The influence of strongly reducing conditions on strong metal–support interactions in Cu/ZnO catalysts used for methanol synthesis

d’Alnoncourt, Raoul Naumann; Xia, Xinyu; Strunk, Jennifer; Löffler, Elke; Hinrichsen, Olaf; Mühler, Martin

doi:10.1039/b515487a

Cited by 134 publications

(106 citation statements)

References 41 publications

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“…In spite of these complications, good accordance has been generally detected between the spectra of CO adsorbed on single crystal Cu surfaces on the one hand and nanostructured copper particles supported on oxides on the other hand, [10,[14][15][16][17][18]36] resulting in the general agreement that peaks >2100 cm −1 are ascribed to CO adsorption on oxidized copper species Cu n+ , while peaks <2100 cm −1 are due to CO adsorption on metallic copper.…”

Section: Discussionsupporting

confidence: 54%

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IR-Spectroscopic Study on the Interface of Cu-Based Methanol Synthesis Catalysts: Evidence for the Formation of a ZnO Overlayer

et al. 2017

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Section: Discussionsupporting

confidence: 54%

“…Frequently, FTIR studies have been performed on model catalysts with lower copper contents or after dilution [13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

IR-Spectroscopic Study on the Interface of Cu-Based Methanol Synthesis Catalysts: Evidence for the Formation of a ZnO Overlayer

et al. 2017

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“…Note that encapsulation-derived structures have often been considered as active phases in methanol synthesis (see, for example, refs. [17][18][19]). Therefore, planar ZnO films supported on Cu and Ag could be well suited for understanding the role of ZnO in those catalysts.…”

Section: Introductionmentioning

confidence: 99%

Reactivity of Ultra-Thin ZnO Films Supported by Ag(111) and Cu(111): A Comparison to ZnO/Pt(111)

et al. 2014

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Abstract.We studied structure and reactivity of ZnO(0001) ultrathin films grown on Ag (111) and Cu(111) single crystal surfaces. Structural characterization was carried out by scanning tunneling microscopy, Auger electron spectroscopy, low-energy electron diffraction, and temperature programmed desorption. The CO oxidation behavior of the films was studied at low temperature (450 K) at near atmospheric pressures using gas chromatography. For ZnO/Cu(111), it is shown that under reaction conditions ZnO readily migrates into the Cu crystal bulk, and the reactivity is governed by a CuO x oxide film formed in the reaction ambient. In contrast, the planar structure of ZnO films on Ag(111) is maintained, similarly to the previously studied ZnO films on Pt(111). At sub-monolayer coverages, the "inverse" model catalysts are represented by two-monolayer-thick ZnO(0001) islands on Pt(111) and Ag(111) supports. While the CO oxidation rate is considerably increased on ZnO/Pt(111), which is attributed to active sites at the metal/oxide boundary, sub-monolayer ZnO films on Ag(111) did not show such an effect, and the reactivity was inhibited with increasing film coverage. The results are explained by much stronger adsorption of CO on Pt(111) as compared with Ag(111) in proximity to O species at the oxide/metal boundary. In addition, the water-gas shift and reverse water-gas shift reactions were examined on ZnO/Ag(111), which revealed no promotional effect of ZnO on the reactivity of Ag under the conditions studied. The latter finding suggests that wetting phenomena of ZnO on metals does not play a crucial role in the catalytic performance of ZnObased real catalysts in those reactions.

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“…For example, the formation of a graphitic ZnO x species was suggested and experimentally observed in the vicinity of nano-particles. 16,17 It is thus not clear to what degree ultra-thin metal-supported ZnO films resemble the surfaces of ZnO or whether they exhibit significantly different properties.…”

mentioning

confidence: 99%

Influence of hydrogen on the structure and stability of ultra-thin ZnO on metal substrates

Bieniek

Hofmann

Rinke

2015

Applied Physics Letters

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We investigate the atomic and electronic structure of ultra-thin ZnO films (1 to 4 layers) on the (111) surfaces of Ag, Cu, Pd, Pt, Ni, and Rh by means of density-functional theory. The ZnO monolayer is found to adopt an α-BN structure on the metal substrates with coincidence structures in good agreement with experiment. Thicker ZnO layers change into a wurtzite structure. The films exhibit a strong corrugation, which can be smoothed by hydrogen (H) adsorption. An H over-layer with 50% coverage is formed at chemical potentials that range from low to ultra-high vacuum H2 pressures. For the Ag substrate, both α-BN and wurtzite ZnO films are accessible in this pressure range, while for Cu, Pd, Pt, Rh, and Ni wurtzite films are favored. The surface structure and the density of states of these H passivated ZnO thin films agree well with those of the bulk ZnO(0001¯)-2×1-H surface.

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The influence of strongly reducing conditions on strong metal–support interactions in Cu/ZnO catalysts used for methanol synthesis

Cited by 134 publications

References 41 publications

IR-Spectroscopic Study on the Interface of Cu-Based Methanol Synthesis Catalysts: Evidence for the Formation of a ZnO Overlayer

IR-Spectroscopic Study on the Interface of Cu-Based Methanol Synthesis Catalysts: Evidence for the Formation of a ZnO Overlayer

Reactivity of Ultra-Thin ZnO Films Supported by Ag(111) and Cu(111): A Comparison to ZnO/Pt(111)

Influence of hydrogen on the structure and stability of ultra-thin ZnO on metal substrates

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