Co-P-B/ZIF-67催化剂的制备及催化硼氢化钠水解制氢性能研究  

Study on preparation of Co-P-B/ZIF-67 catalyst and catalyzing hydrogen production from sodium borohydride hydrolysis

作　　者：李洁轩 靳惠明[1] LI Jiexuan;JIN Huiming(School of Mechanical Engineering,Yangzhou University,Yangzhou 225100,China)

机构地区：[1]扬州大学机械工程学院,江苏扬州225100

出　　处：《无机盐工业》2024年第12期150-158,共9页Inorganic Chemicals Industry

摘　　要：传统的化石能源通常会造成环境污染且不可再生,氢能作为一种无污染且可再生的能源,应当大力发展。采用化学还原法制备了Co-P-B/ZIF-67催化剂,通过透射电子显微镜(TEM)、X射线衍射仪(XRD)和比表面及孔径分析仪来研究催化剂的表面形态、晶体结构、比表面积和孔径分布,用硼氢化钠溶液的水解制氢速率检验催化剂的催化性能。加入适量的ZIF-67,催化剂依旧能保持非晶态结构,适量的负载量可以分散Co-P-B纳米粒子,可以减小催化剂的粒径使其比表面积明显增大,从而催化剂的性能得到改善。与未负载的Co-P-B相比,Co-P-B/ZIF-67催化剂活性更高,氢气产生速率为8946.3 mL/(min·g),平均粒径更小(26.74 nm),比表面积更大(136.8 m^(2)/g),循环性能更好,经过5次循环,催化剂还保持初始活性的76.3%,活化能更低(27.1 kJ/mol)。此外,还研究催化剂用量、氢氧化钠浓度、硼氢化钠浓度和反应温度对催化反应影响。结果表明,Co-P-B/ZIF-67催化剂在硼氢化钠水解制氢方面很有前景。Traditional fossil fuels typically cause environmental pollution and are nonrenewable.As a pollutionfree 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 8946.3 mL/(min·g),an average particle size of 26.74 nm,a larger specific surface area of 136.8 m^(2)/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.

关 键 词：硼氢化钠 水解制氢 Co-P-B ZIF-67 

分 类 号：TQ138.12[化学工程—无机化工]