▎ 摘　　要

NOVELTY - The sealed reactor method involves sonicating a first mixture provided with fly ash, a pyridinium salt and a solvent to form a dispersed mixture. The dispersed mixture is reacted with a polymer-supported oxidizing agent to form a second mixture at a temperature in a range of from 10 to 50degrees C. A gaseous mixture provided with CH4 and H2 is bubbled through the second mixture in a sealed reactor at a temperature of 120 to 180degrees C. The gaseous mixtures are provided with 1 vol. % CH4 and 10 vol. % H2 , to form graphene on the fly ash. the reacting occurs for a duration in a range of from 15 to 180 minutes. USE - Sealed reactor method for forming graphene that is used in the field of optoelectronic devices such as flat panels, conducting transparent electrodes, and supercapacitors. ADVANTAGE - The method enables to form graphene on fly ash, which has high Raman 2D and G peak intensity ratio, and high yield of graphene.