titanosilicate molecular seive adsorbents behavior in n2 and ch4 adsorption

Nitrogen removal from natural gas is important in natural gas purifying processes to reach pipeline quality# the ets-4 adsorbent was synthesized, characterized and applied to study equilibrium and kinetic adsorption properties of n2 and ch4# ets-4 was ion-exchanged with ba2+ and after dehydration at 270 ℃, the isotherms and fractional uptake of pure n2 and ch4 gases were measured at 30 ℃ in a constant volumetric apparatus# both na-ets-4 and ba-ets-4 are high potential adsorbents in the kinetic separation of n2/ch4# the presence of ba2+ with bigger size instead of na+ in ets-4 structure leads to relative blockage of pores and also after heat treatment pores become contracted# this prevents ch4 to diffuse ets-4 pores and increases the kinetic selectivity of n2/ch4#