Catalyst for complete methanation of synthesis gas from coal and preparation method thereof

Abstract

The invention discloses a catalyst for the complete methanation of synthesis gas from coal and a preparation method thereof. The catalyst is prepared by using NiO as an active component, one or two of rare earth metal oxides La2O3, CeO2 and Sm2O3 as a first assistant, one of alkali oxides CaO, BaO and SrO as a second assistant, and magnesium aluminate spinel formed by mixing Al2O3 with MgO as a carrier, and the obtained catalyst contains the ingredients in percent by mass as below: 20% to 70% of NiO, 15% to 50% of Al2O3, 6% to 30% of MgO, 5% to 20% of the rare earth metal oxide-type first assistant, 1% to 8% of the alkali oxide-type second assistant and 1% to 3% of graphite; the catalyst provided by the invention has the advantages of high catalytic activity, high mechanical strength, good thermal stability, strong carbon deposition resistance, strong resistance to toxicants in feed gas, excellent low temperature activity and low cost.

Description

technical field [0001] The invention belongs to the technical field of methanation catalysts, in particular to a catalyst used in the complete methanation of carbon monoxide in coal-to-synthesis gas to synthesize natural gas and a preparation method thereof. Background technique [0002] my country is relatively rich in coal resources. For a long time, coal has occupied a major position in my country's primary energy consumption structure. However, the use of coal often causes a large amount of sulfur oxides, nitrogen oxides and dust pollution. In today's environment where environmental protection is emphasized and energy conservation and emission reduction are advocated, efficient and clean conversion of coal is in line with the clean utilization of coal and the requirements of sustainable development. [0003] Compared with technologies such as coal-to-methanol, coal-to-dimethyl ether, coal direct liquefaction, and coal indirect liquefaction, coal-to-synthetic natural gas...

AI Technical Summary

Problems solved by technology

Therefore, the current methanation catalysts are not suitable for coal-to-natural gas projects, and there is also a lack of operating experience in the complete methanation process of coal-to-synthesis gas. It is necessary to carefully study the applicable range of catalysts during the inspection.

However, the number of complete methanation catalysts suitable for coal-to-natural gas projects is relatively small, and most of them have not been verified by large-scale projects, especially the stability of long-term operation under harsh conditions of high temperature (above 600°C) and high pressure (above 3MPa). still needs optimization

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