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  • 1
    Electronic Resource
    Electronic Resource
    Structural stabilisation of (CoO)x clusters in ZSM5 zeolites (1996)
    Springer
    Catalysis letters 39 (1996), S. 119-123 
    Details
    ISSN: 1572-879X
    Keywords: (CoO) x /ZSM5 ; (CoO) x /SiO2 ; clusters in zeolites ; simulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The structure and stability of (CoO) x clusters in siliceous ZSM5 (silicalite) and on SiO2 have been investigated using atomistic simulation techniques. The deconvolution of the energy into distortion and interaction contributions revealed that the improved stability of the supported clusters is due to the energy gained from the cluster-host interaction. (CoO) x clusters in ZSM5 of between 4 and 6 Co atoms showed an enhanced stability, while clusters larger than 18 Co atoms were sterically limited inside the zeolite lattice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00813740
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Carbonium ion formation in zeolite catalysis (1994)
    Springer
    Catalysis letters 27 (1994), S. 91-96 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF00806981
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Changes in the oxidation state of transition metal containing MCM-41 during deNOx reactions (1997)
    Springer
    Catalysis letters 47 (1997), S. 193-198 
    Details
    ISSN: 1572-879X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The oxidation state of Co, Pt and Rh containing MCM-41 after co-adsorption of NO, CH4, and O2 in the presence of water vapor was studied by in situ XANES experiments. All catalysts were oxidized after the adsorption of NO and reduced after the co-adsorption of NO and CH4. The presence of water vapor did not influence the oxidation/reduction of Rh/MCM-41 and Pt/MCM-41, while Co/MCM-41 was oxidized by the presence of H2O at reaction temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019085828082
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Acid behavior of SiO2−Al2O3 mixed oxides (1980)
    Springer
    Reaction kinetics and catalysis letters 14 (1980), S. 273-278 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF02073490
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  • 5
    Electronic Resource
    Electronic Resource
    EPD-EPA strength of catalysts, activity and selectivity in elimination reactions (1976)
    Springer
    Reaction kinetics and catalysis letters 4 (1976), S. 173-178 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Как было показано с помощью ФЭС кислотность для Mg+2 повышается в ряду MgO, MgSO4 и MoHPO4, в то время как основность для этих анионов уменьшается. Бутанол селективно дегидратируется над MgSO4 и MgHPO4 и дегидрируется над MgO. Приводится объяснение, согласуемое с ранними заключениями относительно реакций выделения.
    Notes: Abstract As shown by ESCA, the EPA strength of Mg2+ increases in the series MgO, MgSO4 and MgHPO4, whereas the EPD strength of the anions decreases. Butanol is selectively dehydrated over MgSO4 and MgHPO4, and dehydrogenated over MgO. An explanation consistent with former concepts about elimination reactions is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02061995
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Apparent inconsistencies in acid-base behavior of ZnO (1980)
    Springer
    Reaction kinetics and catalysis letters 15 (1980), S. 21-25 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Обнаружен кислотный характер ZnO в спекроскопических измерениях (полоса Zn−H при 1708 см−1, XPS O 1s связывающая энергия имеет значение 530/532 э.в., Люисова полоса пиридина при 1452 см−1), а также основной характер в реакциях спиртов (98% дегидрования). Это объясняется высокой чувствительностыо катализатора к условиям эксперимента.
    Notes: Abstract Acidic behavior of ZnO is observed in spectroscopic experiments (Zn−H band at 1708 cm−1, XPS O 1s binding energy 530/532 eV, pyridine Lewis band at 1452 cm−1), basic behavior in catalytic reactions of alcohols (98% dehydrogenation). This is ascribed to a high sensitivity to experimental conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02062379
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    Paper (German National Licenses)
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