The adsorption of methanol on Pt(111), an IR reflection and UV photoemission study

Ehlers, D.; Spitzer, A.; Lüth, H.

doi:10.1016/0039-6028(85)91026-x

Cited by 76 publications

(62 citation statements)

References 22 publications

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“…This desorption temperature is in good agreement with observations of the adsorption of multilayer CH 3 OH on Ru͕001͖ where the physisorbed multilayer desorbed by 190 K. 25 The splitting of bands, observed when a CH 3 OH overlayer adsorbed at 97 K is annealed, can be attributed to the formation of crystalline CH 3 OH on the HOPG surface. The same effect has been observed for multilayers of CH 3 OH adsorbed on Ru͕001͖, 25 polycrystalline Pt, 32 Pt͕111͖, 34 Rh͕100͖, 28 Pd͕100͖, 22 Pd͕110͖, 15 and Cu͕110͖. 35 Crystalline CH 3 OH exists in hydrogen bonded chains in two distinct phases: the ␣ and ␤ phases.…”

Section: A Rairs Experimentssupporting

confidence: 56%

“…15 In addition to the crystalline multilayer, a ''sandwich'' layer was also identified on Pd͕110͖ 15 which had a different RAIR spectrum to both the multilayer and the chemisorbed monolayer. The formation of crystalline multilayers has also been observed for CH 3 OH adsorbed on Ru͕001͖, 25 polycrystalline Pt, 32 Pt͕111͖, 34 Rh͕100͖, 28 Pd͕100͖, 22 and Cu͕110͖. 35 In all cases, formation of the crystalline phase was temperature dependant and could only be observed following a certain minimum exposure of CH 3 OH.…”

Section: Introductionmentioning

confidence: 77%

“…This is in good agreement with previous observations which showed that a minimum exposure was required before the formation of crystalline CH 3 OH could be observed. 22,25,28,32,34,35 Since the observation of the formation of crystalline CH 3 OH was also temperature dependent, additional adsorp- tion experiments were performed with the surface held at 130 K. RAIR spectra were recorded as a function of increasing CH 3 OH exposure. Initial adsorption of CH 3 OH at lower exposures (Ͻ50 L) led to essentially identical spectra to those recorded following adsorption at 97 K ͑Fig.…”

Section: A Rairs Experimentsmentioning

confidence: 99%

“…Electronic mail: w.a.brown@ucl.ac.uk talline multilayer was characterized by the observation of splitting in the O-H region of the infrared spectrum, with bands being observed at 3301 and 3193 cm Ϫ1 . 15,34 TPD studies of the desorption of CH 3 OH from a range of metal surfaces have also been performed. Pratt and co-workers 15 observed two main peaks in the TPD spectrum for CH 3 OH adsorbed on Pd͕110͖ at 143 and 230 K. The lower temperature peak did not saturate and was assigned to physisorbed CH 3 OH, while the higher temperature peak was assigned to the desorption of chemisorbed CH 3 OH.…”

Section: Introductionmentioning

confidence: 99%

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Reflection absorption infrared spectroscopy and temperature programmed desorption investigations of the interaction of methanol with a graphite surface

Bolina

Wolff

Brown

2005

The Journal of Chemical Physics

129

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Reflection absorption infrared spectroscopy and temperature programmed desorption investigations of the interaction of methanol with a graphite surface Copyright and reuse:Sussex Research Online is a digital repository of the research output of the University.Copyright and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable, the material made available in SRO has been checked for eligibility before being made available.Copies of full text items generally can be reproduced, displayed or performed and given to third parties in any format or medium for personal research or study, educational, or not-for-profit purposes without prior permission or charge, provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. Reflection absorption infrared spectroscopy ͑RAIRS͒ and temperature programmed desorption ͑TPD͒ have been used to investigate the adsorption of methanol (CH 3 OH) on the highly oriented pyrolytic graphite ͑HOPG͒ surface. RAIRS shows that CH 3 OH is physisorbed at all exposures and that crystalline CH 3 OH can be formed, provided that the surface temperature and coverage are high enough. It is not possible to distinguish CH 3 OH that is closely associated with the HOPG surface from CH 3 OH adsorbed in multilayers using RAIRS. In contrast, TPD data show three peaks for the desorption of CH 3 OH. Initial adsorption leads to the observation of a peak assigned to the desorption of a monolayer. Subsequent adsorption leads to the formation of multilayers on the surface and two TPD peaks are observed which can be assigned to the desorption of multilayer CH 3 OH. The first of these shows a fractional order desorption, assigned to the presence of hydrogen bonding in the overlayer. The higher temperature multilayer desorption peak is only observed following very high exposures of CH 3 OH to the surface and can be assigned to the desorption of crystalline CH 3 OH.

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Section: A Rairs Experimentssupporting

confidence: 56%

Section: Introductionmentioning

confidence: 77%

Section: A Rairs Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reflection absorption infrared spectroscopy and temperature programmed desorption investigations of the interaction of methanol with a graphite surface

Bolina

Wolff

Brown

2005

The Journal of Chemical Physics

129

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“…9,18,[34][35][36] In this article, two kinds of configuration of methanol are calculated, and the two configurations are similar with each other but only with the methyl rotated such that a single carbonic hydrogen points toward the surface in the second one. The first one is chosen for the decomposition of methanol in this article (Fig.…”

Section: Methanolmentioning

confidence: 99%

Reaction mechanism of methanol decomposition on Pt‐based model catalysts: A theoretical study

Niu¹,

Jiao²,

Xing³

et al. 2010

J Comput Chem

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The decomposition mechanisms of methanol on five different Pt surfaces, the flat surface of Pt(111), Pt-defect, Pt-step, Pt(110)(1 x 1), and Pt(110)(2 x 1), have been studied with the DFT-GGA method using the repeated slab model. The adsorption energies under the most stable configuration of the possible species and the activation energy barriers of the possible elementary reactions involved are obtained in this work. Through systematic calculations for the reaction mechanism of methanol decomposition on these surfaces, we found that such a reaction shows the same reaction mechanism on these Pt-based model catalysts, that is, the final products are all H (H(ads)) and CO (CO(ads)) via O-H bond breaking in methanol and C-H bond scission in methoxy. These results are in general agreement with the previous experimental observations.

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First‐Principles Simulation of the Active Sites and Reaction Environment in Electrocatalysis

Janik

Wasileski

Taylor

et al. 2008

Fuel Cell Catalysis

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The adsorption of methanol on Pt(111), an IR reflection and UV photoemission study

Cited by 76 publications

References 22 publications

Reflection absorption infrared spectroscopy and temperature programmed desorption investigations of the interaction of methanol with a graphite surface

Reflection absorption infrared spectroscopy and temperature programmed desorption investigations of the interaction of methanol with a graphite surface

Reaction mechanism of methanol decomposition on Pt‐based model catalysts: A theoretical study

First‐Principles Simulation of the Active Sites and Reaction Environment in Electrocatalysis

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