Abstract

The preparation, characterization and catalytic test of alloy type poly(N-vinyl-2-pyrrolidone)-protected nickel-ruthenium nanoparticles (3.8 ± 1.6 nm) (Ni-Ru@PVP) to liberate hydrogen from ammonia borane via hydrolysis have been reported in the present study. Ni-Ru@PVP nanoparticles have easily been synthesized by simultaneous reduction of suitable water-soluble nickel and ruthenium salts in the mixture of water/ethanol by a modified method of alcohol reduction with PVP as both reducing agent and stabilizer. They have been characterized by ultraviolet-visible spectroscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. They have been detected to be highly efficient and durable catalysts to liberate hydrogen from ammonia borane via hydrolysis under ambient conditions. Among prepared catalysts, Ni_0.5Ru_0.5@PVP nanoparticles provided mean turnover frequency (TOF) of 300 min⁻¹ and activation energy of 46.8 ± 1.2 kJ mol⁻¹ in this hydrolysis reaction.

摘要

合金型poly( N)的制备、表征及催化试验-vinyl-2-pyrrolidone)-保护的镍-钌纳米颗粒 (3.8 ± 1.6 nm) (Ni-Ru@PVP) 通过水解从氨硼烷中释放氢。Ni-Ru@PVP 纳米粒子很容易通过在水/乙醇混合物中同时还原合适的水溶性镍盐和钌盐，通过改进的醇还原方法合成，PVP 作为还原剂和稳定剂。它们已通过紫外-可见光谱、透射电子显微镜和 X 射线光电子能谱进行表征。已检测到它们是高效且耐用的催化剂，可在环境条件下通过水解从氨硼烷中释放氢气。在制备的催化剂中，Ni _0.5 Ru _0.5@PVP 纳米粒子在此水解反应中提供 300 min ^{-1 的}平均周转频率 (TOF)和 46.8 ± 1.2 kJ mol ^{-1 的}活化能。