鳥取大学工学部物質工学科Department of Meterials Science, Faculty of Engineerlng, Tottori University
アンモニアの昇温脱離法の実験方法と解析方法について解説した。はじめに，装置を実際に製作できるように実験装置とTPDセルの実例を示した。つぎに，TPDスペクトルから酸量と酸強度をどのように測定するかをのべた。酸量は酸点からの脱離と同定される高温側の脱離ピークから求められる。一方，酸強度を測定するために，新しい理論式を提出した。この理論式から酸強度を測定するための多点法と一点法を紹介した。最後に，Bronsted酸とLewis酸を識別するためのピリジン吸着によるIR法についてのべた。
Recent progress of temperature programmed desorption (TPD) of ammonia to measure the zeolite acidity was summarized. First, details of the experimental apparatus and measurement cell were mentioned. The quantiative method to measure the amount and strength of zeolite acidity was then shown. The desorption peak at higher temperature was ascribable to ammonia molecule which had been adsorbed on the acid sites. A theoretical equation for the TPD on zeolites was derived; based on this equation, the strength of zeolite acidity was able to be detemined. In addition, one-point method to determine the strength of acidity was proposed. Infrared spectroscopyic methods using pyridine adsorption to discriminate between Brønsted and Lewis acid site were also mentioned.
Key words: Acidity; Temperature programmed desorption; Ammonia; Pyridine; Infrared spectroscopy
© 1993 ゼオライト研究会© 1993 Japan Association of Zeolite
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