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Citation: Yang Chun, Wang Jian, Xu Qin-Hua. Basicities of Aluminated Zeolites β:An FTIR Study of Chemisorbed Pyrrole[J]. Acta Physico-Chimica Sinica, ;1997, 13(10): 957-960. doi: 10.3866/PKU.WHXB19971020 shu

Basicities of Aluminated Zeolites β:An FTIR Study of Chemisorbed Pyrrole

1.
Department of Chemistry,Nanjing University,Nanjing 210093

Received Date: 18 March 1997
Available Online: 15 October 1997

The basicities of aluminated zeolites βhave been investigated by FTIR spectra of chemisorbed pyrrole. The NH-stretching frequency of pyrrole adsorbed on the samples shifts towards lower wavenumber as the St/Al ratio is decreased and correlates well with the negative charge on the framework oxygen calculated from the Sanderson electronegativity equalization principle, revealing zeolite β to possess a stronger overall basicity after alumination and, therefore, the alumination to be an effective method to improve the basicity. It is also found that the heterogeneity of basic strength occurs and some stronger basic sites appear after alumination.
- Pyrrole probe,
- FTIR;Basicity,
- Zeolite β,
- Alumination
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