Heats of adsorption of hydrogen on polycrystalline iron films

Wedler, G.; Geuss, K.-P.; Colb, K.G.; McElhiney, G.

doi:10.1016/0378-5963(78)90025-9

Cited by 49 publications

(9 citation statements)

References 15 publications

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“…The data for the enthalpy of chemisorption of hydrogen on iron single crystals, as well as on technical catalysts and polycrystalline surfaces, agree rather well in the range between 85 and 105 kJ mol −1 [53,72,73].…”

Section: Hydrogenmentioning

confidence: 66%

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: Hydrogenmentioning

confidence: 66%

Ammonia Synthesis

Schlögl

2008

Handbook of Heterogeneous Catalysis

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“…For H/Fe(1 00) -86 kJ/mole was found by temperature programmed desorption [383]; for H/Fe(11 0) -109 kJ/mole [378] by temperature programmed desorption or -24.2 kcaljmole [384] by He-scattering; for HjFe(111) -88 kJ/mole by temperature programmed desorption [378]. For D/Fe(110) -24.2 kcaljmole has been determined from He-scattering [384] and for D/Fe(111) -104 kJ/mole by calorimetry [385].…”

Section: Thermodynamicsmentioning

confidence: 99%

“…For hydrogen adsorption on polycrystalline Fe, the enthalpy of chemisorption has been determined as -98 kJ/mole by calorimetry [385], -96 kJ/mole by calorimetry [386], -81.0 kJ/mole by electrical conductivity [387], -85.0 kJ/mole by volumetric chemisorption [388], -36 kcaljmole at zero coverage by volumetric chemisorption [389], -15 kcaljmole at 90% saturation [389], -20 kcaljmole at 140 K, zero coverage [390], -17.5 kcaljmole at 1 % of saturation calculated from the equilibrium pressure [391], and -5 kcaljmole at 10% of saturation calculated from the equilibrium pressure [391].…”

Section: Thermodynamicsmentioning

confidence: 99%

Structure and Surface Chemistry of Industrial Ammonia Synthesis Catalysts

Stoltze

1995

Ammonia

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“…However, beginning from 1972, the values almost independent of the surface coverage were repeatedly obtained under ultravacuum for middle coverages of the Fe surface. 63,64,98 The level of the constant MHC varies by about only (5% from work to work.…”

Section: Available Data On Mhcs: Whether They Confirm the Notion On S...mentioning

confidence: 99%

“Paradox of Heterogeneous Catalysis”: Paradox or Regularity?

Ostrovskii

2004

Ind. Eng. Chem. Res.

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The paradox of heterogeneous catalysis" reflects an opinion that no data file on stationary rates of a heterogeneous catalytic reaction can clarify whether the surface heterogeneity is of principal importance for the catalysis and that the surface heterogeneity is an open question. On the other hand, followers of notions on the principal importance of surface heterogeneity consider the power-law kinetic equations for catalytic processes and also logarithmic isotherms and exponential rate-coverage dependences for middle-coverage chemisorption equilibriums and rates respectively as the manifestations and proofs of surface heterogeneity. In this paper, it is shown that the available power-law kinetic equations and the relations translated by the logarithmic isotherms and exponential rate-coverage dependences can be deduced on the basis of the notion on surface uniformity. In addition, about 40 available metal-gas systems demonstrating the constancy of the molar heats of chemisorption over wide ranges of coverages are listed, and the temporal tendency of the measured molar heats of chemisorption to approach to constant levels, as the techniques and procedures are improved, is demonstrated. It is concluded that no surface heterogeneity reveals itself in catalysis and chemisorption at metals and the paradox arose from algebraic peculiarities.

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Heats of adsorption of hydrogen on polycrystalline iron films

Cited by 49 publications

References 15 publications

Ammonia Synthesis

Ammonia Synthesis

Structure and Surface Chemistry of Industrial Ammonia Synthesis Catalysts

“Paradox of Heterogeneous Catalysis”: Paradox or Regularity?

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