Interaction of methanol with lanthanum oxide surfaces and LaOx/Cu(111) interfaces. Part I. Adsorption and thermal decomposition

Literature Information

Publication Date 2000-09-22
DOI 10.1039/B005602M
Impact Factor 3.676
Authors

Alison M. De Asha, John T. S. Critchley, A. Elina Siokou, Roger M. Nix


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Abstract

The adsorption of methanol on ordered-epitaxial layers of lanthanum oxide, possessing a La2O3(001)-like structure and grown on a Cu(111) substrate, has been studied using X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS), molecular beam scattering (MBS), temperature-programmed desorption (TPD) and Fourier-transform reflection/absorption infrared spectroscopy (FT-RAIRS). Methanol adsorbs dissociatively at 300 K, with a high sticking probability, to yield surface methoxy species. The methoxy species on the (001)-type terraces of the oxide films are stable to temperatures in excess of 500 K, but then decompose to yield almost exclusively H2 and CO, with only trace quantities of methanol and formaldehyde being simultaneously desorbed. IR spectra also indicate the formation of some formate species on well-oxidised surfaces, and at high coverages the adsorbed methoxy is seen to partially convert upon mild heating to a new species which has characteristics of methyl formate. When regions of the Cu(111) surface are exposed, a greater proportion of the methoxy is converted to formaldehyde.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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