Methanation reaction catalyst as well as preparation method and application thereof

The invention discloses a methanation reaction catalyst as well as a preparation method and application thereof. The catalyst comprises an inorganic salt modified thermo-sensitive polymer modified all-silicon zeolite S-1 carrier, a metal active component Ni loaded on the carrier, and an auxiliary component Mo, wherein the auxiliary component comes from a formaldehyde waste iron-molybdenum catalyst. The catalyst disclosed by the invention has the thermal stability of a molecular sieve structure and unique shape selectivity of a crystal pore channel, is beneficial to improving the low-temperature activity and the dispersity of metal particles, and is high in poisoning resistance. According to the preparation method of the catalyst, recycling of effective components in the formaldehyde waste iron-molybdenum catalyst is achieved, the low-temperature activity of the methanation reaction catalyst is improved, generation of nickel carbonyl is effectively inhibited, and the catalyst shows good stability. 本发明公开一种甲烷化反应