Zeitlineare Temperaturführung — der Weg zu einer neuen Reaktionskinetik

Koch, E.

doi:10.1002/ange.19830950304

Angewandte Chemie

1983

DOI: 10.1002/ange.19830950304

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Zeitlineare Temperaturführung — der Weg zu einer neuen Reaktionskinetik

E. Koch

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1995

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Cited by 24 publications

References 101 publications

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Grundlagen der Thermischen Analysetechniken und ihre Anwendungen in der präparativen Chemie

Cammenga

Epple

1995

Angewandte Chemie

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Die Untersuchung der thermodynamischen Eigenschaften und der Reaktivität neu synthetisierter Substanzen ergibt interessante Einblicke in deren Chemie. Mit der Thermischen Analyse erhält man bei kleinen Probenmengen (oft nur wenigen Milligramm) umfangreiche Informationen. Daneben können die aus der Thermischen Analyse gewonnenen Daten für die Syntheseplanung und ‐optimierung verwendet werden. Zu nennen sind hier vor allem die Identifizierung von Substanzen und die Bestimmung ihrer Reinheit sowie die Bestimmung der charakteristischen Temperaturen und der Enthalpien von Phasenübergängen (Schmelzen, Verdampfen), Phasenumwandlungen und Reaktionen. Untersuchungen zur Kinetik von Folge‐ und Zersetzungsreaktionen sind ebenfalls gut möglich. Mit den heute erhältlichen Meßgeräten können derartige Untersuchungen meist schnell und mit wenig Aufwand durchgeführt werden. In diesem Beitrag sollen die Grundlagen der Thermischen Analysemethoden und an ausgewählten, nicht Vollständigkeit anstrebenden Beispielen ihre Anwendungen auf nieder‐ und hochmolekulare Stoffe vorgestellt werden.

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Grundlagen der Thermischen Analysetechniken und ihre Anwendungen in der präparativen Chemie

Cammenga

Epple

1995

Angewandte Chemie

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Basic Principles of Thermoanalytical Techniques and Their Applications in Preparative Chemistry

Cammenga¹,

Epple²

1995

Angew. Chem. Int. Ed. Engl.

102

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The investigation of thermodynamic properties and reactivity yields interesting insights into the chemistry of newly synthesized substances. With thermal analysis extensive information can be gained from small samples (often only a few milligrams). In addition, the data obtained by thermal analysis can be used to plan and optimize a synthesis. Among the most important applications are identification and purity analysis, and the determination of characteristic temperatures and enthalpies of phase transitions (melting, vaporization), phase transformations, and reactions. Investigations into the kinetics of consecutive reactions and decomposition reactions are also possible. With the instruments available today such analyses can usually be performed quickly and easily. In this review the fundamentals of thermoanalytical methods are described and illustrated with selected examples of applications to low and high molecular weight compounds.

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New strategies for studies on the kinetics and energetics of the Belousov‐Zhabotinskii reaction

Koch

Nagy-Ungvárai

1987

Ber Bunsenges Phys Chem

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Catalysis / Chemical Kinetics / Computer Experiments / Oscillatory Chemical Reactions / Thermal AnalysisThe oscillatory Belousov-Zhabotinskii reaction and its subsystems were studied by z 1700 DTA and UV experiments performed at linearly increased temperature. The starting concentrations of bromate, bromide, catalyst, and malonic acid were varied in order to obtain "concentration codes" of such series. These represent the dependence of any parameters in discrete ranges of the starting concentrations of the different components. Particularly adequate for a model check are the mechanistic codes (= MCC's), which concern the shape index and reaction type index: If these mechanistic coordinates remain constant in such a concentration interval, other data, e.g. activation energies, can be attributed to a rate-determining process. -The results led to a nine-step model which is based on the FKN mechanism and is capable of roughly reproducing the influence of the initial concentrations and heating rate on 11 parameters characteristic of the envelope and of the oscillations of the experimental signals. The MCC's of the experimental and theoretical series are similar, revealing 4-5 rate-determining steps in the different concentration ranges. -The activation energies agree with values from the literature, cited for three steps; these and further resulting activation energies are consistent with our studies with subsystems.

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Zeitlineare Temperaturführung — der Weg zu einer neuen Reaktionskinetik

Cited by 24 publications

References 101 publications

Grundlagen der Thermischen Analysetechniken und ihre Anwendungen in der präparativen Chemie

Grundlagen der Thermischen Analysetechniken und ihre Anwendungen in der präparativen Chemie

Basic Principles of Thermoanalytical Techniques and Their Applications in Preparative Chemistry

New strategies for studies on the kinetics and energetics of the Belousov‐Zhabotinskii reaction

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