Publication

Control of effective rate of heterogeneous catalytic reactions by forced variation of concentration

Albert Renken
1974
Journal Articles

Abstract

Addnl. data considered in abstracting and indexing are available from a source cited in the original document. The effect of varying the feed concn. as a periodic rectangular function was studied in the hydrogenation of C2H4 in a fixed bed of an Al2O3-Pt catalysts. The C2H4 conversion clearly depends on the frequency and passes through a max. of ?60% above that of steady operation. The absorbing equil. const. was not affected by the unsteady operation, but the effective rate constant was .apprx.50% higher, because of higher catalysts activity. The strong dependence of the conversion on the frequency is explained by the reaction kinetics and quant. fixed by the calcn. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/af739fd8-df83-43ab-99b8-7ed8c0b77db0

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Albert Renken
1974
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/af739fd8-df83-43ab-99b8-7ed8c0b77db0

About this result

Related concepts (32)

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.

Hydrogenation

Hydrogenation is a chemical reaction between molecular hydrogen (H2) and another compound or element, usually in the presence of a catalyst such as nickel, palladium or platinum. The process is commonly employed to reduce or saturate organic compounds. Hydrogenation typically constitutes the addition of pairs of hydrogen atoms to a molecule, often an alkene. Catalysts are required for the reaction to be usable; non-catalytic hydrogenation takes place only at very high temperatures.

Reaction rate

The reaction rate or rate of reaction is the speed at which a chemical reaction takes place, defined as proportional to the increase in the concentration of a product per unit time and to the decrease in the concentration of a reactant per unit time. Reaction rates can vary dramatically. For example, the oxidative rusting of iron under Earth's atmosphere is a slow reaction that can take many years, but the combustion of cellulose in a fire is a reaction that takes place in fractions of a second.

Related publications (30)

Control of effective rate of heterogeneous catalytic reactions by forced variation of concentration

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