High-temperature-resistant synthetic natural gas methanation catalyst and preparation method thereof

The invention discloses a high-temperature-resistant synthetic natural gas methanation catalyst and a preparation method thereof, belonging to the fields of catalysts and coal chemical industry. The ingredients of the catalyst comprise active constituents, carriers and stabilizers, wherein the active constituents are Ni and Mo, the carriers are Al2O3, ZrO2, TiO2 and SiO2, and auxiliaries are rare-earth metals and alkaline-earth metals. The preparation method comprises the following steps of: A, preparing the active constituents of a precipitate via the soluble salt solution of the active constituents and a precipitator; B, preparing the high-temperature carriers by means of high-temperature roasting; and C, uniformly mixing the active constituents, the carriers and the auxiliaries, forming by tabletting, and then preparing the high-temperature-resistant methanation catalyst after high-temperature calcining. The catalyst has the characteristics that cheap non-noble metals are used as the active constituents, the high-temperature-resistant materials prepared by mixing and calcining conventional carrier oxides are used as the carriers, and the activity, the selectivity and the high-temperature stability of the catalyst are further improved by adding proper amount of rare-earth metal auxiliaries and alkaline-earth metal auxiliaries, so that the catalyst can stably run for a long time at a high temperature and a high pressure.