▎ 摘　　要

NOVELTY - Solid catalyst comprises graphene oxide and melamine, where the melamine is obtained after stably stabilizing the surface of the graphene oxide by conventional liquid phase impregnation treatment. USE - The catalyst is useful for Knoevenagel condensation (claimed). ADVANTAGE - The method is simple and economical. The catalyst has good re-usage performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing catalyst, comprising taking graphene oxide and melamine in a ratio of 7:1-20:1, immersing at 20-80 degrees C using solvent e.g. deionized water, ethanol or dimethyl sulfoxide, where the mass ratio of solvent to graphene oxide is 100:1-300:1, ultrasonically treating at 30-80 degrees C for 30-90 minutes, immersing for 12-24 hours under mechanical agitation, filtering at the end of the impregnation, washing, and drying.