Abstract
The problem of heat and mass transfer of a porous catalyst particle is considered. On the her surface, including the inner surface of the pores, an irreversibly heterogeneous first-order reaction proceeds. It has been analytically shown that in a heated gas mixture, the catalyst's porosity reduces the minimum impurity's concentration of catalytic spontaneous combustion in the mixture and increases the catalyst particle's corresponding diameter. This concentration corresponds to the external kinetic and internal diffusion reaction's modes.
Highlights
Multiple heterogenous chemical oxidation reactions and flameless combustion of combustible gases admixtures occur on porous catalyst particles staying within gas/air mixture flow
Critical conditions of flameless combustion depend on size of the particle specific surface area and on combustible gases concentration
Combustible gas surface relative mass concentration may be calculated subject to steady rate of chemical reaction and mass transfer rate to the particle’s surface: ( ) ( ) æ kSrgsYas brg ç çè
Summary
Multiple heterogenous chemical oxidation reactions and flameless combustion of combustible gases admixtures occur on porous catalyst particles staying within gas/air mixture flow. Critical conditions of flameless combustion depend on size of the particle specific surface area and on combustible gases concentration. The majority of active areas are located inside pores in oxidation catalyst [1]. Catalytic reaction occurs after the reagent molecules penetrate through the boundary level surrounding catalyst’s particles (external diffusion) and afterwards through the particle’s pores (internal diffusion). Ingredients transfer inside the catalyst should be taken into account if the pores’ diameter exceeds 50 nm. Such solid catalyst particles with large pores are applied, for instance, in oxidation reactions, membrane reactors and in certain biological applications
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