采用烷基偶联剂水解法制备（Ni/MgAl₂O₄）@SiO₂催化剂，探究Ni、SiO₂质量分数对催化剂的甲烷干气重整（DRM）反应活性和抗积碳性能的影响。在常压、750℃、V（CH₄）：V（CO₂）：V（N₂）=5：5：1、GHSV=26 400 mL/（g_cat·h）条件下进行DRM反应，（10Ni/MgAl₂O₄）@5SiO₂催化剂表现出最好的反应性能，CH₄转化率为77%，CO₂转化率为90%。通过TEM、SEM等表征发现，SiO₂可以包覆在Ni/MgAl₂O₄催化剂表面，阻碍Ni晶粒团聚，增大催化剂的抗积碳性能。将该催化剂在严苛条件[V（CH₄）：V（CO₂）：V（N₂）=8：2：1]下进行450 h稳定性测试，结果发现催化剂反应活性稳定，平均积碳速率仅为0.10 mg/（g_cat·h），具有较好的工业应用前景。

A (Ni/MgAl₂O₄)@SiO₂ catalyst is prepared via alkyl coupling agent hydrolysis method.The influences of Ni loadings and SiO₂ content on the catalyst's activity and carbon deposition resistance for dry-gas reforming of methane (DRM) are explored.(10Ni/MgAl₂O₄)@5SiO₂ catalyst shows the best reaction performance when it is applied in DRM reaction under the conditions such as ambient pressure,750℃,v(CH₄):v(CO₂):v(N₂)=5:5:1,GHSV=26,400 mL/(g_cat·h).The conversion rates of CH₄ and CO₂ can reach 77% and 90%,respectively.Through TEM,SEM and other characterizations,it is found that SiO₂ can coat onto the surface of Ni/MgAl₂O₄ catalyst,hindering the agglomeration of Ni crystal grains and increasing the resistance to carbon deposition.The (10Ni/MgAl₂O₄)@5SiO₂ catalyst is subjected to a 450 h stability test under severe conditions of v(CH₄):v(CO₂):v(N₂)=8:2:1.It is found that the reaction activity of the catalyst remains stable and the structure after the reaction is still complete.The average carbon deposition rate is as low as 0.10 mg/(g_cat·h),representing a potential application in industry.

苗晓玲(1996-),女,硕士研究生,研究方向为甲烷重整,18443102009@163.com;沈卫华(1977-),男,博士,副教授,研究方向为绿色化工及催化工程,通讯联系人,whshen@ecust.edu.cn。