摘要
合成了蜂窝状的分级多孔碳,并以多孔碳为载体通过浸渍-化学还原法制备碳载镍(Ni/C)作为催化氨硼烷水解制氢的催化剂。采用XRD、BET、SEM、Raman、TEM等手段对样品进行了表征并研究了Ni/C室温催化性能。结果显示,多孔碳比表面积高达737 m2·g^(-1),具有部分石墨化结构;负载的非晶态镍纳米颗粒平均粒径约为10 nm,均匀分布在碳基材。碳载镍对氨硼烷水解反应具有良好的催化活性,镍负载量为30wt%时催化性能最佳,298 K温度下放氢速率达到1304.67 m L·min^(-1)·g^(-1),活化能为29.1 k J·mol^(-1),并且具备一定的催化稳定性,表明Ni/C可作为一种廉价高效的催化剂应用于催化氨硼烷水解制氢。
Honeycomb-like hierarchical porous carbon was prepared and employed as substrate to support nickel nanparticles via an impregnation-chemical reduction method.The synthesized carbon-supported nickel(denoted as Ni/C)was used as catalysts for hydrogen generation from hydrolysis of ammonia borane(AB).Results of XRD,BET,SEM,Raman,and TEM measurements showed that the synthesized carbon possessed high specific surface area of 737 m^2·g^-1 and partially graphited structure;the supported amorphous Ni nanoparticles had an average particle size of 10 nm and were uniformly dispersed on the porous carbon substrate.The synthesized Ni/C exhibited high catalytic activity towards the hydrolysis of AB.At hydrolysis temperature of 298 K,Ni/C with 30wt%Ni loading was the most active,resulting in a high hydrogen release rate of 1304.67 mL·min^-1·g^-1and a low activation energy of 29.1 kJ·mol^-1.In addition,the Ni/C catalyst could be repeatedly utilized with respectable activity reservation for several times.The results indicate that Ni/C is a promising low-cost catalyst for hydrolytic dehydrogenation of AB.
作者
徐凤勤
胡小飞
程方益
梁静
陶占良
陈军
XU Feng-Qin;HU Xiao-Fei;CHENG Fang-Yi;LIANG Jing;TAO Zhan-Liang;CHEN Jun(Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education),Collaborative Innovation Center of Chemical Science and Engineering,College of Chemistry,Nankai University,Tianjin 300071,China)
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2015年第1期103-108,共6页
Chinese Journal of Inorganic Chemistry
基金
863项目(No.2012AA051503)
国家自然科学基金(No.51101089,51371100,51271094)
973项目(No.2011CB631301)
中央高校基本科研业务费专项资金资助项目
关键词
分级多孔碳
碳载镍
氨硼烷
水解
制氢
hierarchical porous carbon
carbon-supported Ni
ammonia borane
hydrolysis
hydrogen generation
