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

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, w...

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Bibliographic Details
Published in:Chinese journal of chemical engineering 2019-12, Vol.27 (12), p.3036-3042
Main Authors: Wei, Yibin, Zhang, Hengfei, Lei, Jiaojiao, Song, Huating, Qi, Hong
Format: Article
Language:English
Subjects:
Calcination atmosphere
Gas separation
Organosilica membrane
Pd doping
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Summary: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.
ISSN:1004-9541
2210-321X
DOI:10.1016/j.cjche.2019.03.021