Solid-phase Synthesis Of Nanosized Nickel Powder And Its Catalytic Performance

1. Preparation and characterization of catalystsNickel (NiO) powders with the sizes in the range of 20–25 nm were prepared via the reduction of nanosized NiO powders (The nanosized NiO powders were derived from low temperature (350℃) calcinations in air of nanosized Ni(OH) powders, which were firstly prepared through the room temperature solid state reaction between NiSO₄·6H₂O and NaOH) by H₂ at 400℃for 4 h and a series of palladium and platinum catalysts supported on NiO were prepared. The samples were characterized using XRD,TEM,SEM,IR,XPS and BET methods. The catalytic activity of the obtained nanosized Ni powders for hydrogenation of nitrobenzene, cinnamic aldehyde and maleic anhydride was investigated. The catalysts we made had high stability in the air and maintained the configuration of catalysts during the reaction process.The experimental results shown that the catalysts we made had high stability in the air and maintained the configuration of catalysts during the reaction process. Supporting palladium and platinum hadn't changed the configuration of the sample. It suggested that the obtained nanosized Ni powders behaved better catalytic activity for hydrogenation of nitrobenzene to aniline than Raney-Ni. The experimental results shown that the catalyst improved by metal Pd had higher activity than the catalyst improved by metal Pt in hydrogenation of cinnamic aldehyde and the nanosized Ni powders shown high catalytic activity for hydrogenation of maleic anhydride.2. The studies of the catalytic activity for nitrobenzene hydrogenationThe catalytic activity of as-prepared Ni powders for hydrogenation of nitrobenzene to aniline was studied, and the factors such as temperature, catalyst amount and H2...