Translational energy of desorbing product and kinetic change at steady state in carbon monoxide oxidation on platinum(557)

Cao, Gengyu; Seimiya, Yoshiyuki; Matsushima, Toshiyasu

doi:10.1016/s1381-1169(98)00250-7

Cited by 12 publications

(9 citation statements)

References 34 publications

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“…Thus, a large difference of about 1000 K (∼4 kcal/mol) was found on the (001) site, and a lower difference of 200−400 K was noticed on the (111) site. The latter value can be fully explained by the surface temperature effect because of an about 250 K difference in the surface temperature between the two experiments . On the other hand, the former difference is too large to be explained by the temperature effect alone.…”

Section: Discussionmentioning

confidence: 86%

“…The latter value can be fully explained by the surface temperature effect because of an about 250 K difference in the surface temperature between the two experiments. 26 On the other hand, the former difference is too large to be explained by the temperature effect alone.…”

Section: Discussionmentioning

confidence: 99%

“…This decrease has already been reported on Pt(557) and Pt(133). 26,47 There must be a mechanism in which energy transfer is efficient when the surface is covered by a significant amount of CO. The collision between CO 2 and CO might yield a more efficient energy flow than that between CO 2 and Pt because of a smaller difference in the mass mismatch.…”

Section: Discussionmentioning

confidence: 99%

“…The apparatus has been described in detail elsewhere . It consists of three chambers, which are evacuated by individual pumping systems.…”

Section: Methodsmentioning

confidence: 99%

“…A top view and a The apparatus has been described in detail elsewhere. 26 It consists of three chambers, which are evacuated by individual pumping systems. The reaction chamber has RV-LEED (reverseview low-energy electron diffraction) and XPS (X-ray photoelectron spectroscopy) optics, a QMS (quadrupole mass spectrometer), an Ar + gun, a sample manipulator, and a gas handling system.…”

Section: Introductionmentioning

confidence: 99%

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Dynamics on Individual Reaction Sites in Steady-State Carbon Monoxide Oxidation on Stepped Platinum(113)

et al. 1999

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The reaction kinetics and dynamics of carbon monoxide oxidation on a stepped Pt(113) = (s)2(111) × (001) surface were studied by angle-resolved kinetic and velocity measurements at the steady state. CO2 desorption sharply collimated nearly along either the (111) site normal or the (001) site normal. Only two reaction sites, the (111) and (001) sites, were operative. The translational energy of CO2 was characteristic of each site throughout a site switching. At surface temperatures above 520 K in the active region, where the reaction was first order in CO, the preference of the (111) site was suppressed with increasing CO pressure. Below 520 K, on the other hand, site switching slowly took place under limited conditions, in which both sites considerably contributed to the reaction and a meta-stable adsorbed phase seemed to be formed. The preference for the (111) site over the (001) site was caused by the former's higher reactivity of oxygen.

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Section: Discussionmentioning

confidence: 86%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…The apparatus has been described in detail elsewhere . It consists of three chambers, which are evacuated by individual pumping systems.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%