The reaction of methane with CO2 and H2O using catalyst MCD-2(a-Al2O3 with15%～17% impregnated NiO) has been investigated. After a 500 h continuous run underconditions: n (CH4): n(CO2): n(H2O)= 1: 1. 5: 0. 9,CH4 space velocity 1000 h-1,tem temperature 600～900℃ and 0. 6 MPa, it is found that the porous structure, mechanicalstrength,content of active nickel,XRD patterns and content of deposited carbon on the catalyst did not change drastically and the activity of the catalyst kept steady with the CH4 conversion,CO content on the product gas and H2/CO ratio being ≥92%, ～40% and ～1respectively.
The active oxygen species on the surface of additive/rare earth oxides (RE2O3)catalysts have been investigated by means of XPS, O2-TPD and XRD. The results indicate that there exist O and O2- species on the surface of the catalysts at low temperature. The performance of the catalyst is dependent on the concentration of O species on the catalyst surface. It is suggested that the O- species formed from O species at high temperature is active oxygen species for OCM reaction.
