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Citation: Zhou Ling-Ping, Deng Liang, Kou Yuan, Li Xuan-Wen. Studies on Acidity and Basicity and Adsorption of Modified Y Zeolites[J]. Acta Physico-Chimica Sinica, ;2002, 18(02): 142-146. doi: 10.3866/PKU.WHXB20020210 shu

Studies on Acidity and Basicity and Adsorption of Modified Y Zeolites

1.
College of Chemistry ＆ Molecular Engineering, Peking University,Beijing　100871

Received Date: 13 August 2001
Available Online: 15 February 2002

The acidity and basicity of alkali cation exchanged Y zeolites were investigated systematically using pyridine and pyrrole as the TPD and IR spectroscopic probe respectively. It was found that the overall Lewis basicity in the modified Y zeolites increased and the Lewis acidity in the modified Y zeolites decreased as the cation was exchanged from LiY to CsY in the alkali cation series. The adsorption of benzene, toluene and ethylbenzene on Y zeolites modified by alkali cations were also studied comparatively by IR spectroscopy and TPD. The following results were obtained: (1)The adsorption of pyridine on modified Y zeolites could also be used to characterize the acidity and basicity of alkali cation exchanged Y zeolites; (2) The C－H stretching frequencies of aromatic ring, of CH3 on the side-chain of toluene, and of －CH2－ on the side-chain of ethylbenzene shifted towards lower wavenumber as the cation was exchanged from LiY to CsY; (3)The adsorption strength and the amount of sorbed aromatics on modified Y zeolites were related to the basicity of alkali cation exchanged Y zeolites.
- Modified Y zeolites;TPD;FTIR;Surface acidity and basicity;Aromatic hydrocarbon adsorption
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