Porous graphene preparation method

A method for preparing porous graphene, comprising steps of:

• 1) in the presence of a catalyst, conducting catalytic treatment on a biomass carbon source, to obtain a first intermediate product, the catalyst comprising one or more selected from the group consisting of chlorides of manganese, iron compounds, cobalt compounds and nickel compounds;
• 2) under a condition of a protective gas, heating the first intermediate product from a first temperature to a second temperature, and keeping the second temperature to obtain a second intermediate product, the first temperature being 20° C.˜40° C., and the second temperature being 300° C.˜400° C.;
• 3) under a condition of a protective gas, heating the second intermediate product from the second temperature to a third temperature, and keeping the third temperature to obtain a third intermediate product, the third temperature being 800° C.˜900° C.;
• 4) under a condition of a protective gas, heating the third intermediate product from the third temperature to a fourth temperature, and keeping the fourth temperature to obtain a fourth intermediate product, the fourth temperature being 1,100° C.˜1,300° C.;
• and
• 5) under a condition of a protective gas, cooling the fourth intermediate product from the fourth temperature to a fifth temperature, and keeping the fifth temperature to obtain the porous graphene, the fifth temperature being 900° C.˜1,000° C.