Abstract
In this paper, it is shown that the rate of hydrogen absorption into an aqueous solution is considerably enhanced by the presence of small particles, provided that (a) particle-to-bubble adhesion occurs, so that, during the absorption, a sufficiently large part of the gas—liquid interface is covered by adhering particles; (b) at equilibrium, the hydrogen concentration in the particles is much higher than that in the surrounding liquid. A model is derived to calculate the relationship between the enhancement factor E 0 of the initial gas-absorption rate, the fraction ζ of the gas-liquid interface covered by adhering particles, and the concentration γ s of the catalyst particles in the slurry. The model is verified by flotation experiments and gas-absorption measurements, performed with hydrogen and aqueous suspensions containing different concentrations of small carbon-supported or alumina-supported catalyst particles.
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