▎ 摘　　要

NOVELTY - Acid-base bifunctional graphene-based nano heterogeneous catalyst comprises catalyst graphene oxide as carrier and amino group as surface modifier of graphene oxide. The catalyst has two-dimensional structure with thickness of 1-5 nm. USE - Acid-base bifunctional graphene-based nano heterogeneous catalyst. ADVANTAGE - The heterogeneous catalyst has surface with both acid and base active sites that are independent of each other to achieve individual catalytic effect without neutralizing each other, and have relatively high catalytic activity, thus improving reaction efficiency and reducing production costs. It has good chemical stability and good thermal stability. It has simple preparation and easy operation. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of acid-base bifunctional graphene-based nano heterogeneous catalyst by ultrasonically dispersing oxidized graphene in organic solvent; slowly adding sodium polyacrylate gel solution in organic silane coupling agent; introducing protective gas; heating mixed reaction system; filtering; and drying to obtain catalyst.