On the Determination of the Location of Metal Clusters Supported on Molecular Sieves by X-ray Absorption Spectroscopy

摘要: Typically, smaller metal−metal contributions are found in the EXAFS of zeolite supported metals compared to on nonporous supports. Two factors may account for this, i.e., (i) a average coordination number, which is related metal particles, and (ii) an increase Debye−Waller factor indicating less ordered clusters. Based experimental results as well theoretical calculations we compare both effects assign decrease exponential dampening oscillations resulting from lattice atoms. This leads factor, not statistical order clusters zeolite. The model discussed can be used indication location small porous It shown that large value Δσ2, addition particle size, determine particles o...