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In situ anomalous small-angle X-ray scattering from metal particles in supported-metal catalysts. II. Results

In situ anomalous small-angle X-ray scattering from metal particles in supported-metal catalysts.... Information about the metal phase in a supported-metal catalyst can be obtained using anomalous small-angle X-ray scattering (ASAXS). The difference between the scattering profiles for SAXS at two different wavelengths near the metal's absorption edge is essentially the scattering of the metal alone. Novel in situ ASAXS measurements are made on mordenite impregnated with platinum metal while the temperature and composition of gas in the sample cell are changed. Measurements are made 62 times during treatment of the catalyst. The metal particles are assumed to be randomly distributed spheres with N(R)dR = number of spheres with radii between R and R + dR. It is found that N(R) is always a monotonically decreasing function of R, and that the average value of R, obtained from N(R), decreases by a factor of two over the time (approximately 6 h) for which the system is observed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Crystallography International Union of Crystallography

In situ anomalous small-angle X-ray scattering from metal particles in supported-metal catalysts. II. Results

In situ anomalous small-angle X-ray scattering from metal particles in supported-metal catalysts. II. Results

Journal of Applied Crystallography , Volume 38 (2): 324 – Mar 11, 2005

Abstract

Information about the metal phase in a supported-metal catalyst can be obtained using anomalous small-angle X-ray scattering (ASAXS). The difference between the scattering profiles for SAXS at two different wavelengths near the metal's absorption edge is essentially the scattering of the metal alone. Novel in situ ASAXS measurements are made on mordenite impregnated with platinum metal while the temperature and composition of gas in the sample cell are changed. Measurements are made 62 times during treatment of the catalyst. The metal particles are assumed to be randomly distributed spheres with N(R)dR = number of spheres with radii between R and R + dR. It is found that N(R) is always a monotonically decreasing function of R, and that the average value of R, obtained from N(R), decreases by a factor of two over the time (approximately 6 h) for which the system is observed.

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Publisher
International Union of Crystallography
Copyright
Copyright (c) 2005 International Union of Crystallography
Subject
supported-metal catalyst, catalysis, anomalous small-angle X-ray scattering
ISSN
0021-8898
eISSN
1600-5767
DOI
10.1107/S0021889805002165
Publisher site
See Article on Publisher Site

Abstract

Information about the metal phase in a supported-metal catalyst can be obtained using anomalous small-angle X-ray scattering (ASAXS). The difference between the scattering profiles for SAXS at two different wavelengths near the metal's absorption edge is essentially the scattering of the metal alone. Novel in situ ASAXS measurements are made on mordenite impregnated with platinum metal while the temperature and composition of gas in the sample cell are changed. Measurements are made 62 times during treatment of the catalyst. The metal particles are assumed to be randomly distributed spheres with N(R)dR = number of spheres with radii between R and R + dR. It is found that N(R) is always a monotonically decreasing function of R, and that the average value of R, obtained from N(R), decreases by a factor of two over the time (approximately 6 h) for which the system is observed.

Journal

Journal of Applied CrystallographyInternational Union of Crystallography

Published: Mar 11, 2005

Keywords: supported-metal catalyst ; catalysis ; anomalous small-angle X-ray scattering .

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