▎ 摘　　要

NOVELTY - A phosphorus-nitrogen co-doped graphene-supported palladium-based catalyst comprises phosphorus-nitrogen co-doped graphene material as a catalyst carrier. The noble metal palladium is loaded on the carrier in a highly dispersed manner. The loading amount of palladium in the catalyst is 1-5 wt.%. USE - Phosphorus-nitrogen co-doped graphene-supported palladium-based catalyst for catalytic decomposition of formic acid to produce hydrogen and preparing acid-alkali compound (all claimed). ADVANTAGE - The phosphorus-nitrogen co-doped graphene-supported palladium-based catalyst with easy-to-obtain raw materials, and high catalytic efficiency, by simple and convenient process. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation method of phosphorus-nitrogen co-doped graphene-supported palladium-based catalyst, which involves (1) adding phosphorus-nitrogen co-doped graphene material to deionized water, ultrasonically processing for 5-30 minutes, adding palladium precursor solution having palladium with concentration of 1-4.2 %mass to obtain unreduced catalyst, where the mass-volume ratio of graphene material, deionized water and palladium is 0.5 g:100 ml:(10-30) mg, and (2) stirring the unreduced catalyst in step (1) for 4-12 hours, adding 10-20 ml 1 M/L sodium borohydride solution, continuously stirring for 1-2 hours, filtering, washing, and vacuum drying, where the molar ratio of palladium to sodium borohydride is 1:(20-60); and (2) use of phosphorus-nitrogen co-doped graphene-supported palladium-based catalyst in catalytic decomposition of formic acid to produce hydrogen.