Pd-doped organosilica membranes were prepared by controlling calcination atmospheres(i.e.POS-Air,POS-N2,POS-H2,POS-H2/N2)to tailor their networks for improving their gas separation performance.This study shows that Pd...Pd-doped organosilica membranes were prepared by controlling calcination atmospheres(i.e.POS-Air,POS-N2,POS-H2,POS-H2/N2)to tailor their networks for improving their gas separation performance.This study shows that Pd(Ⅱ)could be only maintained under non-reductive calcination atmosphere,while inert and reducing calcination atmosphere is more beneficial to maintain organosilica moieties in POS networks.POS-H2/N2 membrane showed the optimal H2 separation performance that its permselectivities for H2/CO2,H2/N2,H2/CH4 and H2/SF6 are 15.0,96.7,173.0 and 3400.0,re spectively.Moreover,it is found that H2 molecules pass through the four membranes based on activated diffusion,while CO2 molecules permeation through POS-N2 and POS-Air membrane is dominated by surface diffusion.This work may provide insight into the understanding of the calcination atmosphere effect on gas separation performance of metal-doped organosilica membranes.展开更多
基金Supported by the National Natural Science Foundation of China(21276123,21490581)the National High Technology Research and Development Program of China(2012AA03A606)the“Summit of the Six Top Talents”Program of Jiangsu Province.
文摘Pd-doped organosilica membranes were prepared by controlling calcination atmospheres(i.e.POS-Air,POS-N2,POS-H2,POS-H2/N2)to tailor their networks for improving their gas separation performance.This study shows that Pd(Ⅱ)could be only maintained under non-reductive calcination atmosphere,while inert and reducing calcination atmosphere is more beneficial to maintain organosilica moieties in POS networks.POS-H2/N2 membrane showed the optimal H2 separation performance that its permselectivities for H2/CO2,H2/N2,H2/CH4 and H2/SF6 are 15.0,96.7,173.0 and 3400.0,re spectively.Moreover,it is found that H2 molecules pass through the four membranes based on activated diffusion,while CO2 molecules permeation through POS-N2 and POS-Air membrane is dominated by surface diffusion.This work may provide insight into the understanding of the calcination atmosphere effect on gas separation performance of metal-doped organosilica membranes.
