Preparation and Gas Separation Performance of P25 Hybrid Carbon Membranes

P25 hybrid carbon membranes were prepared by adding the commercial P25 particles into the precursor. Effects of P25 particles on the pyrolysis, carbon structure and gas separation performance of hybrid carbon membranes were characterized by means of TG, SEM, TEM and XRD. The results indicate that the thermal stability of polymer precursor is improved by the incorporation of P25 particles. Gas separation performances of hybrid carbon membrane are greatly improved with the addition of P25 particles due to the accumulate voids formed by the agglomeration of P25 particles and interfacial pores formed between P25 particles and carbon matrix. Molecular sieve mechanism is still conformed in the gas separation of hybrid carbon membranes. Gas permeability increases and gas selectivity remains with the increase of P25 loading. And the gas permeability reduces and gas selectivity increases as final carbonization temperature rises. The permeabilities of H2, CO2, O2, N2 and CH4 are 1769.2, 1558.6, 410.2, 55.5, 26.8 Barrer, respec- tively, for the hybrid carbon membrane prepared with 20wt% P25 loading and at 700℃ carbonization temperature.