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Citation: Deng Feng, Yue Yong, Du You-Ru, Ye Zhao-Hui, Tian Wen-Tong, Pang Wen-Qin. Multinuclear Solid-state NMR Study of Si-VPI-5 Molecular Sieve[J]. Acta Physico-Chimica Sinica, ;1995, 11(05): 385-389. doi: 10.3866/PKU.WHXB19950501 shu

Multinuclear Solid-state NMR Study of Si-VPI-5 Molecular Sieve

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

Received Date: 23 January 1995
Available Online: 15 May 1995

Multinucleax solid-state NMR was employed to study the silicon-substituted molecular sieve Si-VPI-5. 29Si and 27Al NMR suggest that Si can be incorporated into the framework of VPI-5 and the substitution of two silicon atoms for an aluminium atom plus a phosphorus atom is predominant. Such substitution is limited in a certain domain of the crystal and "silicon rich" regions are thus generated. 1H MAS spectra reveal that a small amount of silicon atoms substitute phosphorus only and SiOHAl groups are formed, which provides the acidic source for the molecular sieves. Si-VPI-5 prepared with silica gel as the silicon source exhibits a higher content of SiOHAL groups than that prepared with (EtO)4Si.
- Silicon substitution,
- VPI-5,
- ²⁹Si NMR,
- ¹H MAS NMR
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