst increased 16.67% compared to the fresh catalyst while the average pore diameter remained almost no change. The pores existing on the fresh catalyst were mainly the mesopores while the pore size distribution expanded and the macrospores came into being on the reacted catalyst. It can be concluded that a kind of stable carbon was produced on the catalyst surface after methanation process, which caused dramatic changes to the surface textural properties.

为了研究合成气甲烷化过程中镍基催化剂的表面结构变化，采用浸渍法制备了镍基催化剂，并在流化床反应器中进行了测试。试验结果表明，随着反应时间的延长，催化性能迅速下降。对反应的催化剂进行能量色散光谱测量，结果表明在催化剂表面上观察到碳。在热重分析仪中除去沉积在催化剂表面上的碳以获得再生的催化剂，发现在催化剂表面上的积碳量为反应的催化剂的2.09wt％。N ₂对新鲜催化剂，反应催化剂和再生催化剂进行了吸附-解吸测量。反应的催化剂的比表面积显着降低，并且即使除去沉积的碳也不能恢复到原始水平。与新鲜催化剂相比，反应的催化剂的孔体积增加了16.67％，而平均孔径几乎保持不变。在新鲜催化剂上存在的孔主要是中孔，而孔径分布扩大并且在反应后的催化剂上形成了大孔。可以得出结论，甲烷化过程后在催化剂表面产生了一种稳定的碳，这引起了表面织构性质的巨大变化。