Citation: Liu Guan-Hua, Li Xuan-Wen, Liu Xing-Yun, Pang Li. ADSORPTION HEAT AND IR STUDY OF BENZENE ADSORBED ON NaHY ZEOLITES[J]. Acta Physico-Chimica Sinica, 1990, 6(06): 666-672. doi: 10.3866/PKU.WHXB19900607
苯在NaHY沸石上的吸附热及红外光谱研究
本文用气相色谱法在250-300 ℃的范围内, 测定了苯在不同Na:H比的NaHY的初始吸附热. 结果发现 ,随着Na含量的减少, 苯在NaHY上的吸附热作阶梯式的下降, 即由NaY上的62.4 kJ·mol~(-1)经过60.3 kJ.mol~(-1)降至HY上的54.6 kJ mol~(-1). 红外光谱的研究结果表明, 苯在NaY上吸附产生的1848和1984 cm~(-1)一对吸收带,在HY上吸附产生的1832和1975cm~(-1)一对吸收带,可以分别表征苯和NaHY中的Na~+以及H~+的作用. 根据上述结果讨论了苯在NaHY上吸附位的性质、吸附作用的强弱以及Na~+离子的定位状况。
English
ADSORPTION HEAT AND IR STUDY OF BENZENE ADSORBED ON NaHY ZEOLITES
Initial adsorption heat of benzene on NaHY of different Na:H ratios have been determined in the temperature range of 250--300 ℃ by gas chromatographic pulse method. It was found that the adsorption heat decreases stepwisely with the decrease of Na content in NaHY: It is 62.4 kJ·mol~(-1) for Na:H<0.6, 60.3 kJ·mol~(-1) for 0.14<? Na /><Na:H<0.6, discussed. are zeolites NaHY in cation Na~+ of location the and strength adsorption sites, property results, above-mentioned on Based NaHY. sites H~+ benzene between interactions distinguish to used be could pairs two These cm~(-1). 1975 1832 at appears pair another HY while cm~(-1), 1948 1848 bands a displays NaY adsorbed that show data IR The interaction types three there means This HY. for Na:H<0.14 kJ·mol~(-1) 54.6></Na:H<0.6,>
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