Preparation method of wide-temperature methanation catalyst

Abstract

The invention provides a preparation method of a wide-temperature methanation catalyst. The wide-temperature methanation catalyst comprises the following components in percentage by mass: 5-75% of a carrier, 10-90% of NiO as an active constituent and 1-50% of a metal oxide adjuvant. In the preparation method, the wide-temperature methanation catalyst is obtained in a way of combining a precipitation process and an impregnation method. The obtained catalyst has good methanation activity in a wide-temperate range of 260-800 DEG C, stable performance, long service life and strong practicality, so that the catalyst is suitable for the application in a diversified coal methane industry.

Description

technical field [0001] The invention relates to the field of methanation of carbon oxides, in particular to a wide-temperature methanation catalyst and a preparation method thereof. Background technique [0002] In recent years, with the concern of the international community on the issue of global warming and the accelerated pace of energy conservation and emission reduction in my country, the coal-based gaseous energy industry has begun to receive widespread attention. Among them, the coal-to-methane process has the characteristics of high utilization rate of heat energy, and has become an important direction of the coal-based gaseous energy industry. my country has a vast territory and abundant coal reserves. Relatively speaking, oil and natural gas reserves are very insufficient. Therefore, coal-to-gas methane conforms to my country's special energy structure of "rich in coal and lack of oil and gas", and is also an effective way to solve the extensive utilization of co...

AI Technical Summary

Problems solved by technology

The advantage of the catalyst prepared by the impregnation method is: due to the extremely fast methanation reaction, the active component nickel should be distributed on the surface of the catalyst. The temperature is low, and the catalytic activity is good at low temperature; the disadvantage is that the Ni content of the catalyst obtained by impregnation is low, and it is not suitable for high-concentration CO conversion

The advantages of the catalyst prepared by the co-precipitation method are: uniform dispersion of components, high catalyst strength, strong thermal stability and anti-sintering performance, and good catalytic activity at high temperatures; the disadvantage is: a large number of active components Ni and Al 2 o 3 Close combination makes the content of Ni distributed on the surface of the carrier less, so the catalyst has poor activity at low temperature of 260°C-400°C, and the catalyst reduction temperature is high, which increases the difficulty and cost of reduction,

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