Preparation of Nickel Catalysts Supported on Silica Particles by Collisions at a High Speed in a Gas-Phase Reactor

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<p>Silica (SiO2) particle-supported nickel (Ni) nanoparticles were prepared using a gas-phase synthesis method in which Ni nanoparticles, generated by hydrogen reduction of NiCl2, collide with SiO2 particles with a diameter of approximately 0.1 µm. Before collisions, SiO2 particles were heated in a gas-phase reactor to a temperature sufficiently high to soften their surfaces. When collisions between Ni and SiO2 particles occurred at a high speed of 38.6 m/s, Ni nanoparticles smaller than 10 nm could be captured by SiO2 particles heated to 1,723 K, and showed no signs of sintering on the SiO2 particle surfaces during heat treatment at a high temperature of 1,073 K.</p>

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