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  • Chemistry  (107)
  • General Chemistry  (69)
  • High-pressure chemistry  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 337 (1995), S. 109-112 
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The Decisive Cooperation of Metal and Oxygen Ions of Nickel Oxide During the Oxidation of o-XyleneAs can be concluded from the experimental results at 450°C in the reaction mixtures consisting of N2—O2-o-Xylene, both nickel oxide pure and doped with Li2O or In2O3 is unsuited as catalyst for the oxidation of o-xylene to phthalic anhydride. In contrast to NiO which ionosorbs both oxygen and o-xylene, NiO—Li2O, a strong ionosorbent for o-xylene, prevents the ionosorption of oxygen because of the large concentration of holes. Since gaseous oxygen does not react with ionosorbed o-xylene but a reduction of nickel oxide to metallic nickel has been observed in spite of the fact of enough oxygen in the gas phase it can be assumed that o-xylene is forced to remove oxygen ions from the NiO lattice under generation of oxygen-ion vacanxies and nickel atoms. The predominant portions of the reaction products are H2O and CO2. With undoped nickel oxide and NiO—In2O3 which were not reduced under the same experimental conditions, the reaction products had roughly the same composition.The reduction of NiO—Li2O however will be prevented in a gas mixture with a high oxygen pressure which oxidizes the formed nickel atoms on the surface of NiO—Li2O to nickel oxide making possible the entrance of oxygen from the gas phase and, therefore, the oxidation of o-xylene.A turbulent motion of a 2-component catalyst powder from NiO-1mole% Li2O covered with ionosorbed o-xylene and ZnO-1mole% In2O3 covered with ionosorbed oxygen in the same gas mixture resulted in the same reaction products as in the presence of sole NiO—Li2O under simultaneous reduction of nickel oxide. From that we can conclude that the oxidation of o-xylene by oxygen ions of NiO occurs more easily than the reaction with ionosorbed oxygen on ZnO—In2O3 which obviously seems to be bounded too strongly. This result is also confirmed by the prevention of the oxidation of gaseous o-xylene in the presence of only ZnO—In2O3.Finally, the operation of the carrier catalyst V2O5/TiO2 which is employed for the oxidation of o-xylene to phthalic anhydride will be prevented to a large extent in simultaneous presence of nickel oxide either pure or doped with Li2O and In2O3 in roughly the same amount. This result can be mentioned as a proof for the interaction of a 2-component catalyst the mechanism of which is at present not satisfactorily understood.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 62 (1950), S. 269-269 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 63 (1951), S. 356-357 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 68 (1956), S. 620-620 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 68 (1956), S. 436-437 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Für die Photometrische Bestimmung wird Kobalt als blaues Tri-n-butyl-ammoniumrhodano-kobaltat (II) gefällt und mit Amylalkohol extrahiert. Die gut reproduzierbare Färbung folgt dem Lambert-Beerschen Gesetz bei der Messung bei 620 mμ. Bei Zusatz von Alkalifluorid und Natriumthiosulfat wird die Bestimmung neben Fe3+, Bi3+, Cu2+- und anderen lonen weitgehend selektiv und daher allgemein anwendbar.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 69 (1957), S. 91-93 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Eisenoxyd läßt sich für die chromatographische Adsorption bequem in den verschiedensten Aktivitätsstufen herstellen, wobei der Aktivitätsbereich und die Selektivität weit größer als bei Aluminiumoxyd sind. An der Reinigung und Trennung von Kohlenwasserstoffen und Extrakten von Streptomyces-Kulturen wird die Brauchbarkeit der Präparate für hohe und höchste Aktivitäten, an der Reinigung und Trennung von Polyoxy-anthrachinonen, selbst isomerer Polyoxy-anthrachinone, auch für geringe Aktivitäten aufgezeigt.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 69 (1957), S. 174-177 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es werden Vorschriften zur photometrischen Bestimmung des Eisens als Tributylammonium-hexarhodanoferrat(III) sowie als Tributylammonium-eisen(III)-ferronat mitgeteilt. Ihre Anwendung auf die Reinheitsprüfung von Chemikalien, von Leichtmetallegierungen, von Messing, technisch gebrauchten Oxyden, Gläsern, Gesteinen und Tonen wird beschrieben und beide Verfahren werden miteinander verglichen. Beachtlich ist die geringe Störanfälligkeit durch Fremd-lonen, die Grenzverhältnisse z. B. von 1:1000 000 für Fe: Al bei der Bestimmung von etwa 2 μ Fe zuläßt.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 73 (1961), S. 785-805 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die bei Verbindungen der Systeme Oxyd-Wasser erzielten neuen Ergebnisse ermöglichen eine Systematik, die das gesamte Gebiet unter Berücksichtigung der drei Aggregatzustände unter einem einheitlichen Gesichtspunkt zusammenfaßt. Nach der Art der Wasserbindung werden vier Haupttypen unterschieden: Hydroxyde, Oxydhydrate, Hydronium-Verbindungen und Oxydaquate. Der Stand der Forschung wird in den Kapiteln „Gasförmige Hydroxyde“, „Verbindungen durch hydrothermale Synthese“, „Niederwertige Hydroxyde der Übergangsmetalle“ und „Aufbau von festen Aquoxyden“ beschrieben, die als Schwerpunkte der modernen Entwicklung des Gebietes angesehen werden.
    Additional Material: 22 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 73 (1961), S. 634-635 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 67 (1955), S. 427-428 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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