�ber den Entwicklungsgang der Sterne

Brill, A. A.

doi:10.1007/bf01328513

Cited by 4 publications

(12 citation statements)

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“…This effect, which fitted well with the present explanations about nitridation (see Section 12.1.3.5), was described earlier in model experiments with iron tips in field emission microscopy studies [102,103]. This effect, which fitted well with the present explanations about nitridation (see Section 12.1.3.5), was described earlier in model experiments with iron tips in field emission microscopy studies [102,103].…”

Section: 1 Reference Experimentssupporting

confidence: 87%

“…N − N stretching vibrations of 1600 cm −1 and N − N bond distances of 135 pm (significantly elongated compared to 109.8 pm for gaseous dinitrogen) have been recorded [186]. The specific spatial requirements further explain the observed structure sensitivity of ammonia synthesis which operates best with particles exhibiting the (111) orientation [8,103,117,188]. Angular resolved UPS data [187] and theoretical considerations [180] support the picture of π-acceptor bonding between iron and nitrogen, requiring a strong inclination of the nitrogen molecular axis relative to the surface normal.…”

Section: Energetics Of Hydrogen and Nitrogen Chemisorptionmentioning

confidence: 89%

“…However, the chemisorbed molecular nitrogen and chemisorbed ammonia have not yet been studied using surface structural methods. These sites, having seven nearest-iron neighbors, were termed C7 sites [27,99,168], and are a regular ingredient of (111) faces; they were identified in model studies as being particularly active in ammonia synthesis [103,123,166,169]. The structural data are reported in Table 3.…”

Section: Single-crystal Structuresmentioning

confidence: 99%

“…The alternative [269] route, of a successive hydrogenation of chemisorbed molecular nitrogen, was also suggested [103] in an attempt to explain the structuresensitivity of the reaction. The alternative [269] route, of a successive hydrogenation of chemisorbed molecular nitrogen, was also suggested [103] in an attempt to explain the structuresensitivity of the reaction.…”

Section: Basic Kinetic Informationmentioning

confidence: 99%

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Ammonia Synthesis

Schlögl

2008

Handbook of Heterogeneous Catalysis

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phone +49 30 8413 4400, fax +49 30 8413 4401 2.1.5.5. The effect of the potassium promoter 2.1.6. Nitrogen chemisorption with polycrystalline substrates and at elevated pressures 2.1.6.1. Model studies 2.1.6.2. Polycrystalline substrates 2.1.7. The mechanism of ammonia synthesis 2.1.7.1. Basic kinetic information 2.1.7.2. Analytical rate equations 2.1.7.3. Microkinetic rate equations 2.1.8. Conclusion

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Section: 1 Reference Experimentssupporting

confidence: 87%

Section: Energetics Of Hydrogen and Nitrogen Chemisorptionmentioning

confidence: 89%

Section: Single-crystal Structuresmentioning

confidence: 99%

Section: Basic Kinetic Informationmentioning

confidence: 99%

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Ammonia Synthesis

Schlögl

2008

Handbook of Heterogeneous Catalysis

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“…4 TempcraturabhHngigkeit der thermodynamischen Deuteriumisotopenelfckte fur die Gleichgewichte II ( -) und IV ( ---); s. Text. A : Experimenteller Deuteriumisotopeneffekt der Ammoniaksynthese [21] der Arnrnoniaksynthese ist dernnach konsistent niit der von Brill [25] vertretenen Ansicht, daO diese Reaktion iiber adsorbierte Spezies des Typs N,H, verliiuft.…”

Section: Ergebnisseunclassified

Über Deuteriumisotopeneffekte bei der Katalyse des Hydrazinzerfalls und der Ammoniaksynthese

Schulz‐Ekloff

Appelt

Baresel

et al. 1975

Ber Bunsenges Phys Chem

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Die halalytische Zersetzung von Hydrazin und Deuterohydrazin an Platin wurde in schwelelsaurer Liisung (0.25 N ) bei 5 0 -YO C' untrr\ucht. Der Isotopeneffekt rl'lr'' betrigt 5.9 f 0,2 bei 70 C . Aus der Temperaturabhlngigkeit d r r %erlallsgeschwindigkeiteii uerden die Akii\/ierungsenergien EH = 29 kJ/mol und El' = 34 kJ/niol bestinimt. Mit der Annahme. daO die Spaltung einer N -H-Hindung die Kincl ih tlcr katalytischen Zerfallsreaktion bestinimt, wird ein maximaler kinetischer Isotopeneffekt ahgeschitrt. der mit dem expcrimcntellen Wert gut uhereinstimmt. Der 1 OII Ozaki, Taylor und Boudart gemessenc. jedoch falsch ausgewertete Deuteriumisotopeneffekt der Ammoniaksynthese bird ncu interpretiert. Als adsorhierte Spezies, die mit dem gebildeten Ainmoniak im Cileichgewicht ist. wird Hydrarin angcnoninien.The c.ilalytic decomposition of hydrarine and d e u t e r o h q d r a m e at platinum was studied in sulfuric acid solution (0.25 N ) at 50 -00 C'.The iwtope effect r"/tD is 5.9 k 0.2 at 70 C. The activation energies E" = 29 kJ/mol and ED = 34 kJ, mol Lire found from the temperature dependence of the decomposition rate. With the assumption. that the kinetics of the catalytic decomposifion arc limited hy the splitting of a n N -I-I-bond. a maximum kinetic isotopc effect was cstimaled, which was in good agreement with the experimental value. The deuterium isotope effect of the ammonia synthesis. which Ozaki. Taylor and Boudart have measured hut wrongly interpreted. u i i * l ssumed. that hydrarine is the adsorbed species which IS in equilibrium with (lie formed ammonia.

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Die Theorie des Strahlungsgleichgewichtes

Brill¹

1925

Astron Nachr

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�ber den Entwicklungsgang der Sterne

Cited by 4 publications

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Ammonia Synthesis

Ammonia Synthesis

Über Deuteriumisotopeneffekte bei der Katalyse des Hydrazinzerfalls und der Ammoniaksynthese

Die Theorie des Strahlungsgleichgewichtes

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