Application of raney nickel as slurry reactor to synthesize methane catalyst

Abstract

The invention provides the application of raney nickel as a slurry reactor to synthesize a methane catalyst, including: adding a raney nickel catalyst dispersed in an inert liquid medium to a reactor for a methanation reaction, feeding product gas and raw material gas to a separator, discharging a liquid phase component I composed of the liquid phase component and the catalyst component in the product gas from the bottom of the separator I, discharging gas phase I from the top of the separator, discharging a part of the inert liquid medium containing the catalyst from the middle of the reactor into a separator II, discharging gas phase II from the top of the separator II, mixing the gas phase II with the gas phase I to get a natural gas product, discharging the inert liquid medium of the catalyst from the bottom of the separator II to mix with the liquid phase component I to get a mixture, and feeding the mixture and the fresh methanation catalyst dispersed in the inert liquid medium together into the reactor for the methanation reaction. The application has the advantages that the raney nickel catalyst does not need reduction, has high mechanical strength and good wear resistance, and can satisfy the requirement of slurry reactor methanation process for low temperature activity.

Description

technical field [0001] The invention belongs to the use of Raney nickel (Raney-Ni), in particular to the application of Raney nickel as a slurry bed methanation catalyst. Background technique [0002] my country is rich in coal, poor in oil, and low in gas energy, so the comprehensive optimization and utilization of coal resources is imminent. Coal-to-synthetic natural gas can not only meet the current growing demand for clean energy, but also play an irreplaceable role in the rational utilization and optimal allocation of domestic coal resources. Methanation is the core technology of coal-to-natural gas, the reaction refers to CO or CO 2 Synthesis of CH by hydrogenation under the action of catalyst 4 and H 2 O, the reaction formula is as follows: [0003] CO+3H 2 =CH 4 +H 2 O+206KJ / mol (1) [0004] CO 2 +4H 2 =CH 4 +2H 2 O+165KJ / mol (2) [0005] At present, the coal-to-natural gas technologies in the world mainly include LURGI in Germany, DAVY in the UK and Top...

AI Technical Summary

Problems solved by technology

However, the slurry bed methanation process and the fixed bed process have different requirements on the catalyst, so the use of industrial fixed bed catalysts in the slurry bed methanation reaction has many disadvantages, which are specifically reflected in: (1) the particle size of the catalyst required by the slurry bed Smaller and more uniform, but the fixed bed methanation catalyst has a large particle size, so the industrial catalyst needs to be broken, which will lead to the destruction of the pore structure of the catalyst; (2) the industrial fixed bed methanation catalysts are all supported nickel-based catalysts, Must pass H before reacting 2 For reduction, the reduction temperature is as high as 400-600°C, but the inert components in the slurry bed methanation process have a low boiling point and are easy to decompose at high temperature; (3) Due to the limitation of the boiling point of the inert components, the slurry bed methanation process Catalysts are required to have higher low-temperature activity, but the reaction temperature of fixed-bed methanation catalysis is high; (4) The slurry-bed methanation reactor needs external equipment stirring or turbulent mixing of feed gas, which increases the wear of the catalyst, Therefore, the mechanical strength of the catalyst is required to be higher

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