The mullite phase ceramic membrane was prepared by gradient sintering method.The silicone rubber polymer PDMS with different molecular weights were mixed in different proportions,and coated on the surface of ceramic membrane to cover the surface pore diameter of Ceramic membrane to obtain composite membrane M/PDMS.PDMS improved the adsorption capacity of composite membrane for CO2 and the selectivity of CO2/N2.The physical and chemical properties of the membrane before and after modification were characterized by XRD,SEM and a self-made gas separation device was used to test the permeability rate of the membrane to a single gas and calculate the separation performance of CO2/N2.The results showed that under room temperature conditions and operating pressure of 0.2 MPa,the permeability of the composite membrane to CO2 was as high as 2300 GPU;The CO2/N2 selectivity is 1.52.
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