Method for rapidly preparing methanation catalyst by microwave calcination

Abstract

The present invention relates to the field of coal conversion and catalysis, in particular to a method for rapidly preparing a methanation catalyst by microwave calcination. The method comprises the steps of: (1) mixture preparation: mixing silicon dioxide, active carbon powder and nickel nitrate homogeneously to obtain a homogeneous mixture; and storing the homogeneous mixture in a dry environment at the temperature of 100 DEG C; and (2) catalyst preparation: 1) high pressure tabletting, and 2) microwave preparation. The silicon carbide carrier provided by the present invention has characteristics of good high-temperature thermal stability, good thermal conductivity, high mechanical strength and the like, can avoid heat accumulation of the catalyst bed, prolongs life time of the catalyst, and can support higher reaction temperature and space velocity. Furthermore, by the method provided by the present invention, preparation processes in the prior art are simplified, a coating is not introduced, higher nickel loading amount can be obtained, and loss of active components caused by the reason that the coating in the coating type whole catalyst peels off can be avoided.

Description

technical field [0001] The invention relates to the field of coal conversion and catalysis, in particular to a method for rapidly preparing a methanation catalyst by microwave roasting. Background technique [0002] It is a new way to produce natural gas through CO methanation reaction using coal-to-synthesis gas as raw material, but the industrial catalysts for CO methanation have been monopolized by foreign countries, so it is urgent to develop efficient CO methanation catalysts. At present, the carrier of domestic methanation catalysts is mostly aluminum oxide. Due to the limitation of the preparation process in application, it is difficult to adjust the performance of the catalyst, the anti-coking effect is not good, and the catalyst is easy to sinter at high temperature. The patent CN201210003109 using aluminum oxide as the carrier adopts the equal impregnation method to load the active component Ni on the aluminum oxide carrier, but the preparation process is cumbersom...

AI Technical Summary

Problems solved by technology

At present, the carrier of domestic methanation catalysts is mostly aluminum oxide. Due to the limitation of the preparation process in application, it is difficult to adjust the performance of the catalyst, and the anti-coking effect is not good. The catalyst is easy to sinter at high temperature.

The patent CN201210003109 using aluminum oxide as the carrier adopts the equal impregnation method to load the active component Ni on the aluminum oxide carrier, but the preparation process is cumbersome and requires repeated impregnation; the composite carrier with aluminum oxide and titanium dioxide Patent CN201410790610, the catalyst preparation process is also cumbersome, which is not conducive to large-scale production; in order to improve the activity of the catalyst, the patent CN201310449697 uses the noble metal ruthenium as the catalytic active component. This method undoubtedly increases the production cost, and it is difficult to promote it to industrial applications.

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