Titanosilicate (TS-1, ETS-10) were used as filler in MMMs for application in CO2/CH4 gas separation. Titanosilicates were synthesized in nanoparticle ranges from 260 nm to 610 nm. The content of Ti inside TS-1 plays an important role on separation factor. The content of titanosilicate in MMMs (0–30 wt%) showed an improvement not only on the permeation properties but also on the separation factor.