Low Temperature Decomposition of Nitrous Oxide over Fe/ZSM-5: Modelling of the Dynamic Behaviour

Albert Renken, Lioubov Kiwi
2005
Article

Résumé

The kinetics of N2O decomposition to gaseous nitrogen and oxygen over HZSM-5 catalysts with low content of iron (360 °C. The amount of surface NO during the transient increases with the reaction temperature, the reaction time, and the N2O concentration in the gas phase up to a maximum value. The maximum amount of surface NO was found to be independent on the temperature and N2O concentration in the gas phase. This leads to a first-order N2O decomposition during the transient period, and to a zero-order under steady state. A kinetic model is proposed for the autocatalytic reaction. The simulated concentration–time profiles were consistent with the experimental data under transient as well as under steady-state conditions giving a proof for the kinetic model suggested in this study.

Source officielle

https://infoscience.epfl.ch/record/84750?ln=fr

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Proximité ontologique

Chimie

Chimie physique: Cinétique chimique

Concepts associés (35)

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.

In chemistry, the rate law or rate equation for a chemical reaction is a mathematical equation that links the rate of forward reaction with the concentrations or pressures of the reactants and constant parameters (normally rate coefficients and partial reaction orders). For many reactions, the initial rate is given by a power law such as where [\mathrm{A}] and [\mathrm{B}] express the concentration of the species \mathrm{A} and \mathrm{B}, usually in moles per liter (molarity, M).

Une réaction chimique est une transformation de la matière au cours de laquelle les espèces chimiques qui constituent la matière sont modifiées. Les espèces qui sont consommées sont appelées réactifs ; les espèces formées au cours de la réaction sont appelées produits. Depuis les travaux de Lavoisier (1777), les scientifiques savent que la réaction chimique se fait sans variation mesurable de la masse : , qui traduit la conservation de la masse. thumb|La réaction aluminothermique est une oxydo-réduction spectaculaire.

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Low Temperature Decomposition of Nitrous Oxide over Fe/ZSM-5: Modelling of the Dynamic Behaviour

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