Method for preparing methanation catalyst with low temperature, high activity and high thermal conductivity

Abstract

The invention discloses a method for preparing a methanation catalyst with low temperature, high activity and high thermal conductivity, which comprises the following steps: high-speed stirring and ultrasonic dispersion of nano heat-conducting materials in a salt solution to form a suspension, and raising the temperature to 50-80°C for heat preservation and standby Disperse the precursor salt in deionized water to form a precursor salt solution, raise the temperature of the precursor salt solution and the precipitant solution to 50-80°C respectively, and add them dropwise to the suspension for precipitation reaction and continue Stirring; after the dropwise addition, aging is carried out, and the precipitate obtained after aging is press-filtered, beaten, washed, dried, and roasted to obtain catalyst powder; adding lubricant and forming aids to the catalyst powder, ball milling and sieving, and then passing through The molded catalyst is obtained after granulation, sieving, tableting, curing and roasting. The process is simple, easy to operate, low in production cost, and the prepared catalyst has good thermal conductivity, high heat transfer efficiency, good low-temperature reactivity and good high-temperature thermal stability.

Description

technical field [0001] The invention relates to a method for preparing a catalyst, in particular to a method for preparing a methanation catalyst with low temperature, high activity and high thermal conductivity. Background technique [0002] In the process of coal-to-natural gas production, the domestic commercial operation of Datang Keqi, Xinjiang Qinghua, and Inner Mongolia Huineng all adopt imported technologies. The key technology is methanation catalyst. Because the methanation reaction is characterized by strong exothermicity, the reaction generates water. , the high concentration of carbon monoxide increases the adiabatic temperature in the reactor, which requires the catalyst to have strong anti-sintering performance and hydrothermal resistance. In addition, the adiabatic temperature rise caused by the reaction of high concentration carbon monoxide in the adiabatic reactor is large. If no effective measures are taken, the equipment will be overheated and the catalys...

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Problems solved by technology

This extrusion process will lead to uneven mixing of raw materials, resulting in uneven heat conduction and difficult control of active components; there are also literatures disclosing the use of silicon carbide for direct loading, but the specific surface area of ​​the catalyst is small and the low-temperature activity is not good. Problem, the catalyst is only suitable for high temperature methanation process, and it is an adiabatic reactor