Methanol adsorption on SnO2 thin films with different morphologies

Kawabe, Taketoshi; Tabata, Kenji; Suzuki, Eiji; Nagasawa, Y.

doi:10.1016/s0039-6028(01)00848-2

Cited by 8 publications

(4 citation statements)

References 13 publications

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“…44 SnO 2 films in the (110) phase also demonstrate higher activity for methanol dissociation and oxidation in comparison with films comprising (211) and (301) phases. 45 Taken together with our findings on planar and faceted O-modified Re, all these studies demonstrate that changes in local geometric structure can significantly affect the activity of model oxidation catalysts toward methanol reaction.…”

Section: Discussionsupporting

confidence: 78%

“…The reduced activity of the faceted surface may be due, in part, to the introduction of nanometer scale facets of more closely packed (112̄1) and (011̄0) facet planes, compared to the open coordination of the planar O-covered Re(123̄1) surface. Differences in methanol reactivity have also been observed over TiO 2 , CeO 2 , ZnO, and SnO 2 thin films and single crystals with different morphologies and crystallographic orientations. Rutile TiO 2 (001) exposing {114} facets is more active toward methanol oxidation than the {011}-faceted (001) surface, and rutile TiO 2 powders also exhibit higher methanol adsorption activity than the anatase polymorph .…”

Section: Discussionmentioning

confidence: 87%

“…Likewise, ZnO in the (0001̄)-O polar face is inactive toward methanol, while both dehydrogenation and oxidation reactions occur on the (0001)-Zn polar face . SnO 2 films in the (110) phase also demonstrate higher activity for methanol dissociation and oxidation in comparison with films comprising (211) and (301) phases …”

Section: Discussionmentioning

confidence: 99%

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Methanol Reactions over Oxygen-Modified Re Surfaces: Influence of Surface Structure and Oxidation

et al. 2004

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The reactions of methanol over planar and faceted oxygen-covered Re(123̄1), and over a thin-film oxide on Re(123̄1), are studied using temperature-programmed desorption (TPD), high-resolution X-ray photoelectron spectroscopy (HRXPS), and low-energy electron diffraction (LEED). These surfaces are potential model catalysts for the selective oxidation of methanol to methylal [dimethoxymethane, CH2(CH3O)2]. Re(123̄1) is chosen because it is a morphologically unstable substrate that develops nanometer scale facets when precovered with oxygen and annealed, thus providing a suitable surface to investigate structure−reactivity relationships in methanol decomposition. Reaction pathways for methanol over the O-covered planar and faceted surfaces are qualitatively similar, proceeding through competing pathways of dehydrogenation to CH2O and CO and nonselective decomposition to yield H2 and CO that is formed by recombination of C(ads) with surface-bound oxygen. The selectivity toward methanol dehydrogenation products is not affected by morphological differences between the planar and faceted surfaces. However, the activity of the O-modified surfaces decreases progressively in the following order: planar O/Re > faceted O/Re > thin-film oxide/Re, with the thin-film oxide relatively inactive toward methanol reaction. The differences in activity may be attributed to changes in local geometric structure, the oxidation state, and the local order of Re−O species formed on the O-modified Re surfaces. We discuss these results in the context of the elementary steps in the catalytic oxidation of methanol to methylal.

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Section: Discussionsupporting

confidence: 78%

Section: Discussionmentioning

confidence: 87%

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Methanol Reactions over Oxygen-Modified Re Surfaces: Influence of Surface Structure and Oxidation

et al. 2004

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“…Because of unique conductance, SnO 2 has been used as a catalyst for oxidation of various kinds of hydrocarbons [14]. Preliminary studies indicate that the presence of tin oxides in Pt/SnO 2 catalyst leads to higher current densities for the electrooxidation of methanol [6] and ethanol [15] in comparison with the case of a pure platinum catalyst.…”

Section: Introductionmentioning

confidence: 99%