Domestically synthesized HZSM-5 and HSZM-11 zeolites were shown to have the same crystal morphology and unit cell dimensions as the Mobil materials. The zeolites were 100% crystalline and crystallographically pure. Sorption of N2, O2, H2S, CO2 and of C3-C10 n-paraffins, of i-C4, i-C5, neopentane, the monomethylnonanes and the xylene isomers was followed by thermogravimetric or volumetric techniques. Generally, the sorption capacity of HZSM-5 was always higher than HSZM-11. The sorption behaviour could be explained by simple models. When pore intersections of both zeolites are considered, the maximum sorption capacity corresponds to the closest possible packing at these intersections. Paraffin sorption occurs according to an end-to-end adsorption model. The concept of total adsorbate length was useful to rationalize the adsorption.
ASJC Scopus subject areas
- Environmental Science(all)