FTIR study of CO and NO adsorption and coadsorption on a Cu/SiO2 catalyst: Probing the oxidation state of copper

文献信息

发布日期 2001-02-15
DOI 10.1039/B009649K
影响因子 3.676
作者

H. Knözinger


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摘要

At room temperature CO is adsorbed strongly on Cu+ sites (band at 2131 cm−1) whereas NO is preferably adsorbed on Cu2+ sites (band at 1882 cm−1). Coadsorption of CO and NO allows simultaneous and selective detection of both kinds of cations. This observation is used to follow the changes on the sample surface occurring in the presence of oxygen. Addition of small amounts of O2 to the CO–NO–Cu/SiO2 system first leads to the oxidation of the Cu+ sites to Cu2+. This process is followed by formation of surface nitrates which block the Cu2+ sites for NO adsorption. Adsorption of CO at 85 K allows detection of Cu2+ cations (ca. 2200 cm−1) in addition to the Cu+, CO is replaced by NO from these sites. Cu0 sites form carbonyls which, when copper is highly dispersed, can absorb at the same frequency at which Cu+–CO carbonyls are detected. In this case both kinds of species could be distinguished by their stability: the Cu0–CO species are easily destroyed during evacuation.

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DOI: 10.1039/B810191B

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来源期刊

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
自引率: 10.3%
年发文量: 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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