Li, Hong-Xin and Davis, Mark E. (1993) Further studies on aluminophosphate molecular sieves. Part 1.—AlPO4-H2: a hydrated aluminophosphate molecular sieve. Journal of the Chemical Society. Faraday Transactions, 89 (6). pp. 951-965. ISSN 0956-5000. http://resolver.caltech.edu/CaltechAUTHORS:LIHjcsft93a
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Pure, highly crystalline AlPO4-H2 is synthesized from an aluminophosphate gel containing dipentylamine and characterized using X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, thermogravimetry and solid-state nuclear magnetic resonance spectroscopy. The AlPO4-H2 structure has orthorhombic symmetry with cell parameters of a= 16.184(5)Å, b= 9.914(3)Å, and c= 8.134(4)Å. It is constructed exclusively from hydrated triple crankshaft chains that also build the 18-membered ring VPl-5. AlPO4-H2 is a microporous, hydrated aluminophosphate with highly elliptical 10-ring channels (2.9 Å by 7.6 Å). One third of the framework Al atoms are octahedrally coordinated to two water molecules and four framework oxygens. Since AlPO4-H2 and VPl-5 share the same structural building unit, some of their physicochemical properties are similar. The existence of AlPO4-H2 and VPl-5 suggests that other molecular sieves with the same type of building unit can be synthesized.
|Additional Information:||© Royal Society of Chemistry 1993 Paper 2/046191; Received 27th August, 1992 Support of this work was provided by Akzo America, Inc. and the NSF Alan T. Waterman Award to M.E.D. We thank Dr. J.B. Higgins at Mobil Research and Development Corporation, Central Research Laboratory (MRDC-CRL) for helpful discussions and Noel Goeke, also at MRDC-CRL, for the SEM. We acknowledge Dr. D.E. Cox for assistance in collecting the synchrotron data. The data were collected at X7A beam line, National Synchrotron Light Source, Brookhaven National Laboratory, which is supported by the U.S. Department of Energy, Division of Material Science and Division of Chemical Science.|
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