Protective agent for removing carbonyl iron and carbonyl nickel from synthetic gas and preparation method thereof

The invention belongs to the technical field of preparation of catalytic materials, and particularly relates to a protective agent for removing carbonyl iron and carbonyl nickel from synthetic gas and a preparation method thereof. The preparation method comprises the following steps: taking sodium carbonate (sodium bicarbonate), potassium carbonate (potassium bicarbonate) or ammonia water in an alkaline salt containing solution as a precipitator, mixing with a copper-zinc containing solution, carrying out co-precipitation to prepare parent slurry I, and controlling the final pH value to be 7.0 to 7.5; mixing aluminum nitrate with soluble salts such as Zn, Mg, Ca, Mn and the like, and performing co-precipitation with a precipitant to prepare slurry II; and mixing and pulping the slurry II and the slurry I, or directly washing the slurry II with deionized water, carrying out suction filtration, drying, roasting and forming to obtain a carbonyl-removing iron-nickel protective agent finished product. The carbonyl