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The effect of cyclic operation on heterogeneous catalytic reaction with educt inhibition

Albert Renken
1984
Book Chapters

Abstract

In heterogeneous catalytic reactions, the rate of adsorption often falls extremely rapidly with increasing coverage. The reason can be a strong inhibition by a reactant or an increasing activation energy with coverage. Adsorption/desorption models based on those assumptions predict a considerable rate improvement for cyclic operation. This was demonstrated by exptl. study of the heterogeneous catalytic addn. of HOAc to C2H4. [on SciFinder (R)]

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Albert Renken
1984
Book Chapters

Abstract

Official source

Related concepts (22)

Heterogeneous catalysis

Heterogeneous catalysis is catalysis where the phase of catalysts differs from that of the reactants or products. The process contrasts with homogeneous catalysis where the reactants, products and catalyst exist in the same phase. Phase distinguishes between not only solid, liquid, and gas components, but also immiscible mixtures (e.g. oil and water), or anywhere an interface is present. Heterogeneous catalysis typically involves solid phase catalysts and gas phase reactants.

Adsorption

Adsorption is the adhesion of atoms, ions or molecules from a gas, liquid or dissolved solid to a surface. This process creates a film of the adsorbate on the surface of the adsorbent. This process differs from absorption, in which a fluid (the absorbate) is dissolved by or permeates a liquid or solid (the absorbent). Adsorption is a surface phenomenon and the adsorbate does not penetrate through the surface and into the bulk of the adsorbent, while absorption involves transfer of the absorbate into the volume of the material, although adsorption does often precede absorption.

Langmuir adsorption model

The Langmuir adsorption model explains adsorption by assuming an adsorbate behaves as an ideal gas at isothermal conditions. According to the model, adsorption and desorption are reversible processes. This model even explains the effect of pressure i.e. at these conditions the adsorbate's partial pressure, , is related to the volume of it, V, adsorbed onto a solid adsorbent. The adsorbent, as indicated in the figure, is assumed to be an ideal solid surface composed of a series of distinct sites capable of binding the adsorbate.

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The effect of cyclic operation on heterogeneous catalytic reaction with educt inhibition

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