The adsorption of CO on Cu(110)

Horn, Karsten; Hussain, M. Sakhawat; Pritchard, J.

doi:10.1016/0039-6028(77)90341-7

Cited by 162 publications

(27 citation statements)

References 13 publications

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“…It is probable that the majority of the surface is Cu(111). We had previously shown that the heat of adsorption of CO on the unsupported polycrystalline Cu was 50 kJ mol -1 , a value which is identical to that found for CO adsorption of Cu(111) [16,18]. The surface giving rise to the higher Cu-O bond is probably Cu(110).…”

Section: Off-line Characterisation Of the Catalystsupporting

confidence: 69%

Postulate of a Mechanism for Temperature Programmed Reaction Spectroscopy (TPRS) Which Accounts for the Coincident Evolution of H2 and CO2 in the TPRS of Succinates and Formates Adsorbed on Cu: Description of a Novel Method for the Identification of the Surface Morphology of Cu on Supported Cu Catalysts

Waugh

2015

Catal Lett

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The combination of temperature programmed reaction spectroscopy, temperature programmed oxidation (TPO) and N 2 O reactive frontal chromatography (N 2 O-RFC) has shown that the adsorbate produced by dosing dimethylsuccinate on to a Cu/Al 2 O 3 catalyst is a succinate species with 8 out of 10 surface Cu atoms having a succinate species adsorbed on them. The succinate species are bonded end-on and unidentate to the Cu atoms. This configuration constitutes a self-assembled monolayer. Temperature programming causes vicinal strands of the adsorbed succinate to interact, resulting in simultaneous dehydrogenation and decarboxylation, producing coincident evolution of H 2 and CO 2 in peaks at 668 and 793 K and leaving the C of the succinate chain on the Cu surface This C is removed by TPO, producing CO 2 at a peak maximum temperature of 593 K. Prior to the oxidation of the C to CO 2 , TPO oxidises the Cu metal to CuO in the temperature range 323-493 K. Reduction of this CuO produces Cu metal whose metal surface area as measured by N 2 O-RFC is 9.8 m 2 g -1 , a value which is identical to that of the fresh Cu/Al 2 O 3 catalyst. Therefore oxidation of the Cu metal to bulk CuO and re-reduction does not cause sintering of the Cu. However, the surface morphology of the Cu metal produced by reduction of the CuO has changed as evidenced by temperature programmed reduction (TPR)

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Section: Off-line Characterisation Of the Catalystsupporting

confidence: 69%

Postulate of a Mechanism for Temperature Programmed Reaction Spectroscopy (TPRS) Which Accounts for the Coincident Evolution of H2 and CO2 in the TPRS of Succinates and Formates Adsorbed on Cu: Description of a Novel Method for the Identification of the Surface Morphology of Cu on Supported Cu Catalysts

Waugh

2015

Catal Lett

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“…The position and stability of this band strongly indicates that it is mainly due to the carbonyls of Cu + ions or of small clusters of zerovalent copper. It is in fact well known that carbonyls on clean massive Cu metal are very weakly adsorbed and usually responsible for absorptions below 2100-2070 cm −1 [34][35][36][37]. It cannot be excluded that such species exist at the lowest temperatures and are responsible for the tail at lower frequency of this band.…”

Section: Ir Study Of Low Temperature Co Adsorptionmentioning

confidence: 96%

An IR study of methanol steam reforming over ex-hydrotalcite Cu–Zn–Al catalysts

Vargas

Busca

Costantino

et al. 2007

Journal of Molecular Catalysis A: Chemical

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“…An exact value is not known, but in ref. [24] it is reported that it is intermediate between the value for Cu(ll1) (lo-12 kcallmol [36,37]) and that for Cu( 110) (13.1 kcal/mol [38]). Thus the activation energy for the reaction CO,d + C&j --f CO?…”

Section: Initial Oxygen Coverage <05 Monolayermentioning

confidence: 99%

The adsorption and incorporation of oxygen on Cu(100) and its reaction with carbon monoxide; comparison with Cu(111) and Cu(110)

1980

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Ellipsometry, LEED, Auger electron spectroscopy and monitoring of work function changes have been used to study the interactions of 02 and N20 with a clean annealed Cu(100) surface and of the reaction of CO with sorbed oxygen. Gas pressures were in the range IO-'--lo4 Torr and crystal temperatures varied between 25-4OO'C. The initial interaction of oxygen with Cu(100) occurs in three stages. Oxygen chemisorbs with an initial sticking coefficient of -10T2 at room temperature and an apparent activation energy of 1.3-3.5 kcal/mol, depending on the substrate temperature. The first stage is the formation of a (42 X J2)R4S0 LEED pattern up to a coverage of 0.5, which is converted with an apparent activation energy of 3.2 kcal/mol to a (,/2 X 242}R45' structure at a coverage of 0.75 in the second stage. The work function increases inthe ftrst stage in an amount of -300 meV, but decreases in the second stage to the value of the clean surface. In a third stage after an induction period further oxygen uptake could be registered only with ellipsometry. The apparent activation energy is 4.5 kcal/mol. The initial decomposition probability of N20 at room temperature is 5 X 10m5, its apparent activation energy 3.2 kcal/mol. The LEED patterns observed were the same as with 02. The sorbed oxygen can be removed at all coverages with CO. The reaction appears to follow LangmuirHinshelwood kinetics with an activation energy for the reaction Goad + oad + CO2 of lP-20 kcal/mol. A comparison is made with the data obtained for Cu(ll1) and Cu(ll0).

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The adsorption of CO on Cu(110)

Cited by 162 publications

References 13 publications

An IR study of methanol steam reforming over ex-hydrotalcite Cu–Zn–Al catalysts

The adsorption and incorporation of oxygen on Cu(100) and its reaction with carbon monoxide; comparison with Cu(111) and Cu(110)

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