BARIUM-AND CALCIUM-BASED ZEOLITIC ADSORBENT FOR GAS PURIFICATION, IN PARTICULAR AIR

摘要

The invention concerns a calcium and barium cation-exchanged zeolitic adsorbent for use in a process for purifying and or separating a gas or gas mixture, in particular air, so as to eliminate impurities contained therein such as hydrocarbons and nitrogen oxides (NxOy), preferably, among ethylene, acetylene, butane and propane. Preferably, the adsorbent is an X or LSX zeolite exchanged to between 10 and 90 % with calcium cations and to between 10 and 90 % with barium cations, the sum of barium and calcium cations present representing at least 20 % of the exchangeable cations. The purification process is of the TSA type. Advantageously, CO2 impurities and/or water vapour contained in the gas stream are eliminated as well. The invention also concerns a method for making such an adsorbent.