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  • 11
    Electronic Resource
    Electronic Resource
    Zur Redoxwertigkeit des Sauerstoffs an Nickelproben in 1 n Salz-und Schwefelsäure (1976)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 27 (1976), S. 506-509 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Redox valence of oxygen on nickel specimens in 1 n hydrochloric and sulfuric acidsThe ratio of dissolved nickel to oxygen consumption was studied for the corrosion of nickel in oxigen containing acid. In air saturated 1 N H2SO4 4 electrons are accepted per molecule of oxygen (reduction to water). In air-saturated 1 N HCL only 2 electrons are reacting per molecule of oxygen (reduction to hydrogenperoxide) at the beginning of the reaction, in the course of the reaction (times greater than 2 hours) this value rises to 3 electrons per molecule of oxygen, according to a stationary hydrogenperoxide concentration of 7 · 10-4 moles/l in both acid, however, the oxygen reduction leads to hydrogen peroxide as an intermediate product which in the presence of chloride ions is desorbed faster from the metal surface than it is reduced. with increasing chlorid concentration the corrosion rate decreases from H2SO4 to HCL solutions.It is proposed that this effect is due to different mechanisms for the anodic dissolution of the nickel.
    Notes: Bei der Korrosion von Nickel in sauerstoffhaltiger Säure wurde das Verhältnis der in lösung gegangenen Nickelmenge zum Sauerstoffverbrauch untersucht. In luftgesättigter 1 N H2SO4werden pro reduziertem Sauerstoffmolekül 4 Elektronen verbraucht (Reduktion zu Wasser). In luftgesättigter 1 N HCL reagieren zu Beginn der Reaktion 2 Elektronen pro Molekül Sauerstoff (Bildung von Wasserstoffperoxiden), für Reaktionszeiten von mehr als 2 Stunden steigt der Wert auf 3 Elektronen an, entsprechend einer stationären Peroxidkonzentration im Elektrolyten von 7 · 40-4moles/l. Sowohl in H2SO4 als auch in HCL verläuft der Mechanismus der Sauerstoffreduktion über Wasserstoffperoxid als Zwischenprodukt, das in Gegenwart von Chloridionen schneller von der Metalloberfläche desorbiert wird als es weiterreagiert. Mit zunehmendem Chloridgehalt sinkt die Korrosionsgeschwindigkeit beim Übergang von Schwefelsäure in Salzsäure; dies wird auf unterschiedliche Mechanismen für die Nickelauflösung in den beiden Säuren zurückgeführt.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19760270706
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  • 12
    Electronic Resource
    Electronic Resource
    Effects of radioactivity on surfaces, I. Influence of Cr-51 on the catalytic activity of chronium catalysts (1981)
    Springer
    Reaction kinetics and catalysis letters 17 (1981), S. 195-195 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02069541
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  • 13
    Electronic Resource
    Electronic Resource
    Effects of radioactivity on surfaces: I. Influence of Cr-51 on the catalytic activity of chromium catalysts (1980)
    Springer
    Reaction kinetics and catalysis letters 14 (1980), S. 367-373 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Были приготовлены катализаторы хрома на монолитных подлозках, некоторые из которых имели на поверхности радиоактивный Cr-51. Для сравнения каталитической активности радиоактивных и инактивных катализаторов била использована реакция гидрогенизации-дегирогенизации циклогексена. При низких температурах била замечена разница в распределении главных продуктов, а при высоких температурах — и главных, и побочных продуктов.
    Notes: Abstract Chromium catalysts were prepared on monolith supports, some of them with radioactive Cr-51 in the surface. The dehydrogenation-hydrogenation reaction of cyclohexene was used to compare the catalytic activities of the radioactive and inactive catalysts. Differences were observed in the distribution of the main products at low temperatures and of the byproducts also at high temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02073507
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  • 14
    Electronic Resource
    Electronic Resource
    Antimony-121 Mössbauer spectra of organoantimony derivatives containing Sb-Sb bonds (1994)
    Springer
    Hyperfine interactions 90 (1994), S. 505-508 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract 121-Sb Mössbauer data are reported for a number of organoantimony rings and catena-stibanes. These compounds are representative of RSb(Sb)2 and R2SbSb type of coordination, and spectral parameters are compared and discussed in relation to RSbCl2 and R2SbCl systems. Although the trend in isomer shift is similar, the present compounds show slightly less negative isomer shift values together with a remarkable reduction of the quadrupolar coupling constant. A rationalization of the quadrupolar interaction in the above series of compounds appears feasible by using point charge model calculations whose results, in terms of bonding, indicate a large contribution of p-electron density along Sb-Sb bonds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02069163
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  • 15
    Electronic Resource
    Electronic Resource
