Effectiveness of large catalyst pellets—An experimental study
1966; Elsevier BV; Volume: 5; Issue: 2 Linguagem: Inglês
10.1016/s0021-9517(66)80016-7
ISSN1090-2694
Autores Tópico(s)Catalysis and Oxidation Reactions
ResumoThe effectiveness of the interior surface of porous catalyst pellets was studied by measuring rates of reaction for the oxidation of carbon monoxide. The data were obtained with 10% NiO-on-alumina catalyst for particles of catalyst and for 3/4-inch spherical pellets made from the particles. Pellet rates of reaction per unit mass decreased with increasing pellet density as a consequence of the increased diffusion resistance. Rates per pellet showed a flat maximum as the density increased, as a result of the counter effects of increasing diffusion resistance and increasing surface area per pellet. Attempts to predict the pellet rates of reaction from the particle rate data failed. Errors in diffusivities and the presence of a skin diffusion effect do not appear to explain the discrepancy between predicted and observed effectiveness factors. The blocking of micropores during the pelletting process is suggested as a contributing factor.
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