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  • 1
    Electronic Resource
    Electronic Resource
    Halogen interchange during complex formation between N-halosuccinimides and quaternary ammonium halides (1986)
    s.l. : American Chemical Society
    The @journal of organic chemistry 51 (1986), S. 4400-4403 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00373a011
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  • 2
    Electronic Resource
    Electronic Resource
    Activation energy of the catalytic oxidation of methylbenzenes over metal oxides (1989)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 93 (1989), S. 6136-6141 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100353a037
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  • 3
    Electronic Resource
    Electronic Resource
    On the catalytic C-H activation of some silicon dioxide overlayers on thin metal film systems — An observation on the isokinetic effect (1991)
    Springer
    Catalysis letters 10 (1991), S. 317-324 
    Details
    ISSN: 1572-879X
    Keywords: Isokinetic effect ; hexane H/D exchange ; selective energy transfer ; epitaxially produced catalysts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Kinetic data on the exchange reaction betwee hexane and deuterium have recently been reported by Maier and coworkers [1]. The reaction was catalysed by a series of platinum or rhodium systems, some of which had the property that the upper surface was shielded by a silica overlayer. The data are reinterpreted to indicate an isokinetic temperature of 580 K. This observation indicates that all the catalysts behave in a similar manner, which means that the exchange reaction does not require a free metal surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00772086
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  • 4
    Electronic Resource
    Electronic Resource
    Isokinetic effects in ethane hydrogenolysis and their relation to the mechanism of the reaction (1991)
    Springer
    Catalysis letters 11 (1991), S. 137-148 
    Details
    ISSN: 1572-879X
    Keywords: Ethane hydrogenolysis ; mechanism ; activation energies ; isokinetic effects ; platinum ; iridium ; iron and cobalt
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Literature data on the kinetics of ethane hydrogenolysis over metal catalysts are used to indicate the existence of isokinetic temperatures, Θ. For platinum Θ = 725 K, for Ni Θ is probably in the same temperature range. For Fe and Co on the other hand Θ is found at much lower values, about 330 K for Fe and 320 K for Co. From an analysis of the model of selective energy transfer, these values support the proposition of Sinfelt that the elements of high atomic number in one and the same transition metal series favour the splitting of the carbon-carbon bond as rate determining step, whereas those elements that have lower atomic numbers cause the splitting of the metal-carbon bond to be the rate determining step.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00764079
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  • 5
    Electronic Resource
    Electronic Resource
    The mechanism of ethane hydrogenolysis over ruthenium catalysts and the isokinetic effect (1992)
    Springer
    Catalysis letters 16 (1992), S. 273-285 
    Details
    ISSN: 1572-879X
    Keywords: Ethane hydrogenolysis ; isokinetic effect ; mechanism ; ruthenium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract An analysis has been made of the compensation effect observed for literature data on ethane hydrogenolysis over ruthenium catalysts. Using a previously derived expression for the isokinetic temperature it is concluded that the rate determining step is the breaking of the Ru-C bond. This is in accordance with recent views of Sinfelt. In order to substantiate this conclusion a recently published kinetics investigation is reconsidered. The results show two mechanisms, one for ethane/hydrogen pressures 〈 2, the other one for ethane/hydrogen pressures 〉 3. In both cases the rate determining step seems to be the Ru-C bond breaking.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00764340
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  • 6
    Electronic Resource
    Electronic Resource
    On transient species and activation energies in heterogeneous catalysis (1996)
    Springer
    Catalysis letters 36 (1996), S. 171-173 
    Details
    ISSN: 1572-879X
    Keywords: energy of activation ; heat of adsorption ; isokinetic temperature ; transient species ; precursors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A discussion is presented on the relation between true and apparent activation energies found in heterogeneous catalysis. The possibility of a transient species defining the rate determining step is emphasized. In such a case, the difference between apparent and true activation energies can be quite small. Such a condition is of importance for the understanding of phenomena involving the activation energy, such as the isokinetic effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00807615
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  • 7
    Electronic Resource
    Electronic Resource
    The mechanism of the ethane hydrogenolysis—a reconsideration of some kinetic data (1992)
    Springer
    Catalysis letters 13 (1992), S. 71-85 
    Details
    ISSN: 1572-879X
    Keywords: Hydrogenolysis ; ethane ; platinum ; nickel ; mechanism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract In order to justify the deduction made previously from isokinetic effects of ethane hydrogenolysis, i.e., that the rate determining step of this reaction on Pt and Ni is the C-C bond breaking of the chemisorbed C2H5 unit, some kinetic data from literature are scrutinized. It turns out that the variation of the observed rate with ethane and/or hydrogen pressure is such as predicted by the simple mechanism C2H5* + H* +n*→ CH3* + CH3* +n*, where n means the number of free sites (*) involved. From an analysis of the kinetic data it is shown thatn=1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00770949
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  • 8
    Electronic Resource
    Electronic Resource
    The charge distribution of iron complexes studied by XPS, Mössbauer spectroscopy, and SCC-MO calculations (1991)
    Springer
    Structural chemistry 2 (1991), S. (15)223 
    Details
    ISSN: 1572-9001
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A series of iron complexes has been studied by XPS and Mössbauer spectroscopy. Atomic charges and iron atom populations have been estimated from the experimental results and compared with iterative extended Hückel (IEH) calculations as well as with calculations based on a modified form of this method (MIEH).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00672218
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  • 9
    Electronic Resource
    Electronic Resource
    Catalysis as a resonance effect, V. Factors that determine the isokinetic temperature in catalytic reactions (1999)
    Springer
    Reaction kinetics and catalysis letters 68 (1999), S. 115-124 
    Details
    ISSN: 1588-2837
    Keywords: Resonance effect ; isokinetic temperature ; catalytic reactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract When describing isokinetic effects by the model of selective energy transfer by resonance, it is sometimes found that the frequency of the forcing oscillator is quite different to that of the reacting molecule,i.e.‘resonance’ is not a very good concept to use. By noting that the two frequencies thus found are related to each other as the ratios of small integers,e.g. 4∶3, this dilemma is resolved. The investigation covers formic acid decomposition, homogeneous ligand displacement reactions of Ni(DMSO)6 2+ and the dissociation of CO2 on metal surfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02475493
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  • 10
    Electronic Resource
    Electronic Resource
    Cohesive crack models for semi-brittle materials derived from localization of damage coupled to plasticity (1994)
    Springer
    International journal of fracture 69 (1994), S. 101-122 
    Details
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Based on discontinuous displacement approximation of the continuum and ‘shear band’ kinematics, two cohesive crack models are derived within the constitutive framework of coupled damage and plasticity. The models employ the Rankine fracture criterion, and the model parameters are determined from a uniaxial tension test (mode I cracking). Bifurcation analysis is used in order to diagnose critical directions along which the crack will gradually develop and propagate. These directions depend on the actual stress state and are kept fixed after fracture has initiated, whereby a ‘fixed crack’ model is obtained. A ‘discrete crack’ strategy is employed at the finite element implementation in the sense that interfaces (that represent the cohesive crack) are introduced along inter-element boundaries. This implementation strategy calls for gradual realignment of the mesh as a key feature of the algorithm. Numerical results from the analysis of mixed mode fracture in a notched concrete plate are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00035025
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