DIFFUSION OF P-XYLENE IN SINGLE AND BINARY-SYSTEMS IN ZEOLITES INVESTIGATED BY FTIR SPECTROSCOPY

被引:72
作者
NIESSEN, W [1 ]
KARGE, HG [1 ]
机构
[1] MAX PLANCK GESELL, FRITZ HABER INST, W-1000 BERLIN 33, GERMANY
来源
MICROPOROUS MATERIALS | 1993年 / 1卷 / 01期
关键词
DIFFUSION; COUNTER-DIFFUSION; CO-DIFFUSION; SORPTION; P-XYLENE; BENZENE; H-ZSM-5;
D O I
10.1016/0927-6513(93)80003-D
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
A novel method based on Fourier transform infrared spectroscopy (FTIR) is applied to study sorption and sorption kinetics of p-xylene in ZSM-5-type zeolites as a single component and in a binary-component system, in the presence of benzene under conditions close to those of a catalytic run. From the change of intensities of IR bands characteristic for the adsorbates, diffusivities of p-xylene in the single-component system as well as in the binary-component system are determined at various temperatures and loadings. In comparison with benzene measured as a single component in the same system, the diffusivities of p-xylene are higher by a factor of 2 to 3. This is in agreement with the literature data. In the binary system, the presence of benzene reduces the diffusivities of p-xylene by 30 to 50%. Isotherms, isosteres and isosteric heats of adsorption are determined from the measurements. The isosteric heats of adsorption agree well with the literature data.
引用
收藏
页码:1 / 8
页数:8
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