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A New Theoretical Approach to Catalytic Converters

1991; Elsevier BV; Linguagem: Inglês

10.1016/s0167-2991(08)62996-1

2542-6613

Jean Leclerc, D. Schweich, Jacques Villermaux,

Catalysts for Methane Reforming

Abstract A theoretical analysis to catalytic converter based on the heterogeneous cell model which accounts for flow distribution, gas-solid heat and mass transfer, chemical reactions and heat losses was developed. The converter efficiency is very sensitive to heat and mass transfer coefficients, especially to their variation with temperature. The effect of operating conditions, i.e;, feed temperature and composition or converter design controlling the velocity profile in the channels was also studied. Operating conditions determine the temperature profile and the catalyst utilization through out the monolith and consequently may change the conversion of pollutants and the thermal damage of the catalyst. The control of the velocity distribution may suppress the incompatibility between high conversion in permanent regime and light-off performance. Model results were used to suggest design improvements of catalytic converters, for example high upsteam activity of catalyst improves the light-off.