Controlling pore structures of Pd-doped organosilica membranes by calcination atmosphere for gas separation

doi:10.1016/j.cjche.2019.03.021

Abstract

Abstract: 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, respectively. 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.

Key words: Pd doping, Organosilica membrane, Calcination atmosphere, Gas separation

摘要： 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, respectively. 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.

关键词: Pd doping, Organosilica membrane, Calcination atmosphere, Gas separation

Yibin Wei, Hengfei Zhang, Jiaojiao Lei, Huating Song, Hong Qi. Controlling pore structures of Pd-doped organosilica membranes by calcination atmosphere for gas separation[J]. Chinese Journal of Chemical Engineering, 2019, 27(12): 3036-3042.

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