摘要
采用常规液相沉淀反应合成了沸石咪唑酯金属有机骨架化合物ZIF-67,并对母液进行浓缩结晶以回收钴基化合物。通过高温焙烧的方式将ZIF-67及其母液转化为2种Co3O4(记作Co3O4-S和Co3O4-L)作为氨硼烷水解的催化剂前驱体。考察了反应液中氨硼烷浓度、催化剂浓度和反应温度对体系产氢速率的影响,并进行动力学分析。结果表明:Co3O4-S为多孔多面体结构而Co3O4-L为纳米颗粒;增加反应液中氨硼烷浓度和催化剂浓度有助于提升体系的产氢速率;经4次循环使用后,Co3O4-S催化产氢速率无衰减,Co3O4-L催化产氢速率为初始值的78%。
ZIF-67 as one kind of zeolitic imidazolate frameworks was synthesized by a conventional precipitation method,and the mother liquor was concentrated and crystallized to recover cobalt-based compounds.For AB hydrolysis,two kinds of Co3O4 catalyst precursors(i.e.,Co3O4-S and Co3O4-L)were prepared from the ZIF-67 and recovered compounds via calcination treatment,respectively.The morphology and phase composition of the samples were characterized by field-emission scanning electron microscopy and X-ray diffraction,respectively.Effects of AB and catalyst concentration and reaction temperature on the hydrogen generation rates and kinetics were investigated.The results show that Co3O4-S has a porous and polyhedral structure,and Co3O4-L is composed of nanoparticles.In addition,increasing AB and catalyst concentration can enhance the hydrogen generation rates.The maximum hydrogen production rates do not decline in the presence of Co3O4-S,but decrease to 78%of the initial level in the presence of Co3O4-L after recycling for four times.
作者
魏磊
刘洪燕
王东升
王茜
马丽文
WEI Lei;LIU Hongyan;WANG Dongsheng;WANG Qian;MA Liwen(College of Chemistry and Materials Science,Langfang Normal University,Langfang 065000,Hebei,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2020年第3期455-462,共8页
Journal of The Chinese Ceramic Society
基金
河北省自然科学基金(B2017408042).
关键词
金属有机骨架
四氧化三钴
氨硼烷
催化水解
制氢
metal-organic frameworks
cobalto-cobaltic oxide
ammonia borane
catalytic hydrolysis
hydrogen production
作者简介
第一作者:魏磊(1986—),男,博士,副教授,E-mail:weilei@lfnu.edu.cn。
