Abstract
The Task Group on Particle Size of ASTM Committee D-32 on Catalysts has compiled round-robin data on a single lot of typical equilibrium fluidizable cracking catalyst microspheres. These data were obtained by different methods employing laser light scattering, electroconductive sensing, and a micromesh sieving technique. Size distribution curves were constructed by plotting particle size vs. cumulative percent finer than the indicated size. In the range 35-100 ..mu..m and from about 5 to 95 cumulative %, the electroconductive sensing method data lie about 5-6 ..mu..m below those for the sieving method. The laser light scattering data curve lies between the other two curves in the range 35-60 ..mu..m and then falls at a progressively greater distance above the other two curves with increasing measured particle size. At 95 cumulative %, the laser light scattering curve is about 30 ..mu..m above the other two. This technique appears to significantly overstate the size of particles above about 80 ..mu..m.
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