‘Shape effects’ in metal oxide supported nanoscale goldcatalysts

Literature Information

Publication Date 2011-01-17
DOI 10.1039/C0CP02009E
Impact Factor 3.676
Authors

Matthew B. Boucher, Simone Goergen, Nan Yi, Maria Flytzani-Stephanopoulos


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Abstract

We report the activity of shape-controlled metal oxide (CeO2, ZnO and Fe3O4) supported gold catalysts for the steam reforming of methanol (SRM) and the water gas shift (WGS) reactions. Metal oxide nanoshapes, prepared by controlled hydrolysis and thermolysis methods, expose different crystal surfaces, and consequently disperse and stabilize gold differently. We observe that similar to gold supported on CeO2 shapes exposing the {110} and {111} surfaces, gold supported on the oxygen-rich ZnO {0001} and Fe3O4 {111} surfaces shows higher activity for the SRM and WGS reactions. While the reaction rates vary among the Au–CeO2, Au–ZnO and Au–Fe3O4 shapes, the apparent activation energies are similar, indicating a common active site. TPR data further indicate that the reaction lightoff coincides with the activation of Au–O–M species on the surface of all three oxide supports evaluated here. Different shapes contain a different number of binding sites for the gold, imparting different overall activity.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
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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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