Adsorptive separation properties of CO₂/CH₄/N₂ on UZM-9 synthesized by seed-assisted method

The UZM-9 zeolite was synthesized in 48 h via a seed-assisted method, in which TEAOH and TMAOH were used as organic structure directing agent (OSDA) while acid-treated UZM-9 zeolites were employed as seeds. The textural properties and hydrophobicity of the as synthesized UZM-9 zeolites and their adsorption properties for CO₂/CH₄/N₂ were characterized by XRD, physical adsorption, SEM, ICP and TG, respectively. The results show that UZM-9 zeolites can be obtained in 2 d with the Si/Al atomic ratio up to 3 and the yield up to 65%. At 298 K and 1atm, the capacity and adsorption heat of CO₂ are 5 mmol/g and 34 kJ/mol, and the selectivity of CO₂/CH₄, CO₂/N₂ and CH₄/N₂ are 100, 240 and 2.4 respectively. These results reveal that the as synthesized UZM-9 zeolites have good performances for carbon capture and possess considerable water resistance.