Methanation catalyst for fluidized bed and preparation method of methanation catalyst for fluidized bed

Abstract

The invention discloses a methanation catalyst for a fluidized bed and a preparation method of the methanation catalyst for the fluidized bed. The methanation catalyst for the fluidized bed comprises a carrier, an active component and auxiliary agents, and the active component and the auxiliary agents are loaded on the carrier. The carrier is a compound of Al2O3, ZrO2 and NiO or a compound of Al2O3, TiO2 and NiO; the active component is NiO; the auxiliary agents are oxides of at least one of Mg, Ca, La, Ce, Mn, Fe, Cu, Cr and Co. A co-precipitation method is adopted for preparation of the carrier of the catalyst, and uniformity in component distribution is realized; then spray forming is adopted to obtain the micro-spherical catalyst carrier which is high in fluidity and suitable for the fluidized bed. In preparation of the carrier of the catalyst, silicon sol or silicon-aluminum composite sol is added to serve as an adhesive; in a process of quick preparation of the micro-spherical carrier by spray forming, the silicon sol or silicon-aluminum composite sol is dispersed among carrier components, and after high-temperature calcination, the catalyst carrier is high in mechanical strength, abrasion resistance and impact resistance.

Description

technical field [0001] The invention relates to a methanation catalyst used in a fluidized bed and a preparation method thereof, belonging to the technical field of methanation catalysts. Background technique [0002] As a clean, environmentally friendly, and efficient energy source, natural gas accounts for an increasing proportion in my country's energy structure year by year. The contradiction between supply and demand has become increasingly prominent, and the degree of dependence on foreign countries has increased. my country is a "coal-rich, oil-poor, and gas-poor" country. The use of coal to synthesize natural gas and coke oven gas to synthesize natural gas is of great significance to optimize my country's energy structure, save energy and reduce emissions, and reduce environmental pollution. [0003] Methanation technology is the key technology for coal-to-synthetic natural gas and coke-oven gas-to-synthetic natural gas. The methanation reaction is a highly exotherm...

AI Technical Summary

Problems solved by technology

Chinese patent CN 104399482 A reports a bimetallic methanation catalyst whose carrier is crushed and calcined iron-containing natural ore and impregnated with Ni. The raw material of the catalyst is cheap and easy to obtain, and has strong wear resistance. The particle size is not uniform, and the fluidized state is not easy to control and unstable

The solution combustion method increases the pores and specific surface area of ​​the catalyst, and promotes the dispersion of active components in the carrier, but the mechanical strength and wear resistance of the prepared catalyst still need to be improved