Abstract:

Traditional fossil fuels typically cause environmental pollution and are non-renewable.As a pollution-free and renewable energy source，hydrogen energy should be vigorously developed.Co-P-B/ZIF-67 catalysts were prepared by chemical reduction method.The surface morphology，crystal structure，specific surface area and pore size distribution of the catalyst were researched through transmission electron microscopy，X-ray powder diffractometer and specific surface and pore size analyzer.The performance of the catalyst was reflected by the hydrogen production rate.The catalyst still maintained an amorphous structure with the addition of an appropriate amount of ZIF-67.An appropriate loading amount could disperse Co-P-B nanoparticles，reduce the particle size of the catalyst，significantly increase the specific surface area，and improve the performance of the catalyst.Compared with Co-P-B，the Co-P-B/ZIF-67 catalyst had higher activity，with a hydrogen production rate of 8 946.3 mL/（min·g），an average particle size of 26.74 nm，a larger specific surface area of 136.8 m²/g，and better cycle performance.After 5 cycles，the catalyst still maintained 76.3% of the initial activity，with a lower activation energy of 27.1 kJ/mol.The effects of catalyst dosage，sodium hydroxide concentration，sodium borohydride concentration and reaction temperature on the catalytic reaction were also investigated.The results indicated that the Co-P-B/ZIF-67 catalyst was a promising hydrogen production catalyst for sodium borohydride hydrolysis.

Key words: sodium borohydride, hydrogen production, Co-P-B, ZIF-67