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Issue 13, 1996
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Small-pore aluminium phosphate molecular sieves with chabazite structure. Incorporation of magnesium in structures -34 and -44

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 29Si 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.

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Article type: Paper
DOI: 10.1039/FT9969202481
Citation: J. Chem. Soc., Faraday Trans., 1996,92, 2481-2486
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    Small-pore aluminium phosphate molecular sieves with chabazite structure. Incorporation of magnesium in structures -34 and -44

    S. Ashtekar, A. M. Prakash, D. K. Chakrabarty and S. V. V. Chilukuri, J. Chem. Soc., Faraday Trans., 1996, 92, 2481
    DOI: 10.1039/FT9969202481

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