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Pd Doping on H_2/CO_2 Separation Performance and Hydrothermal Stability of Organic-inorganic Hybrid SiO_2 Membranes

ZHANG Heng-Fei;LIU Wei;LEI Jiao-Jiao;SONG Hua-Ting;QI Hong;State Key Laboratory of Materials-Oriented Chemical Engineering, Membrane Science and Technology Research Center, Nanjing Tech University;  
Pd-doped organic-inorganic hybrid SiO_2(POS)sols were synthesized by using 1,2-bis(triethoxysilyl)ethane(BTESE)and palladium chloride as precursors.POS membranes were fabricated via dip-coating process followed by calcination in the water vapor environment.The microstructure of POS powders was characterized by X-ray diffraction(XRD),Fourier transform infrared spectra(FT-IR),N_2 adsorption-desorption,and transmission electron microscope(TEM).Effect of the molar ratio of Pd to Si(n(Pd/Si)=0.1,0.5 and 1)on separation performance and hydrothermal stability of POS membranes was investigated.Results showed that with the increase of Pd doping amount,H_2 permeance of POS membranes increased while the permselectivity of H_2/CO_(2 )decreased.After exposing to100 kPa steam atmosphere for 180 h,H_2 permeance and H_2/CO_2 permselectivity of the POS membrane prepared with n(Pd/Si)of 1 reached 1.62×10~(–7) mol·m~(–2)·s~(–1)·Pa~(–1) and 13.6,respectively.This result indicated that as-prepared POS membrane exhibited good H_2 permeance,H_2/CO_2 permselectivity and hydrothermal stability.
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