采用氧化还原沉淀法制备了系列xCe(100-x)MnO_x(简记为xC(100-x)M,x分别为0、10%、30%、50%、80%、100%)复合氧化物,通过浸渍法负载Ni制备Ni/xC(100-x)M系列催化剂。以CH₄干重整反应制合成气为模型反应,研究Ce与Mn质量比对Ni/CeMnO_x催化剂活性的影响。结果表明,在Ni/MnO_x催化剂中引入Ce助剂,提高了催化剂的比表面积和表面碱性位点数量,改善了催化剂的还原能力。在系列Ni/CeMnO_x催化剂中,Ce与Mn质量比对反应活性有着显著的影响,Ce质量分数的增加有利于提高CH₄和CO₂转化率,在反应温度为700℃和V(CH₄)/V(CO₂)=1∶1的条件下,Ni80C20M催化剂的CH₄和CO₂转化率相对较高,CH₄转化率为73.90%,CO₂转化率为79.38%。

xCe(100-x) MnO_x(x=0%,10%,30%,50%,80%,and 100%,respectively),a series of composite oxides,are prepared via the redox precipitation method.Ni/CeMnO_x series catalysts are then prepared by loading Ni onto xCe(100-x) MnO_x through the impregnation method.The dry reforming reaction of CH₄ to syngas is served as a model reaction to study the influence of the mass ratio of Ce/Mn on the activity of Ni/CeMnO_x catalysts.It is found that the addition of Ce additives into Ni/MnO_x catalysts increases the specific surface area and the number of surface basic sites,as well as improves the reduction ability of the catalysts.Additionally,Ce addition improves the catalysts' reduction ability.In the Ni/CeMnO_x series catalysts,the mass ratio of Ce to Mn significantly impacts the reaction activity.The higher Ce mass fraction is beneficial for enhancing the conversion rates of CH₄ and CO₂.Notably,at 700℃ and V(CH₄)/V(CO₂)=1∶1,the conversion rates of CH₄ and CO₂ over Ni80Ce20Mn catalyst are relatively high,73.90% and 79.38%,respectively.

施冰梅(1996-),女,硕士生,研究方向为甲烷转化催化剂,1921346478@qq.com;储伟(1965-),男,博士,教授,博士生导师,主要从事催化材料与化学工艺研究,通讯联系人,chuwei1965@scu.edu.cn。