采用硼酸为缓冲剂,柠檬酸钠为络合剂在碱性介质中化学沉积Ni Fe P合金.考察了工艺条件如pH、FeSO4·7H2O浓度和温度对沉积速度的影响.获得了沉积速度快,镀液稳定性好的工艺条件.采用差示扫描量热和X射线衍射研究了Ni Fe P合金的晶...采用硼酸为缓冲剂,柠檬酸钠为络合剂在碱性介质中化学沉积Ni Fe P合金.考察了工艺条件如pH、FeSO4·7H2O浓度和温度对沉积速度的影响.获得了沉积速度快,镀液稳定性好的工艺条件.采用差示扫描量热和X射线衍射研究了Ni Fe P合金的晶化行为.结果表明,镀层在镀态呈非晶结构,镀层在200.5℃晶化为亚稳的Ni Fe合金,310℃晶化为立方FeNi3合金,369.2℃晶化为四方的Ni3P,而491.3℃为继续生成FeNi3的吸热峰.展开更多
Oxygen storage and adsorptive properties of praseodymium oxides were investigated by pulse experiments and temperature - programmed desportion/reduction (TPD/TPR) experiments. Pr2O3 possesses the similar oxygen storag...Oxygen storage and adsorptive properties of praseodymium oxides were investigated by pulse experiments and temperature - programmed desportion/reduction (TPD/TPR) experiments. Pr2O3 possesses the similar oxygen storage properties to CeO2, and its dynamic oxygen storage capacity is 14.9 mumol.g(-1). The studies on TPD Of O-2, H2O and CO and TPR show that Pr2O3 provides more active surface oxygen species and at a lower temperature than CeO2. It is suggested that Pr2O3 can be a well candidate as an oxygen storage component in automobile three-way catalyst.展开更多
文摘采用硼酸为缓冲剂,柠檬酸钠为络合剂在碱性介质中化学沉积Ni Fe P合金.考察了工艺条件如pH、FeSO4·7H2O浓度和温度对沉积速度的影响.获得了沉积速度快,镀液稳定性好的工艺条件.采用差示扫描量热和X射线衍射研究了Ni Fe P合金的晶化行为.结果表明,镀层在镀态呈非晶结构,镀层在200.5℃晶化为亚稳的Ni Fe合金,310℃晶化为立方FeNi3合金,369.2℃晶化为四方的Ni3P,而491.3℃为继续生成FeNi3的吸热峰.
文摘Oxygen storage and adsorptive properties of praseodymium oxides were investigated by pulse experiments and temperature - programmed desportion/reduction (TPD/TPR) experiments. Pr2O3 possesses the similar oxygen storage properties to CeO2, and its dynamic oxygen storage capacity is 14.9 mumol.g(-1). The studies on TPD Of O-2, H2O and CO and TPR show that Pr2O3 provides more active surface oxygen species and at a lower temperature than CeO2. It is suggested that Pr2O3 can be a well candidate as an oxygen storage component in automobile three-way catalyst.
