TY - JOUR
T1 - Nonuniform activity distribution in catalyst particles
T2 - Benzene hydrogenation on supported nickel in a single pellet diffusion reactor
AU - Au, Shirley S.
AU - Dranoff, Joshua S.
AU - Butt, John B.
N1 - Funding Information:
Acknowledgement--This research was supported by Amoco Oil Company and by the Murphy fund of North-western University. We are indebted to Drs M. Barr and M. Pacheco for fruitful discussion throughout the course of the work.
Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.
PY - 1995/12
Y1 - 1995/12
N2 - A single pellet diffusion reactor (SPDR) of new design has been used to investigate the influence of nonuniform distributions of active ingredient on the Ni-catalyzed hydrogenation of benzene. Five different distributions, ranging from preferential shell-loading to uniform to preferential core loading, have been studied under isothermal conditions. Analysis of results has been carried out using a simple one-dimensional diffusion/reaction analysis, which the configuration of the SPDR is set to mimic. The rate of the reaction follows an Eley-Rideal model, effectively positive fractional-order under the experimental conditions, for which kinetics the nonuniform distribution problem has not been studied experimentally before. Preferential shell-loading yields the highest catalytic effectiveness but because of the complex interactions between the reaction kinetics and the activity profiles within the pellets, there is no simple relationship between diffusion lengths and effectiveness even for large values of the Thiele modulus.
AB - A single pellet diffusion reactor (SPDR) of new design has been used to investigate the influence of nonuniform distributions of active ingredient on the Ni-catalyzed hydrogenation of benzene. Five different distributions, ranging from preferential shell-loading to uniform to preferential core loading, have been studied under isothermal conditions. Analysis of results has been carried out using a simple one-dimensional diffusion/reaction analysis, which the configuration of the SPDR is set to mimic. The rate of the reaction follows an Eley-Rideal model, effectively positive fractional-order under the experimental conditions, for which kinetics the nonuniform distribution problem has not been studied experimentally before. Preferential shell-loading yields the highest catalytic effectiveness but because of the complex interactions between the reaction kinetics and the activity profiles within the pellets, there is no simple relationship between diffusion lengths and effectiveness even for large values of the Thiele modulus.
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U2 - 10.1016/0009-2509(95)00211-M
DO - 10.1016/0009-2509(95)00211-M
M3 - Article
AN - SCOPUS:0029534314
SN - 0009-2509
VL - 50
SP - 3801
EP - 3812
JO - Chemical Engineering Science
JF - Chemical Engineering Science
IS - 23
ER -