ADSORPTION OF M-XYLENE IN GAS-PHASE ON NA Y, KY AND BAY ZEOLITES - COMPARISON WITH THE ADSORPTION OF P-XYLENE

Thermogravimetry is used to study the adsorption of m-xylene on NaY, K Y and BaY zeolites. The aim of this work is to take into account the t emperature as a fundamental parameter in the control of isobaric or is othermal adsorption. The results are analysed using Henry, Langmuir, F owler and Polanyi-Dubinin models. The adsorption of m-xylene is little different.from that of p-xylene. The affinity of adsorption depends u pon the nature of the compensator cation and the temperature. At low f illing coefficient, the BaY zeolite shows a greater affinity for the x ylenes than the other two zeolites and the NaY zeolite adsorbs more m- xylene than p-xylene inversely as the KY and BaY zeolites. The adsorpt ion of xylenes is not restricted to the available volume of cages alph a but extends, from low relative pressure, to the external surface of the zeolite.