A reactive oxygen adlayer on Cu(110) at 100 K

Sasaki, Takehiko; Sueyoshi, Tsuyoshi; Iwasawa, Yasuhiro

doi:10.1016/0039-6028(94)91209-2

Cited by 33 publications

(21 citation statements)

References 45 publications

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“…The oxygen species involved in these reactions could be atomic or molecular; in principle, we do not have direct evidence of their nature. However, the spectroscopic features of CO−O 2 interactions, as for the CO stretching region frequencies, are very similar to those reported by Hollins and Pritchard on oxidized Cu(110), and much experimental evidence, coming from different surface science techniques, indicates that on the Cu(110) surface, oxygen chemisorption is dissociative also at T < 300 K. Therefore, also in our case, atomic oxygen, adsorbed on copper particles, can be presumed. Moreover, it was found, on Cu(110), by HREELS, LEED, and TPD 40 that the exposure to oxygen at 100 K produces a very reactive oxygen species that oxidizes CO to CO 2 , desorbing below 200 K; moreover, on the same surface, a (2 × 1) phase was also detected that can oxidize CO only at temperatures higher than 430 K. The more reactive oxygen species, O - like, was associated with isolated oxygen atoms; the less reactive one, O 2- like, was associated with reconstructed Cu−O−Cu planes.…”

Section: Resultssupporting

confidence: 89%

FTIR Study of Carbon Monoxide Oxidation and Scrambling at Room Temperature over Copper Supported on ZnO and TiO₂. 1

1996

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An FTIR and quadrupole mass spectroscopic study of CO adsorption and oxidation with 16O2 and 18O2 on copper supported on ZnO and TiO2 is presented. The experimental results indicate that CO is adsorbed on the metallic particles dispersed on both oxides on two kinds of sites, on the normal terrace sites and on sites at the borderline of the particles. Moreover, on titania, a band at 2126 cm-1, assigned to CO adsorbed on isolated Cu atoms and/or on two-dimensional small clusters, is detected. A frequency shift of the bands of CO adsorbed on the metallic particles observed in the CO−O2 coadsorption experiments and the occurrence of a scrambling reaction between CO and 18O2 reveal that on all these samples, there are metallic sites which are able to adsorb at the same time oxygen atoms and carbon monoxide. Carbon dioxide and carbonate-like species are formed: the asymmetric stretching frequencies of CO2 and the quadrupole mass spectroscopic analysis reveal that with 18O2, different isotopic molecular CO2's are formed, while the carbonate-like species have the same frequencies of those produced in 16O2. Moreover, these species are completely lacking in the absence of oxygen in the gas phase. The experimental results indicate that there are, on these samples, two independent pathways for the CO oxidation, a direct oxidation of CO at the surface of the metallic particles and an induced oxidation with the surface lattice oxygen species of the supports.

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Section: Resultssupporting

confidence: 89%

FTIR Study of Carbon Monoxide Oxidation and Scrambling at Room Temperature over Copper Supported on ZnO and TiO₂. 1

1996

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“…23,34 -36 Recently, Sasaki et al, by the use of EELS, LEED, and TPD, have reported that the oxygen-as-exposed surface at 100 K is much more reactive for CO oxidation, compared to the Cu͑110͒͑2ϫ1͒-O surface. 40 The postannealing treatment of oxygen-as-exposed surface at 100 K greatly influences the CO oxidation reaction, and once the Cu͑110͒͑2ϫ1͒-O surface is formed, CO oxidation is almost completely suppressed. We consider that such mobile disordered oxygen atoms also play an important role in the CO oxidation on Cu͑110͒.…”

Section: B Reaction Mechanism Of Co Oxidation On Pt(111)mentioning

confidence: 99%

Thermal excitation of oxygen species as a trigger for the CO oxidation on Pt(111)

Yoshinobu

Kawai

1995

The Journal of Chemical Physics

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Thermal excitation of adsorbed oxygen species is found to initiate the CO oxidation on Pt͑111͒. We have prepared three different coadsorption systems to study the reactivity of different oxygen species; ͑1͒ CO on the O 2 preadsorbed Pt͑111͒ surface, ͑2͒ CO on the nearly perfect Pt͑111͒ p(2ϫ2)-O surface, and ͑3͒ CO on the disordered atomic oxygen-preadsorbed Pt͑111͒ surface. Four CO 2 desorption peaks ͑␣-CO 2 at 125 K, ␤ 3 -CO 2 at ϳ225 K, ␤ 2 -CO 2 at ϳ260 K, and ␤ 1 -CO 2 at 320 K͒ are observed. The desorption temperatures of CO 2 strongly depend on the adsorbed states of oxygen species. We have shown that the ␣-CO 2 state, ␤ 2,3 -CO 2 states, and ␤ 1 -CO 2 state are correlated with adsorbed O 2 , disordered oxygen atoms, and p͑2ϫ2͒ oxygen atoms, respectively. The difference in CO 2 desorption temperature is related to thermal excitation of each oxygen species, which is derived from the structural information of coadsorbed states during thermal evolution by means of low-energy electron diffraction and infrared reflection absorption spectroscopy.

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“…CO oxidation was reported to carry out on copper films at 473-623 K with a small activation energy barrier. 1 Up to now, experimental and theoretical studies had been performed for diverse copper surfaces and clusters such as Cu(100), [8][9][10] Cu(110), 8,[10][11][12][13][14][15][16][17][18] Cu(111), 8,10,14,19 Cu(311), 11,12 pyramidal Cu 55 cluster, 21 and copper nanocluster. 22,23 By synthesizing highly dispersed Au-Cu alloy nanoparticles, Mou's group demonstrated that the gold-copper bimetallic catalysts had superior performance to monometallic gold and copper catalysts, exhibiting the synergy between gold and copper.…”

Section: Introductionmentioning

confidence: 99%

Theoretical investigation on CO oxidation catalyzed by a copper nanocluster

Tang

Zhang

2013

RSC Adv.

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A reactive oxygen adlayer on Cu(110) at 100 K

Cited by 33 publications

References 45 publications

FTIR Study of Carbon Monoxide Oxidation and Scrambling at Room Temperature over Copper Supported on ZnO and TiO₂. 1

FTIR Study of Carbon Monoxide Oxidation and Scrambling at Room Temperature over Copper Supported on ZnO and TiO₂. 1

Thermal excitation of oxygen species as a trigger for the CO oxidation on Pt(111)

Theoretical investigation on CO oxidation catalyzed by a copper nanocluster

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A reactive oxygen adlayer on Cu(110) at 100 K

Cited by 33 publications

References 45 publications

FTIR Study of Carbon Monoxide Oxidation and Scrambling at Room Temperature over Copper Supported on ZnO and TiO2. 1

FTIR Study of Carbon Monoxide Oxidation and Scrambling at Room Temperature over Copper Supported on ZnO and TiO2. 1

Thermal excitation of oxygen species as a trigger for the CO oxidation on Pt(111)

Theoretical investigation on CO oxidation catalyzed by a copper nanocluster

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FTIR Study of Carbon Monoxide Oxidation and Scrambling at Room Temperature over Copper Supported on ZnO and TiO₂. 1

FTIR Study of Carbon Monoxide Oxidation and Scrambling at Room Temperature over Copper Supported on ZnO and TiO₂. 1