Document Type

Article

Date

11-9-2004

Embargo Period

2-4-2013

Keywords

metal; platinum; absorption; article; catalysis; catalyst; catalyst support; mathematical analysis; mathematical computing; neutron scattering; radiation scattering; spectral sensitivity; temperature; X ray crystallography

Disciplines

Chemistry

Description/Abstract

A supported-metal catalyst can be considered as a mixture of three homogeneous phases: support, void and metal. Information about the metal phase alone can be obtained using anomalous small-angle X-ray scattering (ASAXS), which requires measuring the SAXS for two different wavelengths near the metal's absorption edge. Herein, the conditions that must be obtained so that the difference between the two scattering profiles gives the scattering of the metal alone are presented. In a following contribution, the analysis will be applied to in situ ASAXS measurements made on mordenite impregnated with platinum metal while the temperature and composition of gas in the sample cell are changed. The metal particles are assumed to be randomly distributed spheres with N(R)dR being the number of spheres with radii between R and R + dR. From N(R) one can obtain the average value of R.

Additional Information

Copyright 2004 Journal of Applied Crystallography. This article may be downloaded for personal use only. Any other use requires prior permission of the author and Journal of Applied Crystallography.

The article may be found at doi:10.1107/S0021889804029000

Source

local input

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 License.

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Chemistry Commons

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