Preparation method for hollow molybdate composite microspheres and method for catalyzing ammonia borane hydrolysis to produce hydrogen

A method for preparing hollow molybdate composite microspheres, comprising steps of:

• (1) dissolving 1-4 mmol of MCl2 in 20 ml of water to obtain a solution A, and dissolving 1-4 mmol of molybdic acid in 20 ml of water to obtain a solution B, followed by mixing the solution A and the solution B to obtain a mixed solution C, in which M being at least one of Co, Ni, or Cu;
• (2) dissolving 10-40 mmol of urea in 40 ml of water, adding the mixed solution C of step (1) and stirring uniformly to obtain a solution D;
• (3) transferring the mixed solution D of step (2) into a reaction vessel and reacting at 120-160° C. for 6-12 hours to obtain product E;
• (4) carrying out suction filtration and water washing to the product E, followed by drying in a vacuum oven at 40-60° C. to obtain a solid;
• and
• (5) calcining the solid at 350-500° C. for 2 to 4 hours in a muffle furnace to obtain hollow molybdate composite microspheres.