期刊
CHEMISTRY OF MATERIALS
卷 21, 期 18, 页码 4339-4346出版社
AMER CHEMICAL SOC
DOI: 10.1021/cm901883e
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资金
- Swiss-Norwegion Beamline (SNBL)
- Deutsche Forschungsgemeinschaft
- Metal-Substrate Interactions in Heterogeneous Catalysis [SFB 558]
The three-dimensional structure of crystalline, calcined pure siliceous MCM-22 (which has a chemical formula of Si72O144) and its delaminated derivative, ITQ-2 (which has a chemical formula of Si144O288), also in its calcined form, have been studied using synchrotron radiation-based powder diffraction experiments employing full pattern Rietveld analysis for structure elucidation. Because of the limited structural coherence in ITQ-2, conventional analysis of the X-ray diffraction experiments using Bragg peaks only is not suitable. Instead, we applied the pair distribution function (PDF) technique to study the structure of ITQ-2, in particular, the termination of the layer slab. Despite of the structural complexity of the zeolite materials, excellent confirmation of the crystal structure based on Rietveld analysis (R-Bragg = 12.6%) was obtained with PDF analysis (R-w = 18.3%) for the calcined siliceous MCM-22. Based on results of the crystalline compound, we only succeeded to refine the diffraction data set of the delaminated material applying PDF analysis.
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