Coke-oven gas methanation catalyst and preparation method and application thereof

Abstract

The invention provides a coke-oven gas methanation catalyst and a preparation method and application of the coke-oven gas methanation catalyst. The coke-oven gas methanation catalyst is prepared from an active component Ni which accounts for 5 percent to 50 percent of the total mass according to the mass of a metal element, an addition agent which accounts for 1 percent to 40 percent of the total mass according to the mass of an oxide, and the balance of a carrier Al2O3. The preparation method of the coke-oven gas methanation catalyst comprises the following steps: (1) preparing a solution I from the Ni, the addition agent and an Al precursor; (2) preparing a precipitant solution, and adding a surfactant to prepare a solution II; (3) mixing the solution I and the solution II in a parallel flow manner, and carrying out ultrasonic precipitation; (4) washing sediment, filtering, drying, granulating and roasting to obtain powder; (5) adding a pore expanding agent, graphite and a binding agent into the powder, molding and then roasting. The preparation method provided by the invention applies a parallel flow precipitation method, which introduces ultrasonic waves and the surfactant. The active component and carrier component of the catalyst have a strong systematic effect, and the catalyst has the advantages of high activity, high-temperature hydrothermal stability and wide active temperature region, so that the catalyst is particularly suitable for a multi-section coke-oven gas methanation process.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a coke oven gas methanation catalyst and its preparation method and application. Background technique [0002] my country is a big coking country. In 2014, the coke output exceeded 470 million tons, and a large amount of coke oven gas was produced. Calculated on the basis of 400 cubic meters of coke oven gas produced per ton of coke, my country's annual coke oven gas production reached 168 billion cubic meters. In such a huge About 55% of the coke oven gas is used for power generation, hydrogen production, methanol synthesis, and ammonia synthesis, and a considerable part is discharged directly, which wastes precious resources and causes great environmental pollution. [0003] The main component of coke oven gas is 55-60% H 2 , 23-27%CH 4 , 5 ~ 8% CO, 2 ~ 4% C m h n , 0.5-1% benzene, 4-5% water, and a small amount of N 2 , CO 2 and O 2 . Coke oven gas methana...

AI Technical Summary

Problems solved by technology

The methanation catalyst prepared by the impregnation method may have the problem of poor high temperature hydrothermal stability

In addition, the overall effect of the prepared methanation catalyst applied in multi-stage methanation process conditions has not been described in the prior art

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