Abstract:porous silica for the dry reforming of methane. The influence of preparation method and process parame⁃ters on the stability and coke resistance of the catalysts were investigated, by comparing the catalystsprepared withdifferentammoniaconcentrationaswellasthatwithimpregnationmethod.Characterization and analysis including ICP-OES, XRD, N2isothermal adsorption-desorption, TEM,H2-TPR, Raman and TGA/DSC were carried out. It was found that Ni phyllosilicate was formed by u⁃sing ammonia evaporation method, which promoted the high dispersion of Ni in the mesopores and ef⁃fectively prevented carbon deposition. Catalysts prepared with 28% and 20% ammonia presented excel⁃lent catalytic activity and coke resistance. The conversion of CH4and CO2in the methane dry reformingreaction at 700 ℃ was ca. 85% and ca. 91%, respectively, with almost no carbon deposition. Whenthe ammonia concentration was reduced to 10%, the formation of excessive Ni phyllosilicate destroyedthe mesoporous structure, leading to severe carbon deposition. The same situation happened to the cata⁃lyst prepared by impregnation method owing to the agglomeration of Ni particles on the external surfaceof the support. Close-