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  • catalyst circulation  (3)
  • kinetics  (3)
  • 23.20.-G  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Reinvestigation of the decay scheme of the short-lived isomeric states in112In (1990)
    Springer
    The European physical journal 336 (1990), S. 291-296 
    Details
    ISSN: 1434-601X
    Keywords: 23.20.-G ; 23.20.En ; 23.20.Lv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The two short-lived isomeric states in112In have been reinvestigated by means of the112Cd(d, 2n) and109Ag (α, n) reactions. Measurements of delayed X- andγ-ray, lifetime and TDPAD spectra have been performed. A 6.32(3) keVγ-ray has been identified in the isomeric decay and anM1 multipolarity has been assigned to it on the basis of the measured internal conversion coefficients:α L =196(39) andα tot=231(35). TheE1+M2(δ =+0.24(4)) andE2 multipolarities have been determined for the 263 and 188 keV transitions deexciting the 8−(T 1/2=2.82(2) μs) and 7+ (T 1/2=0.93(2) μs) isomeric states, respectively. A revised isomeric decay scheme is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292859
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Carbon states and kinetics of carbon deposition from ethylene at Pt(110) surface (1998)
    Springer
    Reaction kinetics and catalysis letters 65 (1998), S. 381-388 
    Details
    ISSN: 1588-2837
    Keywords: Carbon ; kinetics ; surface state ; XPS ; photoelectron spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The nature of high temperature carbon states at Pt(110) has been studied by X-Ray Photoelectron Spectroscopy. The formation of diamond-like carbon (DLC) is reported for the first time. The kinetics and temperature-programmed reactions of DLC were numerically simulated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02475279
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Modeling of oxygen adsorption on silver (1999)
    Springer
    Reaction kinetics and catalysis letters 66 (1999), S. 265-272 
    Details
    ISSN: 1588-2837
    Keywords: Oxygen ; surface ; silver ; kinetics ; modeling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Different adsorption forms of oxygen on silver are discussed. Four main types of oxygen forming at different temperatures and oxygen pressures have been distinguished. A kinetic model describing the formation and transformations of the oxygen forms and taking into account the surface amorphization has been proposed. Numerical modeling of stationary concentrations using this model gives evidence for a temperature window ΔT=500–800 K, where a quasimolecular oxygen state (E=530.5 eV, Tdes=800–900 K) can exist at high oxygen pressures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02475800
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  • 4
    Electronic Resource
    Electronic Resource
    Kinetics of carbon deposition from ethylene on Pt(110) surface (1997)
    Springer
    Reaction kinetics and catalysis letters 62 (1997), S. 299-304 
    Details
    ISSN: 1588-2837
    Keywords: carbon ; kinetics ; surface state
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The formation of carbonaceous deposits on Pt(110) surface due to ethylene decomposition in the temperature range of 770–970 K has been studied. Both kinetic and XPS data show that chemisorbed carbon (with no C−C bonds, but only C−Pt bonds) forms at T=770–870 K, the saturation coverage θs being about 1 ML. At higher temperatures, θs increases by a factor of 1.5, indicating the formation of more densely packed carbon species (DPC) due to C−C bonding. A kinetic model has been proposed to describe the process of carbon conversion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02475467
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  • 5
    Electronic Resource
    Electronic Resource
    Control of the selectivity in partial oxidation of hydrocarbons (1999)
    Springer
    Reaction kinetics and catalysis letters 66 (1999), S. 47-54 
    Details
    ISSN: 1588-2837
    Keywords: Partial oxidation ; hydrocarbons ; catalyst circulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A simple kinetic model for the partial oxidation of hydrocarbons on two types of sites was used to study the factors influencing the selectivity to the desired product. It is possible to increase the selectivity significantly by regulating the ratio of the surface concentrations of partial and deep oxidation sites by a periodic temperature treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02475740
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  • 6
    Electronic Resource
    Electronic Resource
    Multiplicity of regimes in a dual-reactor system for partial oxidation of hydrocarbons with the catalyst unsteady state (1999)
    Springer
    Reaction kinetics and catalysis letters 67 (1999), S. 213-218 
    Details
    ISSN: 1588-2837
    Keywords: Partial oxidation ; hydrocarbons ; catalyst circulation ; multiplicity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A mathematical modeling of a dual-reactor system based on a simple kinetic scheme with two types of sites (accounting for deep and partial oxidation) has been performed. It has been shown that it is possible to regulate the state of a catalyst in the reaction zone by varying the rate of the catalyst circulation between the reactors, thus, significantly increasing the reaction selectivity. A region of multiplicity of the process stationary regimes has been found. This region appeared to become smaller with the increase of the catalyst circulation rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02475850
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  • 7
    Electronic Resource
    Electronic Resource
    Spatial regulation of the catalyst activity enhancement for catalytic reactions with stop-effect (1999)
    Springer
    Reaction kinetics and catalysis letters 68 (1999), S. 393-398 
    Details
    ISSN: 1588-2837
    Keywords: Dual-reactor system ; “stop-effect” ; catalyst circulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A kinetic model taking into account two types of active sites has been used for an analysis of factors influencing the rate of a catalytic reaction. It has been shown that the reaction rate can be significantly increased by performing the reaction with the “stop-effect” in a dual-reactor system due to the catalyst circulation between two reactors, one of which is purged with an inert gas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02475529
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    Paper (German National Licenses)
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