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  • 1980-1984  (7)
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Year
  • 1
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    Studies of catalytically active surface compounds (1984)
    Elsevier
    Details
    Publication Date: 1984-02-01
    Print ISSN: 0166-9834
    Electronic ISSN: 1873-3867
    Topics: Chemistry and Pharmacology
    Published by Elsevier
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    PAPER CURRENT
  • 2
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    Untersuchungen an katalytisch aktiven Oberfl�chenverbindungen. XI. Einflu� der Topologie der Silanolgruppen auf die Bildung von Vanadiumoxidclustern auf SiO2-Oberfl�chen (1983)
    Wiley
    Details
    Publication Date: 1983-07-01
    Print ISSN: 0044-2313
    Electronic ISSN: 1521-3749
    Topics: Chemistry and Pharmacology
    Published by Wiley
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of fluorine-modified SiO2-surfaces on the properties of V2O5/SiO2 catalysts (1981)
    Springer
    Reaction kinetics and catalysis letters 18 (1981), S. 443-448 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Было описано приготовление ванадиевых катализаторов, используя в качестве носителя Аэрозил, модичицированный фтором. Было показано, что модификация фтором изменяет концентрацию и топологию поверхностных силанольных групп и, вследствие этого, каталитические свойства.
    Notes: Abstract The preparation of vanadium catalysts is described using fluorine modified Aerosil as support. It is shown that modification with fluorine changes the concentration and topology of the surface silanol groups and, as a consequence, the catalytic properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02065640
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Studies on catalytically active surface compounds, VIII. On the reaction of VCl4 with aerosil (1981)
    Springer
    Reaction kinetics and catalysis letters 18 (1981), S. 465-471 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Было исследовано получение и гидролиз ванадиевых катализаторов, используя VCl4 в качестве парамагнитной пробы. Химическим анализом было показано, что молекула VCl4 реагирует однажды, дважды и трижды с гидроксильными группами поверхности. Температура предварительной обработки Аэросила влияет на тип реакции. ЭПР измерения указывают на искажение тетраэдрической координации поверхностного комплекса (SiO)nVCl4−n, который является самым сильным в случае трехкратного присоединения VCl4 к поверхности (n=3). Гидролиз сопровождается увеличением координационного числа и приводит к сильно подвижным ванадиевым частицам.
    Notes: Abstract The preparation and hydrolysis of silica supported vanadium catalysts have been investigated using VCl4 as a paramagnetic probe. Chemical analysis shows the possibility of the VCl4 molecule to react one, two, or three hydroxy groups of the surface. The type of reaction is influenced by the temperature of pretreatment of aerosil (TPA). ESR measurements show distortions of the tetrahedral coordination of the (SiO)nVCl4−n surface complex, which is strongest for the threefold attachment (n=3) of VCl4 to the surface. Hydrolysis is accompanied by an increase of the coordination number and leads to highly mobile vanadium species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02065644
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  • 5
    Electronic Resource
    Electronic Resource
    Studies on catalytically active surface compounds, IX. Formation of O 2 − radicals on VCl4/SiO2 catalysts (1981)
    Springer
    Reaction kinetics and catalysis letters 18 (1981), S. 473-478 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Были исследованы условия образования O 2 − на катализаторах VCl4/SiO2. Было показано, что термическая вакуумная обработка негидролизованных катализаторов приводит к частичному гидролизу поверхностного ванадиевого комплекса, вызванному силанольными группами носителя. Было найдено, что способность катализаторов генерировать радикалы O 2 − зависит от степени гидролиза, вызванного термической вакуумной обработкой.
    Notes: Abstract The conditions for the formation of O 2 − on VCl4/SiO2 catalysts have been investigated. It is shown that thermal vacuum treatment (TVT) of unhydrolyzed catalysts leads to partial hydrolysis of the surface vanadium complex caused by the silanol groups of the support. The ability of the catalysts to generate O 2 − radicals was found to depend on the degree of hydrolysis caused by thermal vacuum treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02065645
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  • 6
    Electronic Resource
    Electronic Resource
    Studies on catalytically active surface compounds, X. Alkali metal induced slow tumbling of vanadyl complexes on the surface of aerosil (1981)
    Springer
    Reaction kinetics and catalysis letters 18 (1981), S. 479-483 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Эффект примесей щелочных добавок (Li, Na, K, Rb и Cs) на катализаторы V/SiO2 был исследован методом ЭПР. Щелочные металлы сильно изменяют спектр VO2+. Восстановление приводит к спектрам, согласно которым происходит медленное вращательное движение частиц VO2+ на поверхности носителя. Предложенная интерпретация включает в себя предыдущие структурные модели и образование солей поливанадиевой кислоты.
    Notes: Abstract The effect of alkali metal admixtures (Li, Na, K, Rb, and Cs) on V/SiO2 catalysts was studied by ESR spectroscopy. Alkali metals strongly change the VO2+ spectra. Reduction leads to spectra showing a slow rotational motion of VO2+ species on the support surface. The proposed explanation includes former structural models and the formation of salts of polyvanadium acid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02065646
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  • 7
    Electronic Resource
    Electronic Resource
    Untersuchungen an katalytisch aktiven Oberflächenverbindungen. XI. Einfluß der Topologie der Silanolgruppen auf die Bildung von Vanadiumoxidclustern auf SiO2-Oberflächen (1983)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 502 (1983), S. 102-112 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on Catalytically Active Surface Compounds. XI. Influence of the Topology of Silanol Groups on the Formation of Vanadium Oxide Clusters on SiO2 SurfacesInteraction of VOCl3 dissolved in CCl4 with silanol groups of Aerosil gives rise to reaction products, the Cl/V-ratio of which depends on thermal pretreatment of Aerosil and the amount of the vanadium fixed on the surface.Geometrically different arrangements of the silanol groups (centers) show kinetically differing behaviour, thus giving the possibility to establish a mathematic model for the interpretation of experimental data. Quantitative estimation of the population with silanol groups depending on the annealing temperature is achieved and correlated with the existence of two vanadium oxide surface species which differ with respect to their catalytic activity.
    Notes: Die Umsetzung von VOCl3 in CCl4 mit den Oberflächensilanolgruppen von Aerosil-200 liefert Reaktionsprodukte, deren Cl/V-Verhältnis von der thermischen Vorbehandlung des Aerosils und der Menge des fixierten Vanadins abhängt. Das kinetisch unterschiedliche Verhalten geometrisch verschiedener Anordnungen von Silanolgruppen (Zentren) ermöglicht die Aufstellung eines mathematischen Modells zur Interpretation der Meßergebnisse. Es werden quantitative Angaben über Silanolgruppenpopulationen in Abhängigkeit von der Vorbehandlungstemperatur gewonnen und mit dem Auftreten zweier katalytisch unterschiedlich wirksamer Vanadinoxid-Oberflächenspezies korreliert.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19835020714
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