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Citation: Yang Chun, Xu Qin-Hua. States and Assignment of Aluminium in Zeolite β[J]. Acta Physico-Chimica Sinica, ;1998, 14(02): 169-172. doi: 10.3866/PKU.WHXB19980214 shu

States and Assignment of Aluminium in Zeolite β

Yang Chun ,
Xu Qin-Hua

1.
Department of Chemistry,Nanjing University,Nanjing 210093

Received Date: 13 June 1997
Available Online: 15 February 1998

The states of aluminum in zeolites β were investigated with FTIR spectroscopy. Three kinds of aluminium, framework, nonframework and transient state aluminium, were detected in template-removed zeolite β. The states of aluminium in our samples strongly depends on the nature of the compensating cation, consistent with Brougeat-Lami et al's conclusion. But some new assignments of aluminum species and new opinions about the states of aluminum and their transformation are proposed. From the experimental results, we suggest that, the distortion and tension of zeolite lattice occur when protons, which possess high electron affinity , are located at cationic sites, leading to the breakage of Al-- O bond and the removal of aluminium. The distortion is released when H+ is replaced by other cations (e.g. Na+ ) so that transient state aluminium can back into the framework, while the cationic nonframework aluminium species enter the solution upon the ion-exchange.
- Zeolite β,
- State and assignment of aluminium,
- FTIR
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