Completely-methanated catalyst as well as preparation method and application thereof

Abstract

The invention provides a completely-methanated catalyst as well as a preparation method and an application thereof. The preparation method comprises the following steps of: respectively mixing precursors of an active component, a first auxiliary agent and a second auxiliary agent and dissolving into water to prepare a solution I; adding a precipitating agent into water to be dissolved to respectively prepare a solution II and a solution II'; adding a precursor of a carrier into the water to be dissolved to prepare a solution III or a solution III'; adding the solution I into the solution II to carry out precipitation to obtain a precipitating system I; adding the solution II' into the solution III to carry out the precipitation to obtain a precipitating system II or adding an acidic solution into the solution III' to peptize to obtain the precipitating system II; and then mixing the precipitating system I with the precipitating system II. According to the completely-methanated catalyst as well as the preparation method and the application thereof, the catalyst is prepared by applying a sub-step reverse precipitating method; and the catalyst has the characteristics of high activity and high safety and is suitable for being applied to a high-temperature or low-temperature completely-methanated reaction process for synthesizing natural gas by coal gasification through methanation.

Description

technical field [0001] The invention relates to a complete methanation catalyst and its preparation method and application, especially a complete methanation catalyst for producing coal-based synthetic natural gas, its preparation method and application, and belongs to the field of catalyst chemistry and new coal chemical energy of coal-based synthetic natural gas . Background technique [0002] The sustainable development of my country's environment, ecology and society has an increasing demand for clean energy utilization, especially in recent years, the market demand for natural gas has been increasing at a relatively high speed. It is predicted that by 2020, my country's natural gas market demand will reach 4500 billion cubic meters, the market gap is 250 billion cubic meters, and the degree of external dependence will reach 50%. At the same time, the current situation of my country's rich coal and low gas resources makes the clean utilization of coal more and more urgen...

AI Technical Summary

Problems solved by technology

Patent CN102091631A uses multiple impregnation methods to prepare a methanation catalyst for the production of synthetic natural gas, but the methanation catalyst prepared by the impregnation method may have insufficient stability under high temperature conditions

Although there have been reports on the complete methanation catalysts for the production of synthetic natural gas prepared by different methods at home and abroad, especially in China, there is no technology that has been tested for long-term industrial application under high-temperature hydrothermal reaction conditions.

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