Influence of Ni based catalysts on CH_4-CO_2 reforming reaction

摘要

The nickel based catalysts were prepared by the method of impregnation. The influence of the Ni loading, the calcination temperature, the reduction temperature, the promoter on the catalyst performances in the CH_4-CO_2 reforming reaction was investigated. The results indicate that the Ni/SiO_2 catalyst with the 10%Ni loading and calcined at 773 K for 2 h and reduced at 723 K for 2 h exhibited the best activity in the reaction, and the conversion of CH_4, CO_2 and total carbon were 67.27%, 67.21%, 67.24%, respectively. The influence of the Cr_2O_3 promoter on the properties of the catalysts was investigated. The results show that the carbon deposition on the Ni/SiO_2/Cr_2O_3 catalyst was decreased, and the activity of the catalyst was enhanced by adding Cr_2O_3 promoter in the Ni/SiO_2 catalyst. The conversion of CH_4, CO_2 and total carbon reached 69.86%, 70.47% and 70.20% on the Ni/SiO_2/Cr_2O_3 catalyst with the 10% Ni and 1.0% Cr_2O_3 calcined at 773K for 2 h and reduced at 723K for 2 h in the CH_4-CO_2 reforming reaction. The carbon deposition on Ni/SiO_2/Cr_2O_3 catalyst was decreased 26.35% compared to that on Ni/SiO_2 catalyst.