Preparation method of catalyst for preparing substitute natural gas from synthetic gas

The invention belongs to the technical field of catalysis, and relates to a preparation method of a catalyst for preparing substitute natural gas from synthetic gas. The preparation method comprises the following steps: mixing alumina (or pseudo-boehmite) with soluble salt of magnesium, adding ionized water, fully mixing above materials until uniformity, disposing the obtained mixture for a certain time, drying the disposed mixture, roasting the dried mixture, crushing the roasted mixture, adding a binder, granulating the obtained mixture, drying the granulated mixture, carrying out press molding, roasting the molded mixture to prepare a catalyst carrier, and loading an active component and an assistant to the carrier through an immersion technology to prepare the catalyst. The catalyst carrier prepared through the method has good hydrothermal stability and has a water absorption rate of 40-45%, and the catalyst prepared through adopting the catalyst carrier and used for preparing substitute natural gas from synthetic gas is suitable for a methanation reaction under a high CO content at a high reaction temperature, and can effectively prevent carbon deposition and inhibit a carbonylation reaction.