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Small-Angle X-Ray Scattering of Carbon-Supported Metal Catalysts

Published online by Cambridge University Press:  28 February 2011

J Goodtsman ,
M. G. Phillips  and
H. Brumberger
J Goodtsman
Affiliation:
Syracuse University, Dept. of Chemistry, Syracuse, N.Y. 13244-1200
M. G. Phillips
Affiliation:
SUNY College at Cortland, Dept. of Chemistry, Cortland, N.Y. 13045
H. Brumberger
Affiliation:
Syracuse University, Dept. of Chemistry, Syracuse, N.Y. 13244-1200
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Abstract

The slit-smeared intensity of X-radiation scattered from carbon-supported metal catalysts behaves as clh−1 + c2h−3 for higher h-values in the small-angle region (h+4πλ−1 sinθ, λ + X-ray wavelength,θ + half of scattering angle, c1, c2 are constants). For three-phase systems with sharp phase boundaries, uniform electron-densities in the metal and void phases, and lamellar electrondensity fluctuations in the carbon phase, the small-angle X-ray scattering (SAXS) can be described in terms of inter- and intraphase electron-density correlation functions, and can be shown to yield the observed behavior. Further assumptions are required to separate these contributions and calculate interfacial specific surfaces. SAXS measurements on Pt, Ru, Pd, and Rh/C are presented.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 111: Symposium O – Microstructure and Properties of Catalysts , 1987 , 241
Copyright
Copyright © Materials Research Society 1988

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