Abstract
The effect of the size of Pd/C catalyst particles adhering to gas bubbles on the enhancement of the hydrogen absorption rate into a buffered aqueous hydroxylaminephosphate solution is studied using a 0.5-litre bubbles-containing batch-operated stirred slurry reactor. It is shown experimentally that at a given catalyst particles concentration in the liquid phase the enhancement of gas absorption increases considerably with decreasing catalyst particle size due to increased adhesion of smaller catalyst particles to the hydrogen bubbles. A film model has been applied to describe the experimental results. This model shows that the enhancement of the gas absorption rate is caused by the phenomenon that for small Pd/C catalyst particles the film catalyst concentration is much larger than the bulk catalyst concentration.
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