Decomposition of nitric oxide by rhodium cluster cations at high temperatures

Literature Information

Publication Date 2021-11-23
DOI 10.1039/D1CP04633K
Impact Factor 3.676
Authors

Toshiaki Nagata, Kimihiro Kawada, Xuemei Chen, Masato Yamaguchi, Ken Miyajima, Fumitaka Mafuné


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Abstract

Decomposition reactions of NO molecules on gas-phase Rhn+ (n = 6–9) clusters were investigated by gas-phase thermal desorption spectrometry and density functional theory calculations. We found that NO adsorbs on the clusters, forming RhnNxOx+ at room temperature. Upon heating, NO desorption was observed below 800 K. Above 800 K, while for n = 7 and 8, each of Rh7N3O3+, Rh7N4O4+, and Rh8N3O3+ was found to release an N2 molecule, no N2 formation was clearly observed for Rh6,9NxOy+. We considered that both Rh7N3O3+ and Rh8N3O3+ have at least two dissociated NO molecules, while Rh6NxOx+ (x = 1–3) has one or less. Our computational results for Rh8N3O3+ suggested that the formation of an N–N bond in the Rh8N3O3+ structure must overcome an energy barrier of ∼2 eV, which is the highest among the suggested possible reaction pathways. These findings suggested that the size-dependent activity of NO decomposition is governed primarily by how NO molecules are adsorbed on Rhn+ clusters, i.e. whether two or more N atoms from dissociated NO molecules exist in the NO adsorbed clusters, and secondly, by the readiness of the N–N bond formation.

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Source Journal

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

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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