The Ni catalysts supported on γ-Al2O3 were synthesized by an impregnation method.Their catalytic performance in methane dry reforming was investigated.The reforming reactions were carried out in a mieroreactor using a CO2∶CH4 feed ratio of 1∶1,a F/W =2640ml/(h·g),reaction temperatures between 500-850 ℃,and at atmospheric pressure.The influence of Ca,Ce,and Zr promoters on catalyst stability,coke deposition,and the H2/CO ratio were also studied.Effluents were analyzed using an online gas chromatograph equipped with a thermal conductivity detector.The spent and fresh catalysts were characterized by scanning electron microscopy and thermogravimetric analysis.It was found that 3％Ni/γ-Al2O3 promoted with 0.15％ Ce and 0.05％ Ca gave the best performance and resulted in less coke formation.The highest CH4 and CO2 conversion activities were found to be 94.1％ and 98.3％ at 850 ℃,respectively.Stability tests were carried out for 130 h and this provided a H2 yield of 91％.Moreover,the amount of formed carbon was negligible and did not increase to more than 1.5 wt％.