Heattransfer and reaction modeling in monolithic catalysts
Abstract
Monolithic catalyst supports were subjected to a step change in inlet gas temperature, and the resulting transient thermal responses were measured. A simple onedimensional model with a constant Nusselt number is adequate to fit the data. The experimental Nusselt numbers fall between the theoretical values for constant wall temperature and for constant wall flux. Reactor models were developed which include the effects of heat and mass transfer, and the reaction kinetics of carbon monoxide oxidation over platinum. The steadystate models show a lightoff phenomenon in the channel where there is a jump in temperature and reaction rate. Reactants with Lewis numbers greater than one, such as hydrogen, can lead to a solid temperature that is much higher than the adiabatic temperature rise. Based on the criterion of maximum conversion, the order of perference for monolith channel shapes is squares, triangles, and sinusoids.
 Publication:

Ph.D. Thesis
 Pub Date:
 December 1975
 Bibcode:
 1975PhDT........59H
 Keywords:

 Catalysts;
 Heat Transfer;
 Reaction Kinetics;
 Mass Transfer;
 Mathematical Models;
 Nusselt Number;
 Steady State;
 Wall Temperature;
 Fluid Mechanics and Heat Transfer