DTA-GC Combination for Measuring Adsorption Heat--The Investigation of Differential Heat of Adsorption for Pyridine on γ-Al2O3and NaX Zeolites

Abstract

Abstract: The differential heats of adsorption for pyridine on γ-Al₂O₃ and NaX zeolites at 170℃～270℃ have been measured by a DTA-GCadsorption calorimetric system we designed. It is verified that the acidic sites on the surface of γ-Al₂O₃ are mainly L-acid sites. The acid amount would be reduced and the acid strength would be decreased as the temperature is raised. The decreasing extent of the acid strength at one adsorption site is not the same as that at another. There are two types of acidic sites which adsorb pyridine irreversibly and reversibly on the surface of NaX zeolite. The stronger type is the non-active L-acid site and the weaker one the active B-acid site. The Influence of the temperature variation upon the two types of acidic sites is not the same. The calculation result shows that the total adsorption sites in β-cages and octahedral zeolite cages are partly occupied by H₂O molecules.

Key words: Adsorption heat, DTA-GC combination, Pyridine, γ-Al₂O₃zeolite, NaX zeolite

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Liu Chao-gang, Hu Ji-hua, Zheng Zhong. DTA-GC Combination for Measuring Adsorption Heat--The Investigation of Differential Heat of Adsorption for Pyridine on γ-Al₂O₃and NaX Zeolites[J]. Chem. J. Chinese Universities, 1991, 12(6): 827.

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DTA-GC Combination for Measuring Adsorption Heat--The Investigation of Differential Heat of Adsorption for Pyridine on γ-Al₂O₃and NaX Zeolites

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