高温下甲苯在不同去阳离子丝光沸石上的吸附性质和表面反应

高等学校化学学报 ›› 1983, Vol. 4 ›› Issue (6): 757.

高温下甲苯在不同去阳离子丝光沸石上的吸附性质和表面反应

钟万苾, 胡家芬, 钟爱莲, 曹屺娴, 李全芝

复旦大学化学系

收稿日期:1982-05-08 出版日期:1983-12-24 发布日期:1983-12-24

ADSORPTION PROPERTIES AND SURFACE REACTIONS OF TOLUENE ON VARIED DECATIONATED MORDENITES AT HIGHER TEMPERATURES

Zhong Wanbi, Hu Jiafen, Zhong Ailian, Cao Qixian, Li Quanzhi

Department of Chemistry, Fudan University, Shanghai

Received:1982-05-08 Online:1983-12-24 Published:1983-12-24

摘要/Abstract

摘要： 用脉冲色谱法测量了不同交换度的NaHM上甲苯的吸附热,並用动态法测量了程序升温脱附和反应。结果表明:吸附量小于5微升/克,交换度小于32％时,主要显示Na⁺中心的吸附性质。其吸附热基本上不随交换度变化。交换度大于32％时,在H⁺中心上的吸附渐趋显著,吸附热也随交换度的增加而渐次下降。比保留体积随交换度变化的曲线在交换度为32—41％处有极大值。通过吸附熵的计算认为这可能与交换过程中主孔道阳离子空间位阻的下降有关。

Abstract: The adsorption heat of toluene on varied decationated mordenites was determined by pulse chromatographic technique. The temperature programmed desorption and reactions were determined by the flowing method.These results show, when the amount of adsorption is less than 5μl/g and the exchange ratio is less than 32%, it is mainly the adsorption properties of Na⁺ site that appears; the adsorption heat is almost independent of the exchange ratio. When the exchange ratio is more than 32%, with increasing exchange ratio, the adsorption on H⁺ site becomes more and more apparent, and the adsorption heat decreases gradually.The curves of specific retention volume vs exchange ratio pass through a maximum when the exchange ratio is within 32-41%. This phenomenon may be related to the decrease of steric effect of the cations in the main channel with the increase of exchange ratio, according to the values of entropy obtained by calculation.

TrendMD:

钟万苾, 胡家芬, 钟爱莲, 曹屺娴, 李全芝. 高温下甲苯在不同去阳离子丝光沸石上的吸附性质和表面反应. 高等学校化学学报, 1983, 4(6): 757.

Zhong Wanbi, Hu Jiafen, Zhong Ailian, Cao Qixian, Li Quanzhi. ADSORPTION PROPERTIES AND SURFACE REACTIONS OF TOLUENE ON VARIED DECATIONATED MORDENITES AT HIGHER TEMPERATURES. Chem. J. Chinese Universities, 1983, 4(6): 757.