Part II.—“Heterogeneous reactions”. Chemical reactions on surfaces

Langmuir, Irving

doi:10.1039/tf9221700607

Cited by 195 publications

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“…A possible strategy to overcome this problem had been suggested by Irving Langmuir (Nobel Prize 1932) already many years ago: [11] "Most finely divided catalysts must have structures of great complexity. In order to simplify our theoretical consideration of reactions at surfaces, let us confine our attention to reactions on plane surfaces.…”

Section: The Surface Science Approach To Heterogeneousmentioning

confidence: 99%

Reactions at Surfaces: From Atoms to Complexity (Nobel Lecture)

2008

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Section: The Surface Science Approach To Heterogeneousmentioning

confidence: 99%

Reactions at Surfaces: From Atoms to Complexity (Nobel Lecture)

2008

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“…Langmuir recognized this and wrote an alternate expression" for the fraction of the surface covered applicable for a varying energy of adsorption (15,16):…”

Section: Afads _< 0 and K1 = Exp[-af/rt]mentioning

confidence: 99%

High Pressure Oxidation of Metals—Tungsten in Oxygen

Baur¹,

Bridges²,

Fassell³

1956

J. Electrochem. Soc.

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Tungsten rod and sheet were found to oxidize linearly in oxygen from 600 ~ to 850~ at oxygen pressures ranging from 20 to 500 psia. Oxidation rate increased with increased oxygen pressure at temperatures 750~176Theoretical considerations indicate that an equilibrium adsorption process occurs prior to the rate-determining step. The assumption of a linear change of adsorption energy with increase of surface coverage Mlowed observed oxidation rates to be corrected for pressure effect. The activation energy was 48 kcal. Tungsten sheet volatilization losses were appreciable above 800~ Only tungsten rod data were free from volatilization losses at 850~ Photographs are included showing the effect of shearing samples at room temperature prior to oxidation on the final physical appearance of the oxide. Cold shearing produces exfoliated tungsten oxide.

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“…17,18 The activation energy of this reaction strongly depends on the oxygen and carbon monoxide coverages: under CO rich conditions, the surface is poisoned as oxygen cannot adsorb and dissociate, which is required for the reaction to occur. [19][20][21] Interesting effects like an oscillatory behaviour 22 of this reaction have been reported to take place under UHV conditions 23,24 and also at ambient pressures.…”

Section: Introductionmentioning

confidence: 99%

CO oxidation on Pt(111) at near ambient pressures

Calderón

Grabau

Óvári³

et al. 2016

The Journal of Chemical Physics

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Kinetics of the CO oxidation reaction on Pt(111) studied by in situ high-resolution x-ray photoelectron spectroscopy J. Chem. Phys. 120, 7113 (2004) The oxidation of CO on Pt(111) was investigated simultaneously by near ambient pressure X-ray photoelectron spectroscopy and online gas analysis. Different CO:O 2 reaction mixtures at total pressures of up to 1 mbar were used in continuous flow mode to obtain an understanding of the surface chemistry. By temperature-programmed and by isothermal measurements, the onset temperature of the reaction was determined for the different reactant mixtures. Highest turnover frequencies were found for the stoichiometric mixture. At elevated temperatures, the reaction becomes diffusionlimited in both temperature-programmed and isothermal measurements. In the highly active regime, no adsorbates were detected on the surface; it is therefore concluded that the catalyst surface is in a metallic state, within the detection limits of the experiment, under the applied conditions. Minor bulk impurities such as silicon were observed to influence the reaction up to total inhibition by formation of non-platinum oxides. C 2016 AIP Publishing LLC.[http://dx

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Part II.—“Heterogeneous reactions”. Chemical reactions on surfaces

Cited by 195 publications

References 0 publications

Reactions at Surfaces: From Atoms to Complexity (Nobel Lecture)

Reactions at Surfaces: From Atoms to Complexity (Nobel Lecture)

High Pressure Oxidation of Metals—Tungsten in Oxygen

CO oxidation on Pt(111) at near ambient pressures

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