摘要
目的优化Co-Ni-Cr-P合金催化剂镀液配方,探究其催化碱性Na BH4溶液制备氢气的最佳条件。方法利用化学镀的方法,在三氧化二铝(γ-Al2O3)基体表面镀覆了Co-Ni-Cr-P合金。利用X射线衍射仪(XRD)、场发射扫描电子显微镜(FE-SEM)、X射线能量色散谱仪(EDS)、化学吸附仪(BET)和电感耦合等离子体发射光谱(ICP),对该催化剂的结构、微观形貌等进行了系统表征。结果 Co-Ni-Cr-P合金镀层均匀地分布在三氧化二铝载体表面,ICP测得该催化剂的相对组成为48.46%Co+19.77%Ni+21.02%Cr+10.75%P(质量分数)。化学镀Co-Ni-Cr-P的实验参数为:21.96 g/L硫酸钴,2.44 g/L硫酸镍,0.6g/L硝酸铬,20 g/L柠檬酸钠,10 g/L氟化铵,40 g/L次亚磷酸钠,p H=9,温度(90±1)℃。结论 20 m L含4%的硼氢化钠溶液在40℃时的产氢速率约为1500 m L/(g·min)。根据动力学计算可得,Co-Ni-Cr-P/γ-Al2O3合金催化剂催化碱性Na BH4溶液制备氢气的反应活化能为45.96 k J/mol。
The work aims to study optimum conditions of generating hydrogen by catalyzing alkaline NaBH4 solution by optimizing formula of Co-Ni-Cr-P alloy catalysts. The Co-Ni-Cr-P alloy was coated on the surface of aluminium sesquioxide（γ-Al2O3） in the method of electroless deposition. Structure and microstructure of the Co-Ni-Cr-P/γ-Al2O3 catalysts were characterized systematically with X-ray diffractometer（XRD）, field emission scanning electron microscope（FE-SEM）, X-ray energy dispersive spectrometer（EDS）, nitrogen adsorption-desorption isotherm（BET） and inductively coupled plasma atomic emission spectrometer（ICP）. Co-Ni-Cr-P alloy coating was well distributed onto the surface of carrier γ-Al2O3. According to ICP results, relative composition was 48.46 wt% Co, 19.77 wt% Ni, 21.02 wt% Cr and 10.75 wt% P（mass fraction, similarly hereinafter）. Experiment parameters of electrolessly plating Co-Ni-Cr-P were： 21.96 g/L cobalt sulfate heptahydrate, 2.44 g/L nickel sulfate hexahydrate, 0.6 g/L Chromic nitrate nonahydrate, 20 g/L sodium citrate dehydrate, 10 g/L ammonium fluoride, 40 g/L sodium hypophosphite Monohydrate, p H=9 and temperature（90±1） ℃. Average hydrogen generation rate of 20 m L 4% Na BH4 solution was 1500 m L/（g·min）. Reaction activation energy of the Co-Ni-Cr-P/γ-Al2O3 alloy catalysts in hydrogen generation was measured to be 45.96 k J/mol.
出处
《表面技术》
EI
CAS
CSCD
北大核心
2017年第12期179-185,共7页
Surface Technology
