Preparation method of methanol synthesis catalyst protective agent and application of methanol synthesis catalyst protective agent in gas purification device

The invention relates to the field of solid catalyst forming, and discloses a preparation method of a methanol synthesis catalyst protective agent and application of the methanol synthesis catalyst protective agent in a gas purification device. The method comprises the following steps: (1) mixing a first binder, optional first powder and optional liquid in a mixer to obtain seeds; (2) alternately spraying a second powder material and a second binder to the outer surfaces of the seeds under a rolling ball forming condition to form an outer layer, so as to prepare a formed product; and (3) roasting the molded product. The method is short in seed preparation time, good in repeatability and high in controllability, the prepared seeds are relatively uniform in particle size distribution, and after the methanol synthesis catalyst protective agent prepared by the method is reduced, the methanol synthesis catalyst protective agent has relatively high breakthrough sulfur capacity in different sulfur-containing atmosph