Surface characterization of alumina-supported catalysts prepared by sol–gel method. Part II.—Surface reactivity with CO

Literature Information

Publication Date 2001-02-27
DOI 10.1039/B009956M
Impact Factor 3.676
Authors

Emmanuel Joubert, Jean-Christophe Ménézo, Daniel Duprez, Jacques Barbier, Nicolas Bion, Marco Daturi, Jacques Saussey, Jean-Claude Lavalley, Hideaki Hamada


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Abstract

Surface reactivity toward H2 and CO using a pulse method was investigated for Al2O3, In2O3–Al2O3 and Ga2O3–Al2O3. It was found that reduction by either CO or H2 and reoxidation by O2 occurred reversibly on In2O3–Al2O3. Although the surface of Ga2O3–Al2O3 was hardly reduced by H2, CO consumption and CO2 formation was observed on exposure to CO. Mass spectroscopic analysis revealed the formation of H2 from injection of CO pulses on Ga2O3–Al2O3, while small amounts of H2 were detected on In2O3–Al2O3. The formation of H2 on Ga2O3–Al2O3 was also evidenced by Fourier transform infrared (FT-IR) spectroscopy. Namely, when Ga2O3–Al2O3 was exposed to CO at elevated temperatures above 573 K, the IR band assignable to Gay+–H species was detected at 1997 cm−1. A reaction model in which the reaction of CO with basic hydroxy groups occurs on the surface of Ga2O3–Al2O3 (CO + OH → CO2 + 1/2H2) is proposed.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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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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