Study on the acidity of modified β-zeolites by FTIR spectroscopy

Zongxuan Jiang; Shuchun Meng; Guangming Tong; Zili Wu; Can Li; Qin Xin

Study on the acidity of modified β-zeolites by FTIR spectroscopy

Zongxuan Jiang, Shuchun Meng, Guangming Tong, Zili Wu, Can Li, Qin Xin

Research output: Contribution to journal › Article › peer-review

Abstract

The acidity of modified β-zeolites was studied by FTIR spectroscopy. Five types of hydroxyl groups present in the hydrothermally treated β-zeolites and its modifed β-zeolites by dealumination with Na₂H₂EDTA and HCl, absorbing at 3746, 3740, 3730, 3605 and 3551cm^-1 were identified and assigned to Si-OH groups on amorphous silica-alumina debris, silanol groups on extraframework silicon-rich debris, terminal/internal framework Si-OH, framework and hydrogenbonded hydroxyl groups, respectively. The effect of adsorption of benzene and pyridine on these hydroxyl groups has been characterized. The results reveal that the following decreasing order for the acidic strength of the framework hydroxyl groups on the β-zeolites at different reatment conditons is derived: dealumination with HCl > hydrothermall treatment > dealumination with Na₂H₂EDTA.

Original language	English
Pages (from-to)	34
Number of pages	1
Journal	Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis
Volume	18
Issue number	4
State	Published - 1998
Externally published	Yes

Cite this

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title = "Study on the acidity of modified β-zeolites by FTIR spectroscopy",

abstract = "The acidity of modified β-zeolites was studied by FTIR spectroscopy. Five types of hydroxyl groups present in the hydrothermally treated β-zeolites and its modifed β-zeolites by dealumination with Na2H2EDTA and HCl, absorbing at 3746, 3740, 3730, 3605 and 3551cm-1 were identified and assigned to Si-OH groups on amorphous silica-alumina debris, silanol groups on extraframework silicon-rich debris, terminal/internal framework Si-OH, framework and hydrogenbonded hydroxyl groups, respectively. The effect of adsorption of benzene and pyridine on these hydroxyl groups has been characterized. The results reveal that the following decreasing order for the acidic strength of the framework hydroxyl groups on the β-zeolites at different reatment conditons is derived: dealumination with HCl > hydrothermall treatment > dealumination with Na2H2EDTA.",

author = "Zongxuan Jiang and Shuchun Meng and Guangming Tong and Zili Wu and Can Li and Qin Xin",

year = "1998",

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journal = "Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis",

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T1 - Study on the acidity of modified β-zeolites by FTIR spectroscopy

AU - Jiang, Zongxuan

AU - Meng, Shuchun

AU - Tong, Guangming

AU - Wu, Zili

AU - Li, Can

AU - Xin, Qin

PY - 1998

Y1 - 1998

N2 - The acidity of modified β-zeolites was studied by FTIR spectroscopy. Five types of hydroxyl groups present in the hydrothermally treated β-zeolites and its modifed β-zeolites by dealumination with Na2H2EDTA and HCl, absorbing at 3746, 3740, 3730, 3605 and 3551cm-1 were identified and assigned to Si-OH groups on amorphous silica-alumina debris, silanol groups on extraframework silicon-rich debris, terminal/internal framework Si-OH, framework and hydrogenbonded hydroxyl groups, respectively. The effect of adsorption of benzene and pyridine on these hydroxyl groups has been characterized. The results reveal that the following decreasing order for the acidic strength of the framework hydroxyl groups on the β-zeolites at different reatment conditons is derived: dealumination with HCl > hydrothermall treatment > dealumination with Na2H2EDTA.

AB - The acidity of modified β-zeolites was studied by FTIR spectroscopy. Five types of hydroxyl groups present in the hydrothermally treated β-zeolites and its modifed β-zeolites by dealumination with Na2H2EDTA and HCl, absorbing at 3746, 3740, 3730, 3605 and 3551cm-1 were identified and assigned to Si-OH groups on amorphous silica-alumina debris, silanol groups on extraframework silicon-rich debris, terminal/internal framework Si-OH, framework and hydrogenbonded hydroxyl groups, respectively. The effect of adsorption of benzene and pyridine on these hydroxyl groups has been characterized. The results reveal that the following decreasing order for the acidic strength of the framework hydroxyl groups on the β-zeolites at different reatment conditons is derived: dealumination with HCl > hydrothermall treatment > dealumination with Na2H2EDTA.

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M3 - Article

AN - SCOPUS:3342885646

SN - 1000-0593

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JO - Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis

JF - Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis

IS - 4

ER -

Study on the acidity of modified β-zeolites by FTIR spectroscopy

Abstract

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