Most new air separation plants use "molecular sieves" and "pre-purification units" (PPU) to remove carbon dioxide by adsorbing these molecules to the surface of the "molecular sieve" material by adsorbing them at near ambient temperature. And water. XINTAO molecular sieve 13X APG together with XINTAO activated alumina KA-405, can be used for cryogenic air separation to remove moisture and CO2. XINTAO activated alumina KA-405 removes most of the water, while XINTAO molecular sieve 13X APG removes most of the carbon dioxide.