Determination of the nature and reactivity of copper sites in Cu–TiO2catalysts

Literature Information

Publication Date 2000-10-16
DOI 10.1039/B005331G
Impact Factor 3.676
Authors

Fernando Coloma, Francisco Marquez, Colin H. Rochester, James A. Anderson


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Abstract

XPS, temperature programmed reduction (TPR) and FTIR spectroscopy of adsorbed CO and the hydrogenation of crotonaldehyde were used to study the nature of the surface species present for two Cu–TiO2 catalysts (2 and 5% Cu) subjected to reduction in hydrogen at 523, 623 and 723 K. Despite TPR and XPS evidence for complete reduction, IR studies gave clear evidence for the presence of surface Cu(II) ions and two distinct types of Cu(I) sites. The large absorption coefficient for CO on the latter meant that spectra were dominated by bands due to CO on Cu+ even though these ions made up less than an estimated 10% of the total exposed copper sites. Exposed Cu+ remained after re-oxidation treatment, at 623 K in oxygen but this treatment, when followed by 523 K reduction, did not recover Cu(0) sites lost by high temperature reduction, indicating that sintering rather than encapsulation by TiOx was responsible for loss of copper surface area.

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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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