Highly selective oxygen permeation through a poly(vinylidene dichloride)-cobalt porphyrin membrane: Hopping transport of oxygen via the fixed cobalt porphyrin carrier

Hiroyuki Nishide, Yukihiro Tsukahara, Eishun Tsuchida

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

A combination membrane having both gas barrier properties and selective oxygen-absorbing and -carrying capability was prepared by complexing poly(vinylidene dichloride-co-vinylimidazole) and meso-tetrakis-(α,α,α,α-o-pivalamidophenyl) porphyrinatocobalt (CoP). The vinylidene dichloride copolymer was selected because of its low physical gas permeability and its dense and tough thin-membrane formability even after the CoP complexation. Oxygen permeation was selectively facilitated with the CoP carrier fixed in the membrane, and high oxygen permselectivity (facilitation factor > 25, oxygen/nitrogen permselectivity > 100, permeability 10-10 cm3 (STP) cm cm-2 s-1 cmHg-1) was observed, e.g., for the membrane containing > 20 wt % CoP at an upstream oxygen partial pressure of 0.5 cmHg. The facilitated oxygen transport was properly analyzed by a dual-mode model to give permeation parameters of the membrane such as the postulated diffusion coefficient of oxygen hopping via the fixed CoP carrier (DC). DC was inversely proportional to the average distance between the CoP carrier sites.

Original languageEnglish
Pages (from-to)8766-8770
Number of pages5
JournalJournal of Physical Chemistry B
Volume102
Issue number44
Publication statusPublished - 1998 Oct 29

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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