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Stereoselectivity in catalytic reactions: CO oxidation on Pd(100) by rotationally aligned O2 molecules (Articolo in rivista)

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Stereoselectivity in catalytic reactions: CO oxidation on Pd(100) by rotationally aligned O2 molecules (Articolo in rivista) (literal)

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Vattuone L.; Gerbi A.; Savio L.; Cappelletti D.; Pirani F.; Rocca M. (2010)
Stereoselectivity in catalytic reactions: CO oxidation on Pd(100) by rotationally aligned O2 molecules
in The European physical journal. B, Condensed matter physics (Print); Springer, New York (Stati Uniti d'America)
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In: European Physical Journal B, vol. 75 (1) pp. 81 - 87. Issue entitled \"Topical Issue on Advances in Surface Science\". EDP Sciences, Societ`a Italiana di Fisica, Springer-Verlag 2010, 2010. (literal)

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Department of Physics and CNR-IMEM, Genova, Italy, CNISM Unita' di Perugia and Dip. di Ing. Civile ed Ambientale Univ. di Perugia, Italy, CNISM Unita' di Perugia and Dipartimento di Chimica Universita' di Perugia, Italy (literal)

Titolo

Stereoselectivity in catalytic reactions: CO oxidation on Pd(100) by rotationally aligned O2 molecules (literal)

Abstract

We report on stereodynamical effects in heterogeneous catalytic reactions as measured by molecular beam-surface experiments. Specifically for CO oxidation on Pd(100) we find that the rotational alignment of the incoming O2 at low (Θ = 0.04 ML) and at intermediate (ΘCO = 0.17 ML) CO pre-coverage, causes a higher reactivity of molecules in high and in low helicity states, respectively (corresponding to helicoptering and cartwheeling motion of O2). In first approximation, at low CO precoverage the difference in reactivity is determined by the different location of the O atoms generated in the dissociation process by the different parent molecules, while at intermediate CO pre-coverage the reactivity is influenced also by the different ability of cartwheeling and helicoptering O2 to penetrate through the CO adlayer. In accord with this the total amount of CO2 produced is always largest for helicopters which generate supersurface O atoms at least in the low CO pre-coverage limit. A deeper inspection of the data indicates, however, that the dynamics is more complex, two different pathways being present for the reaction with O generated by helicopters and one for O generated by cartwheels. Moreover, cartwheels generated oxygen influences the reactivity of subsequently arriving helicopters. (literal)

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