Identification of acid sites by normal probe molecules with SXRD. (IMAGE)
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The Rietveld refined adsorption structures of (A and B) trimethylphosphine oxide, (C and D) acetone, and (E and F) pyridine on H-ZSM-5 by SXRD are shown. The closest contacts between the adsorbates and framework are labeled (in angstroms). Symmetry in adsorption sites is disregarded for clarity. The original synchrotron x-ray diffraction patterns and Rietveld refinement profiles are shown in figs. S28 to S30. The corresponding atomic and crystallographic parameters are summarized in tables S7 to S10. Their adsorption geometries and interactions with framework atoms are also depicted in the SM.
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