ADSORPTION OF NITROGEN, HYDROGEN, METHANE, AND CARBON OXIDES ON MICRO- AND MESOPOROUS MOLECULAR SIEVES OF DIFFERENT NATURE

摘要

A comparative study was carried out on the adsorption of H2, N2, CH4, CO, and CO2 at 77-273 K(p ≤ 1 atm) by silicate and phosphate zeolites and carbon materials, varying in size, shape, volume, and distribution of the micro- and mesopores. We studied effects of the porosity parameters and nature of the surface on gas absorption, in particular, the increased selectivity related to restrictions in the zeolite micropores, the presence of the cationic and acid protic sites as well as decreasing size of the micropores in the carbon adsorbents. The greatest separation of the methane-containing gas mixtures was found for zeolites with MFI channel structures. The greatest separation of the hydrogen-containing mixtures was found for cavity-type LTA, FA U, and CHA zeolites.