Direct observation of surface isocyanate (NCO) formation during the CO+NO reaction on Pt{100}

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Publication Date
DOI 10.1039/A905548G
Impact Factor 3.676
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Abstract

The NO+CO reaction on Pt{100} has been studied using in-situ vibrational spectroscopy (IRAS) under low reaction rate, non-oscillatory conditions. Using a total pressure of 7.5×10-7 mbar and a NO:CO ratio of 2:1, isocyanate (NCO) formation, characterised by an infrared absorption band at 2180 cm-1, is observed over a narrow temperature range, 400–380 K. We propose that NCO formation becomes favourable once the concentration of N atoms on the surface is low and, more importantly, when the diffusion of these atoms becomes severely hindered by the high coverage of CO. The stability of the NCO, above its normal dissociation temperature, is due to the vacant site requirement for the dissociation reaction. The fact that recombination to NCO occurs, after dissociation at 453 K, and in the absence of gas phase NO, indicates that the diffusion of N atoms is hindered even at this higher temperature.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
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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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