Analysis of kinetic data for heterogeneous reactions

Weller, Sol W.

doi:10.1002/aic.690020112

Cited by 77 publications

(28 citation statements)

References 15 publications

(3 reference statements)

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“…Models 10,11,12, and 13 were proposed by Rogers (19611, Mezaki (19681, Kolboe (1972), and Shabaker (19651, respectively, with less information about the surface species. Models 14 and 15 are included to test a suggestion of Weller (1956) that catalytic reaction rates be modeled as power functions of the partial pressures. Each model includes a function…”

Section: Enample 2: Kinetics Of a Three-component Systemmentioning

confidence: 99%

Discrimination and goodness of fit of multiresponse mechanistic models

1998

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Section: Enample 2: Kinetics Of a Three-component Systemmentioning

confidence: 99%

Discrimination and goodness of fit of multiresponse mechanistic models

1998

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“…The data, in fact, scatter so much that reasonably good correlations could be made on a aero-order basis, that is a straight horizontal line to represent all of the values, a somewhat better correlation on the basis of a simple first, second-orderreversible reaction, and perhaps a better correlation by Equation (6) as proposed by the experimenter. While the data can be represented adequately by Equation (6), there is a real question as to whether so complex a correlption is justified. It seems obvious that the reliability of the previously quoted conclusion as to mechanism is extremely dubious.…”

Section: Illustrations Of the Correlation Problem Chemical Kineticsmentioning

confidence: 99%

Experimental foundations of chemical engineering

White

Churchill

1959

AIChE Journal

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Fundamental knowledge consists of understanding not only the models which correlate and rationalized observations but also the quantity and quality of the observations. The degree of correlation attempted should be consistent with this quantity and quality.The scientist correlates and rationalizes observations primarily to broaden his general understanding of the physical universe, and his efforts at correlation are more often than not a way of speculating on the future experiments which should be undertaken to test his concepts. For this purpose he is often satisfied with accuracy to one order of magnitude. The engineer, faced with the design and operation of expensive equipment, is almost always interested in a much higher accuracy in his correlations.Virtually all existing data in the rate processes are forced into rationalizations based upon either potential-diff erence or potential-gradient models. The application of these models to systems of even relatively simple geometry gives rise to mathematical complexity beyond present analytic ability. Even so, our ability to measure and observe seems to be far below our ability to analyze. These two models have been used effectively in chemical engineering in the past and have served to organize a great deal of information in the rate processes. Present research efforts appear to be directed primarily toward filling in gaps in available data and in refining the application of the models. We seem to suffer from a lack of models to test and a lack of data designed to test critically the existing models. There is relatively little exploratory research in chemical engineering as compared, for example, to physics.When one views chemical engineering as a chain extending from economics, markets, mechanical design, process design, and process development to process research, the uncertainties inherent in some of the links easily involve variances of 50 to 80%. Under these circumstances it would appear that the present orientation of research is distributed much too heavily toward refinement of existing ideas and not nearly enough toward exploration.The observations made by scientists and engineers form the basis of chemical engineering. These observations are collected in a concise form as correlations and rationalized in terms of models or mechanisms, which are referred to as hypotheses, theories, and laws.

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“…Fluorescence of Salicylates and Related Compounds-For salicylates and related compounds, emission in the 330-360-nm region of the spectrum has been postulated as arising from the neutral molecule (8,25). Emission in the 400-450-nm region of the spectrum originates from the dipolar ion formed within the lifetime of the S1 state uia either inter-or intramolecular proton transfer (8,(25)(26)(27)(28).…”

Section: Uv Absorption Of Salicylates and Relatedmentioning

confidence: 99%

“…Emission in the 400-450-nm region of the spectrum originates from the dipolar ion formed within the lifetime of the S1 state uia either inter-or intramolecular proton transfer (8,(25)(26)(27)(28).…”

Section: Uv Absorption Of Salicylates and Relatedmentioning

confidence: 99%