▎ 摘　　要

NOVELTY - Preparing functionalized graphene supported noble metal nanocrystalline composite catalyst comprises adding graphite powder into a reactor, adding concentrated sulfuric acid under salted ice bath condition, then adding sodium nitrate and potassium permanganate into reactor, stirring, removing salted ice bath, placing the reactor under oil bath, cooling, adding hydrogen peroxide, filtering, washing with hydrochloric acid and deionized water, re-dispersing, centrifuging, freezing and drying to obtain graphite oxide, preparing sulfonic acid-modified graphene oxide, dispersing, washing and drying. USE - The method is useful for preparing functionalized graphene supported noble metal nanocrystalline composite catalyst (claimed). ADVANTAGE - The catalyst has good catalytic property even after using for 5 times. DETAILED DESCRIPTION - Preparing functionalized graphene supported noble metal nanocrystalline composite catalyst comprises: (i) adding 1-3 pts. graphite powder into a reactor, adding 80-100 pts. concentrated sulfuric acid under salted ice bath condition to disperse graphite, then adding 1-2 pts. sodium nitrate and 5-9 pts. potassium permanganate into the reactor, stirring for 2 hours, removing salted ice bath, placing the reactor under oil bath and gradually reacting to 80 degrees C for 6 hours, stopping heating, cooling to room temperature, adding 30% hydrogen peroxide until there is no gas, filtering the product, washing with hydrochloric acid and deionized water, re-dispersing, centrifuging, freezing and drying to obtain graphite oxide; (ii) adding 0.1-0.15 pts. graphite oxide and 3-5 pts. sodium p-aminobenzene sulfonate into 100-150 pts. deionized water, treating ultrasonically for 20-50 minutes, then adding 0.5-1.5 pts. nitrite catalyst under nitrogen protection, heating to 80 degrees C and refluxing for 18 hours, stopping reaction, centrifuging, washing, filter and drying to obtain sulfonic acid-modified graphene oxide; and (iii) adding 0.1-1.5 pts. sulfonic acid-modified graphene oxide into 100-150 pts. deionized water, adding 0.001-0.01 pts. noble metal precursor, dispersing ultrasonically for 20 minutes, then adding 0.01-0.1 pts. reducing agent, stirring for 12 hours, washing and drying.