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| - SSZ-51A New Aluminophosphate Zeotype: Synthesis,Crystal Structure, NMR, and Dehydration Properties
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| - Hydrothermal synthesis in the presence of fluoride produces a new aluminophosphate zeotype, SSZ-51. The new material has a two-dimensional channel system. SSZ-51 is stable to calcination but exposure to water results in reversible loss of long-range order in the structure.
- A new aluminophosphate zeotype framework structure, SSZ-51 (Al4(PO4)4F.C7N2H11·0.5H2O), has been prepared in the presence of 4-dimethylaminopyridine as a structure-directing agent and a fluoride ion-mineralizing agent. The structure of the material wassolved using single-crystal X-ray diffraction at a synchrotron source. It is closely related tothe structure of SAPO-40 (AFR) and contains intersecting channels delimited by 8- and 12-membered ring windows. The occluded structure-directing agent and fluoride can be calcinedto yield a material with appreciable microporosity. The calcination and dehydration of SSZ-51 was followed using variable temperature synchrotron X-ray powder diffraction and showedthat the adsorption of water at low temperatures leads to a loss in long-range order of theframework. The long-range order of the framework is regained by dehydration at temperatures above 100 °C.
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