The oxidation of carbidic monolayers on Ni(110)

Sau, Radhesyam; Hudson, John B.

doi:10.1016/0039-6028(81)90318-6

Cited by 22 publications

(6 citation statements)

References 11 publications

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“…The same result was obtained by Horgan and Dalins [34] for graphitic monolayers on Ni( 111) and by Sau and Hudson [35] for carbidic monolayers on Ni( 110). In both these cases, however, the oxidation rate was found to be linear with oxygen pressure, whereas we found a po( dependence, which indicates a reaction with dissociated (atomic) oxygen although a reaction with a molecular species is not unequivocally excluded [34].…”

Section: Discussionsupporting

confidence: 73%

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The adsorption and decomposition of carbon monoxide on Ni(100) and the oxidation of the surface carbide by oxygen

et al. 1981

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The interaction of carbon monoxide with Ni( 100) has been studied by ellipsometry and Auger electron spectroscopy.Bombardment by electrons of a relatively high energy (2500 eV) leads to the diaproportionation of the adsorbed CO (2 CO,, -C,, tCOz,). The rate of oxidation of this surface carbide is -dhc/dt=k,,h,p& exp( -E,,,/RT).where h, is the carbon 272 eV Auger peak height, uzO.5 and the apparent activation energy E,,, = 13.3 kcal/mole. This relation is valid at 20%400°C and at oxygen pressures of 5 X IO '-X x IO ' Torr.

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Section: Discussionsupporting

confidence: 73%

“…The oxidation of the carbidic surface by oxygen [34,35] has been investigated less extensively than the reaction with hydrogen [2,.…”

Section: Introductionmentioning

confidence: 99%

The adsorption and decomposition of carbon monoxide on Ni(100) and the oxidation of the surface carbide by oxygen

et al. 1981

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“…(7) is thus first order in the oxygen pressure and independent of carbon converge, which is in agreement with the experimental observations. The same reaction on Ni(llO) was also found to be first order in the oxygen pressure as reported by Sau and Hudson [6], but dependent on the carbon concentration. For Ni(lOO)/C, however, a p"' dependence was found for low carbon coverages (0, =z 0.25) [4], whereas for larger amounts of carbon a rather involved reaction scheme was necessary [5].…”

Section: The Reaction Of the Carbide Layer On Ni(ll1) With Oxygensupporting

confidence: 84%

“…Since the latter technique allows an analysis of deeper layers as well, it complements earlier work on this system using low energy electron diffraction (LEED) [1,2] or vibrational spectroscopy ]31. The reactivity of the carbide layer towards oxygen has been studied for Ni(lOO)/C [4,5] and Ni(llO)/C [6]. In the present work the same reaction for Ni(ll1) is studied and compared with the results obtained for the other two crystal faces.…”

Section: Introductionmentioning

confidence: 85%

The interaction of oxygen and carbon monoxide with a carbided Ni(111) surface

VINK¹

1984

Applied Surface Science

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The thermal decomposition of ethylene on Ni(lll) at 250°C is shown to lead to carbon deposition on and -in a later stage -below the surface. Independent of the amount of carbon below the surface, CO is adsorbed with an isosteric heat of adsorption of 105 kJ/mol. The surface carbon reacts with oxygen at 25O'C. The reaction rate is independent of the surface carbon coverage and first order in oxygen pressure. The subsurface carbon segregates to the surface after removal of the surface carbon layer.

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“…165 On the other hand, it appears to oxidize more rapidly than carbidic carbon. 333 Studies of the disproportionation of CO over iron,334 nickel,335 and cobalt335 catalysts and studies of coke formation on dehydrogenation (iron-chromium) cata-lysts336 indicate that graphite deposits can also be formed by the breakdown of an intermediate metal carbide. Although these studies were carried out at higher temperatures than typical synthesis conditions, this path should also be considered as a possibility for formation of unreactive carbon.…”

Section: Unreactive Carbonmentioning

confidence: 99%

A comprehensive mechanism for the Fischer-Tropsch synthesis

1981

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I. Introduction 447 II. Viewpoints on Chemical Mechanisms 448 III. The Mechanism 450 A. Adsorption Steps 450 1. Hydrogen Adsorption 450 2. Carbon Monoxide Adsorption 451 3. Carbon Monoxide Dissociation 451 B. Initial Reactions among Chemisorbed 454 Species 1. Reactions of C and O with H 455 2. Reactions of Undissociated CO 456 C. Reactions of Hydrocarbon and H-C-0 457 Intermediates D. Product Formation 460 1. Organic Products 460 2. Water 462 3. Carbon Dioxide 462 4. Unreactive Carbon 462 5. Metal Carbides and Oxides 463 IV. Comparison with Previously Proposed 463 Mechanisms A. Carbide Mechanism 464 B. Bureau of Mines Mechanism 464 C. Pichler-Schulz Mechanism 465 D. Mechanisms Based on Complex Chemistry 465 E. Ponec Mechanism 466 F. The Fischer-Tropsch Synthesis as a 466 Polymerization Reaction V. Extension to Other Systems 467 A. Carbon Monoxide Disproportionation 467 B. Water-Gas Shift Reaction 467 C. Methanation 468 D. Isosynthesis and Kolbel-Engelhardt 469 Synthesis E. Homogeneously Catalyzed Reactions

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The oxidation of carbidic monolayers on Ni(110)

Cited by 22 publications

References 11 publications

The adsorption and decomposition of carbon monoxide on Ni(100) and the oxidation of the surface carbide by oxygen

The adsorption and decomposition of carbon monoxide on Ni(100) and the oxidation of the surface carbide by oxygen

The interaction of oxygen and carbon monoxide with a carbided Ni(111) surface

A comprehensive mechanism for the Fischer-Tropsch synthesis

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