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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 88 (1984), S. 905-912 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 8777-8781 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 12327-12331 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1572-879X
    Keywords: Pt-catalysts ; adsorption of aldehydes and alcohols ; XANES
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The variation of the X-ray absorption coefficient above the Pt-LIII edge after adsorption of crotonaldehyde, butyraldehyde, crotylalcohol and butanol on a Pt/SiO2 catalyst was studied by means of X-ray absorption spectroscopy. The adsorption of these molecules caused the intensity of the white line to decrease in the order CrHO〉CrOH∼BuHO≫〉BuOH. From this we concluded that adsorbed unsaturated compounds donate electrons from their double bonds to Pt. The magnitude of the observed effects was approximately equal for the C=O and the C=C group. Over the Pt/SiC2 catalysts studied, crotonaldehyde was concluded to be adsorbed via both double bonds. The interaction of the free electron pairs of the oxygen was concluded to be significantly weaker than the interaction of the electrons in the π-bonds.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Catalysis letters 27 (1994), S. 91-96 
    ISSN: 1572-879X
    Keywords: n-alkane conversion ; carbonium ions ; cracking ; dehydrogenation ; alkane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Based on data ofn-butane conversion over HZSM5, different transition states are proposed for the Brønsted acid catalyzed reactions of alkanes involving carbonium ions as intermediates. Hydrogen-deuterium exchange, dehydrogenation and cracking are proposed to proceed via pentacoordinated carbonium ions that are stabilized by the zeolite lattice.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Reaction kinetics and catalysis letters 14 (1980), S. 273-278 
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract С помощью ИК-спектроскопии и каталитических измерений была исследована кислотность поверхности смешанных окислов кремния и алюминия. Чистая окись алюминия является наиболее активным катализатором превращения бутан-I-ола, в то же время побочная реакция E1 возрастает с увеличением содержания SiO2. Был сделан вывод о том, что чнсло кислотных центров возрастает при увеличении содержания Al2O3, а сила кислотных центров-с увеличением содержания кремнеокисного компонента.
    Notes: Abstract Surface acidity of a series of silica-alumina mixed oxides have been investigated by IR-spectroscopy and catalytic measurements. Pure alumina was the most active catalyst in the conversion of butan-1-ol, but the E1 part in the reaction increased with increasing SiO2 content. It was concluded that the number of acidic sites increased with increasing Al2O3 content, while the strength of the acidic sites with the silica content.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Reaction kinetics and catalysis letters 20 (1982), S. 409-413 
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Смешанные окислы алюминия и магния были охарактеризованы с иомощью ИК исследований адсорбции пиридина. Были детектированы три различных типа центра, кислот Льюиса, а не центры типа кислот Брёнстэда. Наиболее сильные центры адсорбции приписывались катионам Al+3 алюминиевой фазы (1455 см−1), а центры слабых кислот Льюиса приписывались катионам фазы MgAl2O4 (1443 см−1) и фазы MgO (1438 см−1).
    Notes: Abstract Mixed oxides of alumina and magnesia were characterized by an IR study of pyridine adsorption. Three different Lewis acid sites, but no Brönsted acid sites were detected. The strongest adsorption sites are attributed to Al3+ cations of the alumina phase (1455 cm−1), the weaker Lewis acid sites were assumed to be due to cations of the MgAl2O4 phase (1449–1443 cm−1) and the MgO phase (1440–1438 cm−1).
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Reaction kinetics and catalysis letters 23 (1983), S. 365-370 
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Изучалось влияние активности смешанных окислов MgO−Al2O3 на распад диацетоналкоголя. Измерения проводились в микрореакторе, который позволял проводить предварительную обработку катализатора непосредственно в реакторе. Скорость реакции была использована как характеристика прочности основных поверхностных центров. Наблюдался первый порядок реакции и у меньщении скорости реакции от MgO к Al2O3.
    Notes: Abstract The activity of MgO−Al2O3 mixed oxides in the decomposition of diacetonealcohol was studied using a micro slurry reactor, which allowed pretreatment of the catalyst in situ. The rate constant was used to characterize the strength of the basic surface sites. A reaction order of one and a decrease of the rate constant from MgO to Al2O3 was observed.
    Type of Medium: Electronic Resource
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