State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, People's Republic of China.
State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, People's Republic of China.
J Colloid Interface Sci. 2017 Apr 1;491:123-132. doi: 10.1016/j.jcis.2016.12.043. Epub 2016 Dec 19.
Silica protected CuNi bimetallic nanoparticles (CuNi@SiO) were successfully prepared by a modified co-reduction method. Typically, ammoniacal Cu(II) and Ni(II) were firstly dispersed and encapsulated inside silica by the method of reverse microemulsion. Then, ultra small CuO and NiO particles were in-situ formed during calcination under air. CuNi bimetallic nanoparticles were obtained by the co-reduction of CuO and NiO under H at high temperature. The composition and size of CuNi bimetallic nanoparticles was tuned simply by varying the concentration of precursor solutions. The samples were characterized by FT-IR, TEM, XPS, XRD and ICP-OES. The reduction of p-nitrophenol by NaBH was chosen as model reaction to evaluate the catalytic activity. The results indicate that CuNi bimetallic nanoparticles prepared by our method show size and composition dependent catalytic activity. The activation energy of CuNi@SiO for the same reaction was calculated as to be 16.6kJ/mol which was much lower than that of Cu@SiO (29.0kJ/mol) and Ni@SiO (39.5kJ/mol).
采用改进的共还原法成功制备了硅保护的铜镍双金属纳米粒子（CuNi@SiO）。通常，氨合的 Cu（II）和 Ni（II）首先通过反胶束法分散并包裹在二氧化硅内部。然后，在空气中煅烧时，超小的 CuO 和 NiO 颗粒原位形成。在高温下 H 气氛下，通过 CuO 和 NiO 的共还原获得 CuNi 双金属纳米粒子。通过改变前驱体溶液的浓度，可以简单地调整 CuNi 双金属纳米粒子的组成和尺寸。通过 FT-IR、TEM、XPS、XRD 和 ICP-OES 对样品进行了表征。选择 NaBH 还原对硝基苯酚作为模型反应来评估催化活性。结果表明，通过我们的方法制备的 CuNi 双金属纳米粒子表现出尺寸和组成依赖性的催化活性。对于相同的反应，CuNi@SiO 的活化能计算为 16.6kJ/mol，明显低于 Cu@SiO（29.0kJ/mol）和 Ni@SiO（39.5kJ/mol）。
