采用共沉淀法制备添加La助剂的NiMgAl水滑石催化剂，并用于甲烷干气重整反应。通过XRD、BET、TG、H₂-TPR和CO₂-TPD等手段对催化剂进行了表征。结果表明，La的加入增加了催化剂碱性位点的总量，降低了催化剂的还原温度。La₂O₃吸附活化CO₂形成La₂O₂CO₃可抑制积碳的形成，提高了催化剂的抗积碳性能。当La质量分数为1.0%时，催化剂的催化活性最高，对比NiMgAl催化剂，在反应100 h后，该催化剂仍保持着很高的活性。

La-promoted NiMgAl mixed-oxide catalysts derived from hydrotalcite are synthesized by coprecipitation method and are used in carbon dioxide reforming of methane.XRD,BET,TG,H₂-TPR and CO₂-TPD are used to characterize the catalysts.It is proved that the addition of lanthanum into NiMgAl mixed-oxide catalysts can reduce the reduction temperature of the catalysts.Lanthanum improves evidently the catalysts' resistance to carbon deposition by increasing the basicity of the catalyst,forming the La₂O₂CO₃ phase and improving nickel metal dispersion.The catalyst's catalytic activity achieves the optimal value when the content of lanthanum in the catalyst is 1.0 wt%.Therefore,compared with NiMgAl catalyst,La-NiMgAl maintains higher reaction activity after serving the reaction for 100 h.

方琼(1994-),女,硕士研究生,研究方向为绿色化工工艺的开发和利用,babyfortune@163.com