Small-pore aluminium phosphate molecular sieves with chabazite structure - Incorporation of magnesium in structures -34 and -44

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Small-pore aluminium phosphate molecular sieves with chabazite structure - Incorporation of magnesium in structures -34 and -44

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Title: Small-pore aluminium phosphate molecular sieves with chabazite structure - Incorporation of magnesium in structures -34 and -44
Author: ASHTEKAR, S; PRAKASH, AM; CHAKRABARTY, DK; CHILUKURI, SVV
Abstract: MgAPO and MgSAPO with -34 and -44 framework structures have been synthesized with various amounts of magnesium. Magic-angle spinning (MAS) NMR results showed the presence of three phosphorus environments: P(4Al, 0Mg), P(3Al, 1Mg) and P(2Al, 2Mg) in MgAPO-44 and MgSAPO-44. In MgAPO-34, some of the NMR peaks are split, possibly owing to the presence of non-equivalent T sites. It was indicated from Si-29 MAS NMR results that in MgSAPOs, the magnesium content of the samples affects the silicon environment: with increased magnesium content, more silica-rich regions were formed. Structural acidity, determined from temperature-programmed desorption of ammonia, supported the results on the formation of silica-rich regions in the structure.
URI: http://dx.doi.org/10.1039/ft9969202481
http://dspace.library.iitb.ac.in/xmlui/handle/10054/11811
http://hdl.handle.net/10054/11811
Date: 1996


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