Publication

Transient behavior of catalytic reactions with stop-effect

Albert Renken
1990
Journal Articles

Abstract

The transient behavior of a heterogeneous catalytic process described by a 2-site adsorption-desorption model was studied. After a stop on the supply of reactant, a temporary increase in the prodn. rate is predicted. Anal. solns. to describe the instantaneous reaction rate in a differential reactor are presented. The theor. results explain published exptl. observations that the reaction rate under transient conditions can be several times higher than under steady-state conditions. By model simulations it was found that the transient rate can be considerably higher than under optimum steady-state conditions. The relations developed are useful in model discrimination and parameter estn. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/50d810f0-14b1-43a0-a995-8c0b27150ddc

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Albert Renken
1990
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/50d810f0-14b1-43a0-a995-8c0b27150ddc

About this result

Related concepts (32)

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.

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.

Transient state

A system is said to be transient or in a transient state when a process variable or variables have been changed and the system has not yet reached a steady state. The time taken for the circuit to change from one steady state to another steady state is called the transient time. When a chemical reactor is being brought into operation, the concentrations, temperatures, species compositions, and reaction rates are changing with time until operation reaches its nominal process variables.

Related publications (31)

Transient behavior of catalytic reactions with stop-effect

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