Particle‐size distribution of NiO in coprecipitated NiO‐Al2O3 powders

摘要

The particle‐size distributions along the [100] and [111] directions of NiO catalyst particles which were coprecipitated with alumina were measured by x‐ray diffraction profile analysis. The average particle size is about 20 Å in both directions. The distribution along the [111] direction shows three peaks indicating an anisotropy in the shape of the particles and supports the idea that the particles are platelets with the [111] direction normal to their surface. This study shows beyond doubt that careful x‐ray diffraction profiles analysis techniques employing least‐squares analysis methods can be used to determine the distribution of particle sizes existing in metal supported catalyst materials.