Preparation of Nickel Nanoparticle-Deposited Silica Microsphere Catalysts

Abstract

We prepared Ni nanoparticle-deposited silica (SiO 2 ) microspheres using a method based on the collision of Ni nanoparticles, which were generated by hydrogen reduction of NiCl 2 , with SiO 2 microspheres. SiO 2 microspheres were heated in a gas-phase reactor to a temperature su ciently high to soften their surfaces. Notably, when SiO 2 microspheres were heated to temperatures higher than 973 K before collision with Ni nanoparticles, the nanoparticles showed no signs of sintering on the SiO 2 microsphere surfaces during heat treatment at a high temperature of 1,073 K. In addition, we independently controlled the diameter and content of Ni nanoparticles on the SiO 2 microspheres by changing NiCl 2 evaporation temperature and NiCl 2 -carrier gas ow rate.

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“…Recently SiO 2 microsphere supported NiNPs, which did not sinter during heat treatment at 1073 K for 3 h, were successfully produced. 25 Obtained NiNPs were deposited on the surface of SiO 2 microspheres through collision into the NPs with the microspheres previously heated in a gasphase reactor. It was found experimentally that SiO 2 microspheres had to be heated above 1046 K before the collision to suppress NiNPs sintering, and their content and size could be regulated by varying the evaporation temperature of NiCl 2 and the flow rate of N 2 gas carrying NiCl 2 vapor.…”