Cu掺杂的NiO的制备及其超级电容器性能

采用低热固相反应法合成掺杂Cu的Ni(OH)2,将其在300℃下热处理得到相应的NiO.电化学测试表明∶掺杂量为n(Ni)∶n(Cu)=100∶0.25时,NiO电极的比容量最高,为99-120 F/g,具有良好的充放电性能,而不掺杂的只有83-111 F/g,因此掺杂Cu有利于提高NiO的电化学性能.

焙烧对NiO-MoO_3-K_2CO_3/Al_2O_3水煤气变换催化剂的影响

CoO-MoO_3,NiO-MoO_3,CoO-WO_3,NiO-WO_3/Al_2O_3等催化剂在工业上广泛应用于加氢和脱硫过程,对于这类催化剂的研究大多针对此反应.当这类催化剂添加碱金属盐后对水煤气变换反应有明显的促进作用,而对加氢脱硫则显示出负效果.对于水煤气变换反应,这类催化剂最大的特点是能耐高浓度的硫,并具有低温活性.本工作对不同温度处理的NiO-MoO_3-K_2CO_3/Al_2O_3催化剂进行了XRD,XPS,DRS的研究,试图了解焙烧温度对催化剂结构,活性组分存在状态和分布以及催化活性的影响.

Synergetic effect between NiO and Ni3V2O8 in propane oxidative dehydrogenation

The oxidative dehydrogenation (ODH) of propane was investigated on Ni-V-O catalysts in a wide range of vanadium contents (5-40%). The addition of a small amount of vanadium significantly increased the catalytic activity of NiO for oxidative dehydrogenation of propane to propene. The formation of propene has a good correlation with the coexistence of NiO and Ni3V2O8. This result strongly suggests that a synergetic effect exists between them in NiXV1-XOY (X = 0.95 to 0.6). The best results were obtained with a high Ni/V ratio (e.g. X = 0.95 to 0.85). The active sites and selective oxygen species are discussed. The influence of the catalyst preparation technique and the redox properties of the catalyst were also examined.