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  • 1
    Electronic Resource
    Electronic Resource
    On the Jovanovic model of adsorption I. An extension for mobile adsorbed layers (1977)
    Springer
    Colloid & polymer science 255 (1977), S. 869-880 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Außer dem Massenaustausch übt die gleichgewichtige freie Gasphase einen hydrostatischen Druck auf die adsorbierte Phase aus: dieser hydrostatische Druck ist eine Quelle einer zusätzlichen positiven Adsorption. Die kinetische Ausführung von Jovanovic ist die erste, die den mechanischen Kontakt zwischen den adsorbierten und freien Phasen in Betracht zieht im Falle von Systemen mit lokalisierten Admolekülen ohne gegenseitige Wirkung. Mit derselben Bedeutung und numerischen Wertender Parameter sagt die Jovanovic-Isotherme eine größere Adsorption als die Gleichung von Langmuir voraus.
    Notes: Summary In addition to the mass exchange the equilibrium bulk phase exerts a hydrostatic pressure on the adsorbed phase: this hydrostatic pressure is a source of an additional positive adsorption. The Jovanovic kinetical derivation is the first one taking into account the mechanical contact between adsorbed and bulk phases in the case of the systems with localized admolecules without mutual interactions. At a same numerical values of parameters the Jovanovic isotherm predicts a greater adsorption than the Langmuir does.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01617094
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  • 2
    Electronic Resource
    Electronic Resource
    On the Jovanovic model of adsorption (1977)
    Springer
    Colloid & polymer science 255 (1977), S. 1086-1097 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary The effect of the hydrostatic pressure exerted by bulk phases on adsorbed phases depends on the mobility of adsorbed phase and on the topographical distribution of adsorption energy. It is shown in this paper that the Langmuir's equation applies also to adsorption of fully mobile hard discs, on heterogeneous surfaces having fully random topographical distribution of adsorption energy. The effects of the hydrostatic pressure are discussed also in the case of heterogeneous surfaces exhibiting patchwise topographical distribution of adsorption energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01549895
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  • 3
    Electronic Resource
    Electronic Resource
    Quantitative estimation of adsorbent heterogeneity by gas chromatography (1975)
    Springer
    Chromatographia 8 (1975), S. 633-639 
    Details
    ISSN: 1612-1112
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary It has been shown by Waksmundzki and Rudzinski that gas chromatography has many advantages over other methods of generating experimental data used to evaluate the adsorption energy distribution of heterogeneous surfaces. However, the approach to the interperation of such data proposed previously was based on the use of the original condensation approximation. An improvement on this method is proposed here. The new procedure yields a slightly different but, we feel, more correct picture of the energy distribution, while preserving the basic advantages of the chromatographic technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02286261
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  • 4
    Electronic Resource
    Electronic Resource
    Kinetics of the formation of primary products of cumeme cracking over a partially exchanged LaY-Zeolite (1981)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 13 (1981), S. 883-895 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The kinetics of formation of primary products from cumene cracking over a partially exchanged LaNaY catalyst have been studied at 400, 450, and 500°C. It has been found that in both the fully and the partially exchanged LaNaY zeolite catalysts the nature of active sites is the same. The higher activity of the fully exchanged catalyst is attributed to a higher concentration of the active sites. It has also been found that an increase in exchange level leads to an increase in the number of both Bronsted and Lewis active sites, but in somewhat different proportions. A comparatively slight increase in the decay rate constant is observed over the same increase in the level of exchange.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550130912
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  • 5
    Electronic Resource
    Electronic Resource
    Catalytic isomerization of 1-hexene on hy zeolite (1983)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 15 (1983), S. 1249-1274 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The isomerization of 1-hexene on 70/80 mesh HY zeolite was studied at 200°C. The observed reaction products are formed via a variety of processes including double bond shift, cis-trans isomerization, skeletal rearrangement, cracking, hydrogen transfer, polymerization, cyclization, and coke formation. By applying the time-on-stream theory, the products have been classified as primary, secondary, or both, according to their OPE curves on product selectivity plots. 2-Ethyl-1-butene, which is present as an impurity in the feed, is found to react about 30 times faster than 1-hexene. Both 2-hexenes and 3 hexenes are formed primarily from 1-hexene, while 3 methyl 2 pentenes and 3-methyl-1-pentene formed from 2-ethyl-1-butene. The ratio of the initial rate of deprotonation to that of hydrogen shift in these reactions is ∼15 and ∼100, respectively. All products of skeletal rearrangement are observed to be secondary. Cracking products are produced mainly from precoke, which is also the source of hydrogen in the formation of paraffins. A detailed reaction network along with its associated mechanisms are presented and discussed.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550151202
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    Paper (German National Licenses)
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