Slurry bed methanation catalyst, preparing method and application

Abstract

A slurry bed methanation catalyst contains the following components, by weight percentage: 5-40wt% of Ni, auxiliaries occupying 0-30wt% of Ni and 60-95wt% of gamma-Al203 carriers. The slurry bed methanation catalyst is used for slurry bed methanation process, and the reaction condition of the catalyst used for the slurry bed methanation process is that the reaction temperature is 280-320 DEG C, the reaction pressure is 1-4 MPa, the catalyst concentration is 1-10wt%, volume concentration of CO and CO2 in raw material gases is respectively 2-30%, and (H2-CO2) / (CO+CO2) is (2.5-3.7):1 according to molar ratio. The slurry bed methanation catalyst, the preparing method and application have the advantages that the slurry bed methanation catalyst is small and uniform in particle size, low-temperature activity of the slurry bed methanation catalyst in the methanation reaction is further improved by filling the auxiliaries, the slurry bed methanation catalyst has good catalytic methanation performance in a temperature range smaller than or equal to 320 DEG C, and the slurry bed methanation catalyst is applicable to the slurry bed methanation process.

Description

technical field [0001] The invention belongs to a catalyst and its preparation method and application, in particular to a supported nickel-based catalyst for slurry bed methanation, its preparation method and application. Background technique [0002] Natural gas is a clean, efficient and convenient high-quality energy. In recent years, with the acceleration of urbanization and the improvement of people's living standards, the gap in my country's demand for natural gas has gradually increased. my country has an energy structure that is rich in coal, poor in oil, and low in gas. Coal-to-synthetic natural gas is a clean and efficient coal conversion technology that is in line with my country's sustainable energy development. Coal-to-natural gas includes three steps of coal gasification, purification and methanation, among which methanation is the core technology of coal-to-natural gas, which refers to the CO and H in the synthesis gas 2 The process of synthesizing methane un...

AI Technical Summary

Problems solved by technology

[0007] The slurry bed methanation process overcomes many shortcomings of the industrial fixed bed methanation process, but due to the different reaction processes of the two processes, the catalyst structure and performance requirements are different, mainly in: (1) slurry bed methanation The process has good heat transfer performance. Under the condition that the carbon concentration in the feed gas is high and the single-pass conversion rate of carbon is above 90%, the bed can still be kept at the same temperature. Therefore, the catalyst is required to have a higher specific surface area, smaller and Uniform catalyst particle size and higher activity; (2) The slurry bed reactor requires external equipment stirring or turbulent mixing of raw material gas, which increases the wear of the catalyst, so there is a higher requirement for the strength of the catalyst; (3) Due to the limitation of the boiling point of inert liquid components, the reaction temperature of the slurry bed methanation process must be controlled below 320°C, so the catalyst is required to have higher low temperature reactivity

[0008] However, the slurry bed methanation processes disclosed in patents CN101979476A and CN101979475A all use industrial fixed bed methanation catalysts, and the catalyst particle size, strength and low-temperature reaction performance cannot better meet the requirements of the slurry bed methanation process, which greatly limits the Industrialization process of state-bed methanation process

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