▎ 摘　　要

NOVELTY - Graphene composite material comprises graphene composite metal oxides and graphene composite metal hydrides. The hydrogen is introduced through metal hydride topological reduction to form graphene composite oxyhydrogen compounds. The metal bases introduced through metal compound solutions to form catalytic active metal-based graphene composite oxygen and hydrogen compounds. USE - The graphene composite material is useful for ammonia synthesis catalyst. ADVANTAGE - The graphene composite material develops a new catalytic material with stable and efficient synthetic ammonia, obvious economic benefit relative to the traditional noble metal catalyst, high catalytic activity, can realizes multiple times of synthesis rate compared with conventional ammonia synthesis, and is good for the control of the reaction. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the material, comprising (i) using benzene and metal-based oxide as raw materials to volatilize benzene and metal-based oxide by heating in a tube furnace, under the protection of a vacuum reactor and a nitrogen atmosphere, controlling the reaction temperature to be 400-600 degrees C, and synthesizing vacant graphene by high-temperature pyrolysis; (ii) mixing metal oxideand metal hydride in the atmosphere filled with N2, mixing metal oxide and metal hydride in a vacuum sealed quartz tube under the temperature condition of 400-700 degrees C, where the molar ratio of the metal oxide and the metal hydride is (1):(2.5-3.5), sealing the vacant graphene, metal oxide and metal hydride in a evacuated heat-resistant glass tube, and reacting to obtain the initial reaction product of the graphene composite material; (iii) washing the graphene composite material reaction primary product by NH4Cl/methanol to obtain the graphene composite material powder by vacuum drying; (iv) mixing the metal hydride with the graphene composite material powder under the environment of full nitrogen or argon gas atmosphere protection, placing in a steel reactor and preparing to obtain graphene composite oxygen compound; and (v) adding the graphene composite oxygen compound into the metal compound solution, stirring for 2-5 hours at room temperature, removing the solvent part of themetal compound solution under the vacuum heating, collecting the metal-based graphene composite oxygen compound powder, sealing in a thermoluminescence tube under vacuum; and heating at 550-800 degrees C at a speed of 1.7 degrees C/minute in the heating furnace for 2-5 hours and preparing to obtain the graphene composite material.