Method for preparing catalyst for coke-oven gas methanation

Abstract

The invention relates to a method for preparing a catalyst for coke-oven gas methanation, which belongs to preparation aiming at the practical application condition of the coke-oven gas methanation. The catalyst uses Gamma-phase alumina as a carrier, silicon carbide as a wave-absorbing material, nickel oxide as an active ingredient and cerium oxide as an auxiliary agent, the grinding, the sieving, the solid-phase mixing, the microwave heating and the calcining decomposition are adopted, the sage green powder solid catalyst is finally synthesized, the content of the product active component ofthe nickel oxide is 19.67 percent, the crystal grain diameter is smaller than or equal to 100nm, in addition, the dispersion is uniform, and the methanation can be fast completed through the mixing with coke-oven gas, so the coke-oven gas is better applied. The preparation method has the advantages that the process is advanced, the flow process is short, the operation is simple and convenient, the preparation time is short, the energy consumption is low, the material proportion is reasonable, the data is full and accurate, the product stability is good, the methanation of the coke-oven gas under the condition of supplementing the carbon dioxide can be realized, and the method belongs to an ideal method for preparing the catalyst for the coke-oven gas methanation.

Description

technical field [0001] The invention relates to a method for preparing a catalyst for coke oven gas methanation, belonging to the technical field of coke oven gas methanation preparation and application. Background technique [0002] Coke oven gas is a mixed gas produced after coal dry distillation in the coke production process. The main components include hydrogen gas 55.0-60.0%, methane gas 23.0-27.0%, carbon monoxide gas 5.0-8.0%, carbon dioxide gas 2.0-4.0%, nitrogen gas 2.0-6.0% %, ethane ethylene gas 1.4-3.0%, oxygen 0.3-0.8% and a small amount of impurities, the general coking gas production per ton is 350NmZ 3 , one half of which is returned to the furnace for self-use, and its calorific value is 17-19MJ / Nm 3 ; China is a big coke producer. Coke oven gas is mainly used for ammonia production, methanol production, hydrogen production and power generation. About 15% of it is directly put into the air or burned and discharged. The coke oven gas discharged into the atm...

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Problems solved by technology

[0003] Coke oven gas combustion emission or direct emission is a very serious problem, which not only wastes resources, but also pollutes the environment. How to use this resource and transform it is a very important research topic, such as CN1919985A, CN1935956A, CN1952082A, CN1952083A, CN1952084A , CN101391935A, CN101607859A, CN101649232A, and US4318997 patents all disclose the method for preparing synthetic natural gas by catalytic methanation reaction of coke oven gas, and CN101100622A and CN101597527A disclose supplementing CO into coke oven gas 2 The method for preparing synthetic natural gas by catalytic methanation, CN101391218A discloses a coke oven gas direct methanation catalyst, but these methods all have technical deficiencies, the preparation process is complicated, the time is long, the energy consumption is high, the method is relatively backward, and cannot meet the requirements of coke oven gas. High Performance Use of Furnace Gas for Methanation Reactions with Supplemented Carbon Dioxide

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