▎ 摘　　要

NOVELTY - Preparing graphene-supported iron-aluminum composite magnetic catalyst involves dispersing oxidized graphite in a polar solvent for 1-10 hours, followed by adding aluminum nitrate hexahydrate, iron salt and nitrogen-containing reagent are continuously dispersed for 1-10 hours and then adding 1-methyl-2-pyrrolidone to obtain mixture. The obtained mixture is heated in a high-pressure kettle, then cooled, centrifuged, washed and dried to obtain catalyst precursor. USE - Method for preparing graphene-supported iron-aluminum composite magnetic catalyst (claimed). ADVANTAGE - The method enables to prepare graphene-supported iron-aluminum composite magnetic catalyst is cost effective and has reduced separation cost of the reaction solution and the catalyst. The catalyst has good performance and suitable for industrial production. DETAILED DESCRIPTION - Preparing graphene-supported iron-aluminum composite magnetic catalyst involves dispersing oxidized graphite in a polar solvent for 1-10 hours, followed by adding aluminum nitrate hexahydrate, iron salt and nitrogen-containing reagent are continuously dispersed for 1-10 hours and then adding 1-methyl-2-pyrrolidone to obtain mixture. The obtained mixture is heated in a high-pressure kettle, then cooled, centrifuged, washed and dried to obtain catalyst precursor. The obtained catalyst precursor is heated in a tubular furnace to obtain graphene-supported iron-aluminum composite magnetic catalyst. An INDEPENDENT CLAIM is included for a method for preparing benzaldehyde, which involves : (A) using hydrogen peroxide as oxidant to oxidize the reaction of benzyl alcohol in acetonitrile with hydrogen peroxide as an oxidizing agent; and (B) reacting the post-treatment to obtain benzaldehyde.