Steady-state vs non-steady-state transient kinetic analysis of surface coverages during the oxidative coupling of methane
- Univ. of Pittsburgh, PA (United States)
Because of its greater simplicity and lower cost, non-steady-state transient kinetic analysis has been used by a number of workers in the study of methane oxidation. With the non-steady-state technique, the concentration level of one of the reactants is put through a step change and the resulting transients in product and reactant concentrations are obtained. The quantity of surface intermediates detected during this real transient may or may not relate to those existing under steady-state reaction since the surface is experiencing major changes. Examination of reactive surface intermediates under steady-state isotopic transient kinetic analysis. This technique entails an abrupt switch in the isotopic composition of one of the reactants, which does not disturb the steady-state condition, accompanied by the continuous monitoring (e.g., by mass spectrometry) of the relaxation and evolution of labeled reactants and products. The main difference between these two techniques is the unavoidable perturbation of the reaction environment with non-steady-state isotopic transient techniques. Results are presented that detail for the first time some of the problems with trying to relate amounts of surface species measured under non-steady-state conditions to concentrations of surface reaction intermediates existing during the steady-state oxidative coupling of methane.
- OSTI ID:
- 7106008
- Journal Information:
- Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 132:2; ISSN 0021-9517; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
033000* -- Natural Gas-- Properties & Composition
10 SYNTHETIC FUELS
100200 -- Synthetic Fuels-- Production-- (1990-)
ALKANES
CATALYTIC EFFECTS
CATALYTIC REFORMING
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
FLUID FLOW
HYDROCARBONS
KINETICS
MASS SPECTROSCOPY
METHANE
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
REACTION INTERMEDIATES
REACTION KINETICS
REFORMER PROCESSES
SAMARIUM COMPOUNDS
SAMARIUM OXIDES
SPECTROSCOPY
STEADY-STATE CONDITIONS
TRANSIENTS
UNSTEADY FLOW