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Citation: Deng Feng, Dong Jin-Xiang, Du You-Ru, Ye Chao-Hui. Solid-state NMR Studies on AlPO₄-5 Molecular Sieve with Al/P>1[J]. Acta Physico-Chimica Sinica, ;1997, 13(09): 780-785. doi: 10.3866/PKU.WHXB19970903 shu

Solid-state NMR Studies on AlPO₄-5 Molecular Sieve with Al/P>1

1.
Laboratory of Nuclear Magnetic Resonance and Atomic and Molecular Physics,Wuhan Institute of Physics,The Chinese Academy of Sciences,Wuhan 430071

Received Date: 6 January 1997
Available Online: 15 September 1997

Solid-state NMR spectroscopy was employed to investigate the coordination state of P and Al, as well as their linkages in a series of newly synthesized alunilnophosphate molecular sieve AlPO4-5 with Al/P>1. Both 31P and 27Al NMR provides evidence that Al-O-Al linkages are present in the framework of these molecular sieves, which implies that the ordering arrangement of P and Al does not obey the well-known Loewenstein rule. Apart from the usually observed NMR signals, a broad peak at ca. δ=10 is present in the 27Al MAS spectra of the calcined and dehydrated AlPO4-5 molecular sieves. Due to its large second-order quadrupole shift, an isotropic chemical shift of ca. δ=38 was estimated. Hence, we attribute this signal to 4-coordinated aluminum: Al[nAl, (4-n)P )](n=1,2,3,4). Similarly, an additional broad signal at δ=-24 was observed in the corresponding 31P MAS spectra and is due to the P coordination state in which its second coordinated shell contains Al: P[nAl, (4-n)P]second shell (n=1,2,3,4).
- AlPO₄-5,
- Al/P>1;Al-O-Al linkage,
- ³¹P and ²⁷Al NMR
  ,
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Solid-state NMR Studies on AlPO4-5 Molecular Sieve with Al/P>1

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Solid-state NMR Studies on AlPO₄-5 Molecular Sieve with Al/P>1