    Über die reaktionstechnische Behandlung biochemischer ReaktionenErweiterte Fassung eines Vortrages auf dem 2. Symposion „Technische Mikrobiologie“, 14. bis 17. April 1970 in Berlin. (1971)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 43 (1971), S. 50-55 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Für reaktionstechnische Berechnungen von biochemischen Reaktionen wird, wie beiüblichen chemischen Reaktionen, zunächst ein „formaler Mechanismus“ aufgestellt, der den Chemismus des Reaktionsgeschens wiedergibt und aus dem mit Hilfe der kinetischen Zusammenhänge die Reaktionsgeschwindigkeit in Abhängigkeit von den äßeren Bedingungen berechnet werden kann. Die Mechanismen einfacher enzymatischer Reaktionen sind analog denen heterogen-katalysierter Reaktionen; sie werden bei Beteiligung mehrerer Ausgangskomponenten und Effektoren wegen der großen Reaktionsvariabilität und Spezifität der Enzyme jedoch schnell komplex. Für die Ableitung der Geschwindigkeitsgleichungen wird stets die quasistationäre Methode angewandt. Mit den Reaktionsenthalpien können dann über Berechnungen des Wärmehaushalts Angaben über Größe und Form von Reaktoren gemacht und damit die Grenzfälle verschiedener Verfahrensweisen diskutiert werden.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330430110
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  • 16
    Electronic Resource
    Electronic Resource
    Synthesen und Kristallstrukturanalysen von Tetraalkylphosphonium-, -arsonium- und -stiboniumtriiodidenProfessor Walter Siebert zum 60. Geburtstag gewidmet (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 1151-1156 
    Details
    ISSN: 0044-2313
    Keywords: Tetraalkyl phosphonium triiodide ; tetraalkyl arsonium triiodide ; tetraalkyl stibonium triiodide ; crystal structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses and Crystal Structure Analyses of Tetraalkyl Phosphonium, Arsonium, and Stibonium TriiodidesThe reaction of Me4EI (E=P, As), Me3EtSbI, Me2Et2SbI, MeEt3SbI, or Et4SbI with I2 in absence of solvent gives Me4PI3 (E=P, As), Me3EtSbI3, Me2Et2SbI3, MeEt3SbI3, or Et4SbI3. Me4SbI3 is formed in a reversible reaction by addition of I2 to (Me4Sb)3I8 or by reaction of a solution of Me4SbI in ethanol with I2 in benzene. The crystal structures of Me4EI3 (E=P, Sb), and Me3EtSbI3 and the syntheses of the novel compounds are reported.
    Notes: Die Reaktion von Me4EI (E=P, As), Me3EtSbI, Me2Et2SbI, MeEt3SbI oder Et4SbI mit I2 im Substanzgemisch ohne Lösungsmittel führt zu den entsprechenden Triiodiden Me4EI3 (E=P, As), Me3EtSbI3, Me2Et2SbI3, MeEt3SbI3 oder Et4SbI3. Me4SbI3 entsteht in reversibler Reaktion durch Zugabe von I2 zu (Me4Sb)3I8 oder durch Umsetzung einer ethanolischen Lösung von Me4SbI mit einer Lösung von Iod in Benzol. Über die Kristallstrukturen von Me4EI3 (E=P, Sb) und Me3EtSbI3 und die Synthese der neuen Verbindungen wird berichtet.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19976230724
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  • 17
    Electronic Resource
    Electronic Resource
    Zum Mechanismus des Abbaus von Polymeren in Lösung durch Ultraschall (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 86 (1974), S. 449-450 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19740861215
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  • 18
    Electronic Resource
    Electronic Resource
    Origin of branches in native dextrans (1967)
    New York : Wiley-Blackwell
    Biopolymers 5 (1967), S. 423-430 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: According to the proposed mechanism for the enzymatic formation of dextran, branches of different length are formed in a reaction between a so-called acceptor dextran molecule and an active reaction complex; propagation of the dextran chain occurs by an insertion-type polymer growth. To investigate this branching reaction, radioactive labeled acceptor dextran of relatively low molecular weight was added to a dextran synthesizing system and the native high molecular weight dextran separated by a fractionation method. From the specific radioactivity of the isolated native dextran, and assuming a molecular weight of 2.5 × 105, the average number of acceptor molecules incorporated into native dextran is calculated to be about unity, as predicted by the proposed mechanism. Analogous results have been obtained in the reaction of two different dextran sucrases from Leuconostoc mesenteroides B512F and B1307, respectively.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1967.360050503
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  • 19
    Electronic Resource
    Electronic Resource
    Eichung einer Baker-Williams-Kolonne über Ultrazentrifugenmessungen (1964)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 76 (1964), S. 351-351 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19640760832
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  • 20
    Electronic Resource
    Electronic Resource
    The thermal decomposition of n-hexane (1983)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 15 (1983), S. 475-502 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The kinetics of the pyrolysis of n-hexane was studied in a conventional static reactor over a temperature range of 650-840 K. The overall reaction is essentially first order with the kinetic parameters A = 1013.92 s-1 and EA = 260.3 kJ/mol. The distributions of the main products were analyzed by gas chromatography. A reaction model involving 240 elementary reactions was developed to describe the experimental rate data. The agreement of the model with experimental data was surprisingly good over a wide range of temperatures and pressures and up to medium extents of conversion. Methods for sensitivity studies based upon the quasi-stationary-state assumption (QSSA) were developed, and for a number of more detailed effects, such as self-inhibition, explanations could be given. It was also shown that the hexyl isomerization reactions influence strongly the product distribution. The outstanding capability of kinetic modeling with computer simulations in handling complex kinetic systems is demonstrated.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550150508
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