Preparation method and application of catalyst

The invention relates to the technical field of rare earth, in particular to a preparation method and application of a catalyst. The preparation method of the catalyst comprises the following steps: 1) weighing cerous sulfate and dissolving in water to obtain a solution A, weighing potassium hydroxide, dissolving the potassium hydroxide in water to obtain a solution B, pouring the solution B into the solution A, and carrying out hydrothermal synthesis to obtain cerium dioxide; 2) centrifugally washing the cerium dioxide obtained in the step 1), and performing drying, grinding and calcining to obtain a catalyst carrier; 3) preparing a nickel sulfate solution, dropwise adding ammonia water, adjusting the pH value of the solution to 11 to obtain a mixed system, dipping the catalyst carrier prepared in the step 2) in the mixed system solution of nickel, and performing washing, drying, grinding and roasting to obtain Ni/CeO2; and 4) preparing a rare earth salt solution, dipping the Ni/CeO2 prepared in the step 3)