▎ 摘　　要

NOVELTY - The method involves introducing carbon source gas and inert gas into a double-phase catalytic system formed by molten copper-bismuth alloy and molten salt not wetting a surface of graphene powder and not reacting with the copper-bismuth alloy. Air bubbles are generated in the system. Reacting and growing process is performed on graphene in the air bubbles to break for carrying the graphene powder floating on the molten salt surface to the gas-solid filtering and separating device through mixed gas flow after reaction. High quality large-diameter and small-layer graphene powder is obtained by adopting gas-solid separation. The molten salt is selected from manganese chloride, lithium chloride, sodium chloride, calcium chloride and magnesium chloride. The carbon source gas is selected from methane, ethane, propane, ethylene, propylene, natural gas, liquefied gas, acetylene, propyne and marsh gas. USE - Method for preparing high quality large diameter and small layer graphene powder. ADVANTAGE - The method enables directly obtaining high quality large diameter and small layer graphene powder with high yield, realize recycling repeatedly and resource maximum utilization and simplifying purification processing technique and reducing energy consumption and cost. DESCRIPTION OF DRAWING(S) - The drawing shows a graphical representation of a method for preparing high quality large diameter and small layer graphene powder. (Drawing includes non-English language text).