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Citation: Chen Lei, Deng Feng, Ye Chao-Hui. Dealumination of HZSM-5 Zeolite by Calcination:²⁷Al Multiple Quantum MAS NMR Study[J]. Acta Physico-Chimica Sinica, ;2002, 18(09): 786-790. doi: 10.3866/PKU.WHXB20020904 shu

Dealumination of HZSM-5 Zeolite by Calcination:²⁷Al Multiple Quantum MAS NMR Study

1.
State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan　430071

Received Date: 2 January 2002
Available Online: 15 September 2002

The coordination states of aluminum species in calcined HZSM-5 zeolites have been investigated using 29Si, 27Al MAS and 2D MQMAS NMR methods. A broad peak at δ 45 in presents in the 27Al MAS NMR spectra of calcined HZSM-5 zeolites. From the 27Al 3QMAS NMR spectrum, it is evident that the peak at δ 45 comes mainly from the distorted tetrahedral Al with a quadrupolar-coupling constant of 5.2 MHz. Simulation of the 27Al 1D MAS NMR spectra of samples calcined at 700 and 750 ℃ shows that a small peak at about δ 30 emerges, which is probably due to 5- coordinated non-framework Al. The existence of this Al species is also confirmed by 27Al 3QMAS NMR.HZSM-5 zeolite calcined at temperature higher than 700 ℃ suffers severe dealumination. Calcination causes part of the Al species “NMR invisible” in the corresponding 27Al MAS spectra.
- HZSM-5;NMR;MQMAS;Dealumination;Calcination
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沈阳化工大学材料科学与工程学院沈阳 110142

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Dealumination of HZSM-5 Zeolite by Calcination:27Al Multiple Quantum MAS NMR Study

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通讯作者: 陈斌, bchen63@163.com

Dealumination of HZSM-5 Zeolite by Calcination:²⁷Al Multiple Quantum MAS NMR Study