Study on Thermal Desorption of Aromatic Guest Molecules Adsorbed in Zeolites
Study on Thermal Desorption of Aromatic Guest Molecules Adsorbed in Zeolites
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DOI：
10.5702/massspec.54.127
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发表时间：
2006-08
期刊：
影响因子：
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通讯作者：
T. Arii;Y. Oishi;S. Hashimoto
中科院分区：
文献类型：
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作者：
T. Arii;Y. Oishi;S. Hashimoto
用热重-差热分析和程序升温脱附-质谱法成功地研究了吸附在Y和X沸石上与Na+、Tl+和K+等阳离子交换的芳香族客体分子菲的热脱附。菲在沸石上的热脱附发生在300℃~800℃之间，热脱附温度主要取决于Na+<；Tl+<；K+的温度顺序。相反，用Ozawa方法估算的三种阳离子交换Y分子筛的菲脱附活化能几乎相同，近似为120kJ·mol~(-1)。另一方面，阳离子交换的X沸石对菲的脱附活化能大于Y沸石的脱附活化能，估计约为140kJ·mol-1。结果表明，菲从沸石上解吸的活化能与沸石中的电荷补偿阳离子没有直接关系，而与沸石的骨架结构密切相关。
Thermal desorption for an aromatic guest molecule of phenanthrene adsorbed in Y and X zeolites exchanged with cations such as Na+, Tl+ and K+ has been studied successfully by means of TG-DTA and temperature programmed desorption (TPD)-MS. The thermal desorption of phenanthrene from the zeolites took place at temperatures between 300°C and 800°C. The temperature of thermal desorption depended critically on the cations in the order of the temperature of Na+<Tl+<K+. On the contrary, the activation energy for the desorption of phenanthrene estimated in terms of the Ozawa method, was almost the same for the three cation-exchanged Y zeolites with the approximate values of 120 kJ mol-1. On the other hand, the activation energy for the desorption of phenanthrene from the cation-exchanged X zeolites was the larger than that obtained from the Y zeolites, and was estimated as approximately 140 kJ mol-1. It is concluded that the activation energy for the desorption of phenanthrene from the zeolites does not directly correlate with the charge-compensating cation in the zeolites and depends strongly on the framework structures of the zeolites.