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  • 1975-1979  (6)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Influence of sodium salts on the catalytic properties of iron-molybdenum oxide catalysts in the oxidation of methanol to formaldehyde (1975)
    Springer
    Reaction kinetics and catalysis letters 3 (1975), S. 463-469 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Введение солей Na2MoO4, NaCl и NaNO3 в железомолибденовые катализаторы с атомным отношением Mo/Fe=2,5 и 1,5 в количестве до 0,4% вес Na приводит к уменьшению активности исходных образцов в 10–12 раз. Избирательность при этом не изменяется. В случае нанесенных катализаторов введение натрия приводит и к уменьшению избирательности. Предложено объяснение наблюдаемым явлениям.
    Notes: Abstract The introduction of Na2MoO4, NaCl and NaNO3 in amounts containing 0.4 wt.% Na into iron-molybdenum catalysts with a Mo/Fe atom ratio of 2.5 and 1.5 decreases the activity of the initial samples by a factor of 10 to 12. The selectivity remains unchanged. The introduction of sodium into supported catalysts leads also to a decrease in selectivity. An explanation of the observed effects is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02097993
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of excess molybdenum trioxide on the activity and selectivity of some molybdates in methanol oxidation (1976)
    Springer
    Reaction kinetics and catalysis letters 4 (1976), S. 323-328 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Введение избыточной трехокиси молибдена в нормальные молибдаты Na, Ca, Sr, Ni, Ba, Pb, Cr, Ca, Bi, Co и Fe в количестве 10% мол. приводит к существенному увеличению активности и избирательности в окислении метанола до формальдегида. При дальнейшем увеличении количества вводимой трехокиси молибдена активность и избирательность изменяются незначительно. Предположено, что этот эффект связан с образованием твердых растворов, в которых имеются атомы молибдена в разных состояниях.
    Notes: Abstract Addition of a 10 mol% excess of molybdenum trioxide to normal molybdates of Na, Ca, Sr, Ni, Ba, Pb, Cr, Cd, Bi, Co and Fe significantly increases the activity and selectivity in the oxidation of methanol to formaldehyde. Upon further increase of the amount of MoO3 the activity and selectivity vary but slightly. Probably, this effect is due to the formation of solid solutions containing molybdenum atoms in various states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02342573
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Errata (1976)
    Springer
    Reaction kinetics and catalysis letters 4 (1976), S. 487-487 
    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/BF02078641
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of excess MoO3 in a non-stoichiometric cadmium-molybdenum catalyst on the catalytic properties in methanol oxidation (1977)
    Springer
    Reaction kinetics and catalysis letters 6 (1977), S. 9-15 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Методами ИК, КР спектроскопии показано, что избыточный MoO3 закрепляется молекулярно на поверхности CdMoO4, вероятно в местах симметрии C2 и Ci. Это приводит к повышению каталитической активности и избирательности катализатора в реакции окисления метанола до формальдегида.
    Notes: Abstract By IR and Raman spectroscopy it has been shown that excess MoO3 is bound molecularly on the surface of CdMoO4, presumably on sites of C2 and Ci symmetry. This increases the activity and selectivity of the catalyst in methanol oxidation to formaldehyde.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02067733
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  • 5
    Electronic Resource
    Electronic Resource
    Activity, selectivity and oxygen binding energy on stationary surfaces of iron- and chromium-molybdenum catalysts in methanol oxidation (1975)
    Springer
    Reaction kinetics and catalysis letters 3 (1975), S. 209-214 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Сделано сравнение теплот адсорбции кислорода на железо- и хром-молибденовых катализаторах, приведенных в стационарное состояние при окислении метанола с одинаковыми концентрациями реагентов в газовой фазе. Показано, что при высокой энергии связи кислорода (75–90 ккал/моль) активность катализатора зависит в основном от активации молекулы метанола при её адсорбции. Величина изменения теплоты адсорбции по мере покрытия поверхности кислородом не влияет существенно на избирательность.
    Notes: Abstract A comparison was made of the heat of oxygen adsorption on iron- and chromium-molybdenum catalysts brought into a stationary state in methanol oxidation with the same concentration of reactants in the gas phase. It has been shown that at high oxygen binding energy (75–90 kcal/mol) the catalyst's activity depends mainly on methanol activation during its adsorption. Variations in the heat of oxygen adsorption with surface coverage do not appreciably affect the selectivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02187516
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  • 6
    Electronic Resource
    Electronic Resource
    Steady state catalytic properties and oxygen binding energy of cadmium-molybdenum catalysts in methanol oxidation (1977)
    Springer
    Reaction kinetics and catalysis letters 7 (1977), S. 229-233 
    Details
    ISSN: 1588-2837
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract На нормальном молибдате кадмия продуктами окисления метанола являются в основном CO2 и H2. После введения в него избыточной MoO3 до соотношения Mo/Cd=1, 2 окисление метанола идет до формальдегида и окиси углерода по последовательной схеме. Энергия связи кислорода в стационарном состоянии для 1-го образца на 30 ккал/моль выше, чем для второго, а энергии активации скоростей превращения метанола, соответственно, равны 11,5 и 20 ккал/моль.
    Notes: Abstract On normal cadmium molybdate the products of methanol oxidation are primarily CO2 and H2. After the introduction of excess MoO3 to reach Mo/Cd=1.2, methanol is oxidized to formaldehyde and carbon monoxide via a consecutive scheme. The oxygen binding energy in the steady state for the first sample is by 30 kcal/mol higher than that for the second catalyst. The activation energies of methanol conversion are 11.5 and 20 kcal/mol, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02061844
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    Paper (German National Licenses)
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