1 鳥取大学工学部物質工学科Department of Materials Science, Faculty of Engineering, Tottori University ◇ 〒680-8552 鳥取県鳥取市湖山町南 4-101
2 独立行政法人科学技術振興機構戦略的創造研究推進事業（さきがけ）PRESTO, Japan Science and Technology Agency
ゼオライトなど固体酸の酸量・酸強度・酸強度分布を測定するためのアンモニア昇温脱離（TPD）法の実験および解析法について，特に，従来の手法の問題点，これを克服するための手法について詳しく解説する。従来の実験法ではアンモニアを固体に吸着させ，その後の昇温による脱離を観察していたが，水素結合種などの不要な吸着種が含まれていた。アンモニア吸着後に水蒸気処理を行うと不要な吸着種は除去され，真の酸性質を測定できる。脱離過程は平衡に支配されており，再吸着の影響で脱離温度は酸強度を直接に表さないが，導出した解析理論によってアンモニア吸着熱（酸強度の尺度）を計算できる。
Experimental and analytical methods of ammonia temperature-programmed desorption (TPD) for measurements of acidic properties of zeolites and other solid acid catalysts are introduced. Particularly, problems in the conventional methods and improvements for overcoming them are detailed. In the conventional experiments, the desorption has been observed after the adsorption of ammonia on a solid, but unnecessary an adsorbed species such as hydrogen-bonded ammonia has been involved in the spectum. A water vapor treatment after the adsorption of ammonia removes the unnecessary species to clarify the intrinsic acidity. The desorption process is controlled by equilibrium, and the desorption temperature is affected by re-adsorption of ammonia, and so it does not directly show the acid strength. However, now it is possible to calculate the heat of ammonia adsorption as an index of the acid strength according to the derived theory.
Key words: ammonia TPD; solid acidity; water vapor treatment; analytical theory; curve fitting method
© 2004 ゼオライト学会© 2004 Japan Association of Zeolite
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