Method for preparing nano magnetic silicon dioxide immobilized platinum catalyst by one-pot method

The invention relates to the technical field of synthesis of a catalyst, and particularly discloses a method for preparing a nano magnetic silicon dioxide immobilized platinum catalyst by a one-pot method. The method comprises the following steps: (1) dissolving sodium dodecyl benzene sulfonate and xylene to prepare an oil phase; the preparation method comprises the following steps: dissolving FeCl3. 6H2O, FeSO4. 7H2O and deionized water to prepare a water phase; dropwise adding the water phase into the oil phase, and stirring for 1-2 hours to obtain a reversed-phase micelle emulsion; (2) keeping the temperature of the reaction liquid at 60-100 DEG C for 45-90 minutes under the protection of nitrogen, then adding hydrazine hydrate, and reacting for 3-8 hours; (3) adding tetraethoxysilane and vinyltriethoxysilane at the temperature of 30 to 60 DEG C, and reacting for 18 to 48 hours; (4) adding a tetraammineplatinum nitrate solution at 50-65 DEG C, and reacting for 4-12 hours; and (5) adding a demulsifier, coll