Über binäre Molybdän-Mischkatalysatoren bei der Ammoniaksynthese

Mittasch, Alwin; Keunecke, E.

doi:10.1515/zpch-1931-s161

Cited by 6 publications

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“…In this process, a mixture of Fe 3 O 4 , Al 2 O 3 , and K 2 O is used as a catalyst. Fe 3 O 4 has a good catalytic effect on this hydrogen absorption and dissociation reaction, and Al 2 O 3 has a function to prevent sintering of Fe 3 O 4 in this process without showing any catalytic effect 32. These catalytic activities of Fe 3 O 4 and Al 2 O 3 in the synthesis process of ammonia are very similar to the results on the hydrogen desorption reaction of MgH 2 , as shown in Figure 4(b).…”

Section: Resultssupporting

confidence: 71%

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Quantitative approach to the understanding of catalytic effect of metal oxides on the desorption reaction of MgH₂

Hirate¹,

Saito²,

Nakaya³

et al. 2009

Int J of Quantum Chemistry

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ABSTRACT:The hydrogen desorption reaction of magnesium hydride (MgH 2 ), MgH 2 3 MgϩH 2 , is accelerated by mixing catalytic metal oxides (e.g., Nb 2 O 5 ). This catalytic effect of metal oxides, MxOy, is theoretically estimated in a quantitative way using atomization energy concept. The atomization energies, ⌬E M for metal ion and ⌬E O for oxide ion in various metal oxides are evaluated using the energy density analysis of the total energy. It is shown that the hydrogen desorption rate increases monotonously with increasing y ϫ ⌬E O values of metal oxides. This indicates that the oxide ion in MxOy interacts mainly with hydrogen atoms in MgH 2 . The y ϫ ⌬E O value is a measure of the magnitude of the OOH interaction operating between MxOy and MgH 2 , and hence, it is indeed a good parameter to show the catalytic activities of metal oxides. This approach is useful for the analysis of other catalyst and catalytic reactions.

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Section: Resultssupporting

confidence: 71%

“…Concerning the oxide catalyst, there is a famous Haber‐Bosch process 32 to synthesize ammonia, N 2 +3/2H 2 →NH 3 . In this process, a mixture of Fe 3 O 4 , Al 2 O 3 , and K 2 O is used as a catalyst.…”

Section: Resultsmentioning

confidence: 99%

Quantitative approach to the understanding of catalytic effect of metal oxides on the desorption reaction of MgH₂

Hirate¹,

Saito²,

Nakaya³

et al. 2009

Int J of Quantum Chemistry

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“…Mittasch and Keunecke have shown that iron oxide and alumina form mixed crystals, which diminish the possibility of reduction and augment the activity of the catalyst (89). Numerous technical methods are used to obtain great porosity; one of the methods most used is the addition of inert porous materials, such as alumina, infusorial silica, and pumice stone, in the preparation of the catalyst, These carriers are not always completely inert.…”

Section: Proceedings At the Surface In The Process O F Sorption; Actimentioning

confidence: 99%

The Mechanism of Heterogeneous Catayltic Organic Reactions. I. Catalytic Hydrogenation.

Schmidt¹

1933

Chem. Rev.

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The process of catalytic hydrogenation of organic compounds is of great interest, not only industrially but also scientifically.It comprises the hydrogenation of fatty substances, the hydrogenation of carboxides with formation of methanol, and a host of other important chemical processes. I n order to master these reactions the most important step is to understand their mechanism.I n hydrogenating fatty oils one or more double bonds between carbon atoms are converted into single bonds ; in hydrogenating carboxides one or more double bonds between carbon and oxygen atoms are reduced. This seems to be a close analogy; nevertheless the mechanism of the two processes is probably quite different, as we shall see later.We consider first the mechanism of the hydrogenation of multiple carbon bonds. For a long time I have adhered to the theory (1) that catalytic hydrogenation of multiple carbon bonds belongs to the great class of catalytic reactions that are produced by ions. I am glad now to have the opportunity of surveying the facts which seem to me to prove that ionic catalysis is involved in this type of hydrogenation.But first, what is ionic catalysis? Ostwald (2) and Arrhenius (3) were the first to find that ions 1 This is the first of a series of three articles. 11, The Dissociation of Carbon Bonds, is scheduled for publication in

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Katalytische Wirkung Intermetallischer Phasen und Ihrer Mischungen

Schwab¹,

Karatzas²

1944

Zeitschrift für Elektrochemie und angewandte physikalische Chem

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Über binäre Molybdän-Mischkatalysatoren bei der Ammoniaksynthese

Cited by 6 publications

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Quantitative approach to the understanding of catalytic effect of metal oxides on the desorption reaction of MgH₂

Quantitative approach to the understanding of catalytic effect of metal oxides on the desorption reaction of MgH₂

The Mechanism of Heterogeneous Catayltic Organic Reactions. I. Catalytic Hydrogenation.

Katalytische Wirkung Intermetallischer Phasen und Ihrer Mischungen

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Über binäre Molybdän-Mischkatalysatoren bei der Ammoniaksynthese

Cited by 6 publications

References 0 publications

Quantitative approach to the understanding of catalytic effect of metal oxides on the desorption reaction of MgH2

Quantitative approach to the understanding of catalytic effect of metal oxides on the desorption reaction of MgH2

The Mechanism of Heterogeneous Catayltic Organic Reactions. I. Catalytic Hydrogenation.

Katalytische Wirkung Intermetallischer Phasen und Ihrer Mischungen

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Quantitative approach to the understanding of catalytic effect of metal oxides on the desorption reaction of MgH₂

Quantitative approach to the understanding of catalytic effect of metal oxides on the desorption reaction of MgH₂