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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62.4kJ·mol~(-1)经过60.3kJ.mol~(-1) 降至HY上的54.6kJ mol~(-1).红外光谱的研究结果表明,苯在NaY上吸附产生的1848和1984cm~(-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。
In this paper, the initial adsorption heat of benzene on NaHY with different Na: H ratios was determined by gas chromatography in the range of 250-300 ℃ .It was found that with the decrease of Na content, the adsorption heat of benzene on NaHY was stepped (62.6kJ · mol ~ (-1)) on NaY after 60.3kJ · mol ~ (-1) decreased to 54.6kJ mol -1 on HY.The results of FT-IR indicated that benzene A pair of absorption bands of 1848 and 1984cm -1 generated on NaY adsorbed on a pair of absorption bands of 1832 and 1975cm -1 generated on HY can characterize Na ~ + and H ~ + .According to the above results, the nature of benzene adsorption sites on NaHY, the adsorption capacity and the localization of Na ~ + ions are discussed.