Particlehyphen;size distribution of NiO in coprecipitated NiOhyphen;Al2O3powders

摘要

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