物理化学学报 >> 1997, Vol. 13 >> Issue (10): 957-960.doi: 10.3866/PKU.WHXB19971020

研究简报 上一篇    

吡咯-IR法测定铝化β沸石的碱性

杨春,王建,须沁华   

  1. 南京大学化学系,南京 210093
  • 收稿日期:1997-03-18 修回日期:1997-05-30 发布日期:1997-10-15
  • 通讯作者: 须沁华

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

Yang Chun,Wang Jian,Xu Qin-Hua   

  1. Department of Chemistry,Nanjing University,Nanjing 210093
  • Received:1997-03-18 Revised:1997-05-30 Published:1997-10-15
  • Contact: Xu Qin-Hua

关键词: 吡咯-IR, 碱性, β沸石, 铝化

Abstract:

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.

Key words: Pyrrole probe, FTIR;Basicity, Zeolite β, Alumination