Protective agent for methanol synthesis catalyst and preparation method and application thereof

The invention relates to the technical field of preparation of catalytic materials, in particular to a protective agent of a methanol synthesis catalyst and a preparation method and application thereof.The protective agent comprises a carrier and active components, the active components comprise CuO and ZnO, the carrier comprises Al2O3, SiO2 and M2Ox, M is selected from at least one of B, Ge, As, Sb, Tb and Po, x is the valence of M, and x is larger than or equal to 1 and smaller than or equal to 2. The carrier in the protective agent is modified, so that the activity of the active component and the adsorption capacity of carbonyl iron and carbonyl nickel can be improved, and the protective agent has no activity on methanol in the methanol synthesis process, so that the long-period operation of the methanol synthesis catalyst can be protected; and the device is particularly suitable for being used in a medium-low pressure methanol synthesis large-scale device. 本发明涉及催化材料制备技术领域，具体涉及甲醇合成催化剂的保护剂及其制备方法和应用，所述保护剂包括载