▎ 摘　　要

NOVELTY - A nanocomposite material is obtained by directly loading platinum nanoparticles on graphene by wet chemical reduction method to obtain platinum and gallium oxide, using chemical vapor deposition (CVD), and forming surface layer of graphene etched by water vapor deposition. The nanocomposite material is confined by platinum of water-etched graphene. USE - Nanocomposite material used as catalyst for catalyzing selective dehydrogenation reaction of n-butane to produce butane (all claimed). ADVANTAGE - The nanocomposite material has excellent catalytic performance and selectivity, suppressed defect generation, and high conversion rate. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation of the nanocomposite material, which involves (i) ultrasonically dispersing graphene in ethylene glycol, adding chloroplatinic acid solution, adjusting the pH of the mixed solution to 11-12, cooling to room temperature after the reaction, adjusting the pH of the reaction solution to 3-4, filtering, washing and drying to obtain platinum and gallium oxide, (ii) adding platinum/gallium oxide and deionized water into two tube furnaces at the same time and connecting the two tube furnaces through a quartz tube by CVD method, pouring in inert argon at a flow rate of 100-120 mL/minute and purging for 20-30 minutes, heating the tube furnace containing platinum/gallium oxide and deionized water, passing the water vapor into the platinum/gallium oxide tube furnace through the quartz tube, keeping it warm to deposit the water vapor, etching the graphene surface of platinum/gallium oxide and cooling down to room temperature; and (2) application of the nanocomposite material.