Tri-reforming of Methane to Syngas over Ni/ Al_2O_3

Ni was dispersed on γ-Al2O3 with large pore volume and high specific surface area by using wet impregnation method. The catalytic performances of Ni/Al2O3 in tri-reforming of methane to syngas (TRM) under different reaction conditions such as temperature, pressure and space velocity, and the feedstock composition were studied in a fix-bed reactor. The effect of calcination temperature on stability of catalysts was also investigated. The results showed that catalyst calcined at 650 ℃ exhibited higher stability than catalysts calcined at other temperatures. 95.4% of CH4 conversion and 84.6% of CO2 conversion were achieved at 850 ℃ under atmospheric pressure and with feed composition of n(CH4)/n(CO2)/n(H2O)/n(O2)=1/0.48/0.54/0.1 and space velocity of 10 080 h-1. High temperature and low pressure are favorable to TRM reaction. Feed compositions affect only on CO2 conversion and n(H2)/n(CO) ratio of syngas, whereas not on CH4 conversion.