▎ 摘　　要

NOVELTY - Preparing monolithic catalyst comprises e.g. immersing polystyrene template in graphene-chloroplatinic acid aqueous solution, and vacuum-filling with vacuum pump until there are no air bubbles on the surface of the polystyrene immersed in solution, drying, electroplating, placing polystyrene template in a tube furnace, performing a program temperature roasting treatment under nitrogen conditions, using the catalyst precursor as cathode and platinum wire as anode, placing in electroplating solution, electroplating, washing and air-drying cathode, and placing the treated cathode in hydrogen-nitrogen mixed gas with an atmosphere of 5 wt.% hydrogen in a tube furnace, reducing the temperature to 600 degrees C for 2 hours, the flow rate of the mixed gas is 30 ml/minute, stopping heating, and aerating to room temperature. USE - The catalyst is useful for catalyzing carbon monoxide oxidation. ADVANTAGE - The catalyst has high mechanical strength, good thermal conductivity, high stability and strong water and carbon dioxide resistant property. DETAILED DESCRIPTION - Preparing monolithic catalyst comprises (i) preparing a three-dimensional network-shaped polystyrene template, where the template has a volume porosity of 60-75%, (ii) preparing graphene-chloroplatinic acid aqueous solution, (iii) immersing polystyrene template in graphene-chloroplatinic acid aqueous solution, and vacuum-filling with a vacuum pump until there are no air bubbles on the surface of the polystyrene immersed in solution, drying in an oven, repeating filling and drying 3-5 times to obtain filled conductive three-dimensional network-shaped polystyrene template, (iv) using the polystyrene template as a cathode, an inert graphite electrode as an anode, immersing the electrode in plating solution containing nickel, and electroplating by unipolar pulse plating, (v) placing polystyrene template in a tube furnace, performing a program temperature roasting treatment under nitrogen conditions: heating to 100 degrees C at a rate of 5 degrees C/minute for 0.5 hour, to 600 degrees C at a rate of 3 degrees C/minute for 12-24 hours, and removing the polystyrene template by pyrolysis to obtain template-free monolithic catalyst precursor, (vi) using the catalyst precursor as cathode and platinum wire as anode, placing in electroplating solution, which is an aqueous solution containing sodium sulfate and sulfuric acid, pH = 1-2, electroplating with a current density of 300-400 A/m2, at 40-50 degrees C for 1-2 hours, washing and air-drying cathode, and (vii) placing the treated cathode in hydrogen-nitrogen mixed gas with an atmosphere of 5 wt.% hydrogen in a tube furnace, reducing the temperature to 600 degrees C for 2 hours, the flow rate of the mixed gas is 30 ml/minute, stopping heating, and aerating to room temperature to obtain platinum-graphene/nickel-plated monolithic catalyst. An INDEPENDENT CLAIM is also included for monolith catalyst prepared by above method, where the catalyst includes three-dimensional network-shaped electroplated nickel support, and platinum and graphene components are supported on the support surface.