| Studies on basicity of alkali metal catron exchanged β and X zeolites by pyrrole-IR spectroscopy |
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| 作者姓名： | XU Jun YAN Ai-Zhen XU Qin-Hua |
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| 作者单位： | XU，Jun YAN，Ai-Zhen XU，Qin-Hua Department of Chemistry，Nanjing University，Nanjing，Jiangsu 210093，China |
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| 基金项目： | supported by the National Natural Science Foundation of China. |
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| 摘 要： | The strength of basic sites has been measured by pyrrole-IR on alkali metal cation exchanged β and X zeolites, as well as NaOH loaded Naβ. The influence of cation type and the structure of zeolites on their basicity has been studied. The acidic and basic properties of the samples were investigated by NH3-TPD and isopropanol reaction. It was shown that the strength of basic sites on samples could be characterized by the shift of vNH band in the pyrrole-IR spectra. The framework oxygen charges were calculated from the Sanderson electronegativity. The changes in basic properties with various alkali metal cation are consistent with the changes of local oxygen charges of the zeolite framework.
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