Characterization of Supported Gold Catalysts with ~(197)Au Moessbauer Effect Spectroscopy

摘要

We report on a ~(197)Au Moessbauer study of several types of supported gold catalysts. Differences in particle size show up in the Moessbauer spectra by a change in the relative weight of the spectral contribution of the surface atoms. The presence of ionic gold in active gold catalysts is not observed. The spectra can be interpreted in terms of bulk-like contributions from the inner-core atoms plus contributions from the outermost atoms at the surface of the particles.