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Digitale Medien

Isomerization of alkenes during drying over zeolites (1994)

Lynch, David T. ; Wanke, Sieghard E.

Springer

Reaction kinetics and catalysis letters 52 (1994), S. 241-247

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ISSN: 1588-2837

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Abstract We observed that zeolite 5A, a zeolite commonly used for drying, isomerized 1-butene and 1-hexene at room temperature. The activity for 1-butene isomerization on 3A, 4A, 5A and 13X zeolites at temperatures of 300 to 565 K is reported.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02067794

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Digitale Medien

CO oxidation on Pt: Variable phasing of inputs during forced composition cycling (1990)

Graham, William R. C. ; Lynch, David T.

Hoboken, NJ : Wiley-Blackwell

AIChE Journal 36 (1990), S. 1796-1806

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ISSN: 0001-1541

Schlagwort(e): Chemistry ; Chemical Engineering

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Notizen: A combined experimental and theoretical investigation of the effect of forced feed composition cycling for CO oxidation on platinum has been performed. A novel approach to forced composition cycling was examined, in which the phase angle between the two input streams was varied. Reaction rate enhancement is shown to occur, and by varying the phasing of the feed streams it is possible to achieve a global maximum in the time-average reaction rate. This phenomenon can be explained quantitatively by a model based on an adsorbate-induced phase change of the Pt surface combined with CO adsorption self-exclusion. This mathematical model can also quantitatively describe the complex steady-state behavior (uniqueness-multiplicity transitions) observed for this reaction. The predictions of the model have been validated further through a detailed experimental study of the effects of feed flow rate, temperature, size of catalyst charge, and cycling frequency on the instantaneous and time-average conversions during forced cycling of the feed composition.

Zusätzliches Material: 8 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/aic.690361203

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Digitale Medien

Monte Carlo simulation of supported metal catalyst sintering and redispersion (1988)

Glen Campbell, W. ; Lynch, David T. ; Wanke, Sieghard E.

Hoboken, NJ : Wiley-Blackwell

AIChE Journal 34 (1988), S. 1528-1538

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ISSN: 0001-1541

Schlagwort(e): Chemistry ; Chemical Engineering

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Notizen: Monte Carlo simulations of sintering and redispersion of supported metal catalysts, based on an atomic migration mechanism, are presented. The support surface was modeled as a square grid with metal atoms located at various grid points. Interaction energies between metal atoms, and between metal atoms and support sites were specified. The probability of movement of each metal atom during one time increment (iteration) was calculated from the interaction energies. The effects of interaction energies, metal loading and initial distribution of the metal were examined. The model predictions are in good qualitative agreement with experimental observations. The model predicts “apparent” movement, splitting and coalescence of entire metal particles; these experimentally observed phenomena have usually been cited as evidence that sintering occurs by a particle migration mechanism.

Zusätzliches Material: 15 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/aic.690340915

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Digitale Medien

Simulation of sintering of model supported metal catalysts (1989)

Wanke, Sieghard E. ; Lynch, David T.

Weinheim : Wiley-Blackwell

Chemical Engineering & Technology - CET 12 (1989), S. 103-109

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ISSN: 0930-7516

Schlagwort(e): Chemistry ; Industrial Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Notizen: During the past decade, the sintering of model supported metal catalysts, i.e. catalysts consisting of metal deposited on very thin and flat oxide films, has been intensively investigated by transmission electron microscopy. In the current paper, a mathematical model, based on an atomic migration mechanism, for the sintering of these catalysts is presented. The predictions of the model, based on Monte Carlo simulations, are in very good agreement with the experimental observations, i.e. phenomena such as ‘apparent’ particle migration, splitting and neck formation between particles are predicated by the model.

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/ceat.270120115

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