乙炔、丙烯在多种分子筛上的吸附和脱附性质

Adsorption and desorption of acetylene and propylene on zeolites ZSM-5, 13X, Y, MOR, 5A, SAPO-34 as well as on catalyst supports SiO2 and γ-Al2O3 were investigated at 80℃. The results illustrated that there exist strong interaction between the adsorbates and the zeolites, but SiO2 and γ-Al2O3 absorb little acetylene and propylene under the conditions here. On the zeolites with the same topological structure framework, the adsorption capacity for propylene and acetylene decreases with an increase of Si/Al ratio; while the adsorption capacity for propylene is always higher than that for acetylene on the same zeolite. Modification of zeolite may enhance its adsorption capacity; over a chemically modified β zeolite, the saturation adsorption amounts for acetylene and propylene at 80℃ reached 0.11mmol/g and 4.89mmol/g, respectively, which were much higher than the values reported in literature up to now.