Enhanced stability and facilitation in oxygen transport through cobalt porphyrin polymer membranes

Nishide, Hiroyuki; Kawakami, Hiroyoshi; Suzuki, Takayuki; Azechi, Yasutaka; Tsuchida, Eishun

doi:10.1021/ma00217a031

Cited by 28 publications

(10 citation statements)

References 9 publications

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“…K was taken from Fig. 1 to be 1.OX lb cm3 (polymer)/cm3 (gaseous oxygen, STP) or 2.2 X lo3 l/mol, which almost agrees with the K value estimated for the corresponding COP complex in a toluene solution [2]. The apparent enthalpy change (AHapp) and the apparent entropy change (ASapp) for the oxygen binding to COP fixed in the membranes were estimated from the temperature dependence of Kapp and are also given in Table 1.…”

Section: Resultssupporting

confidence: 72%

Oxygen dissolution and transport in cobaltporphyrin‐bound organophosphazene membranes

Nishide

Kawakami

Nishihara

et al. 1993

Polymers for Advanced Techs

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Rubbe y poly(organophosphazene)s were synthesized, and were combined with cobaltporphyrin (COP) which binds molecular oxygen rapidly and reversibly. The apparent oxygen-binding equilibrium constant (Kapp) is in proportion to the physical solubility coefficient of oxygen in the polymer, although the reduced equilibrium and thermodynamic parameters are not dependent on the polymer matrix species. Diffusivity of oxygen via the fixed CoP(Dc) is enhanced for poly(organophosphazene) membranes with a larger oxygen diffusion constant. Poly(organophosphazene) membranes with both a large Kapp and Dc yield high oxygen permeability.

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Section: Resultssupporting

confidence: 72%

Oxygen dissolution and transport in cobaltporphyrin‐bound organophosphazene membranes

Nishide

Kawakami

Nishihara

et al. 1993

Polymers for Advanced Techs

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“…This signal was assigned to the cobalt-oxygen adduct in the literature. [15][16][17] The agreement between the cyclic experiments and the above results shows that the oxygen-binding equilibrium process was reversible.…”

Section: Oxygen-enriching Propertiessupporting

confidence: 68%

Facilitated oxygen transport in a novel silicone polymer membrane containing carboxylic cobalt groups

Zhang

2003

J of Applied Polymer Sci

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A novel silicone polymer membrane with facilitated oxygen transport properties was prepared by using 11-alkene acid cobalt, a silicone rubber containing vinyl groups of 5 mol %, a hydrogen-containing silicon oil, and chlorine platinum acid. The solution casting and the vulcanization were carried out simultaneously at room temperature. Investigation showed that Po 2 increased and Pn 2 did not change with decreasing gas pressure difference. This facilitated oxygen transport behavior was contributed by a polymeric cobalt complex formed from carboxylic groups and cobaltous ions in the membrane to result in the simultaneous increase of both Po 2 and ␣o 2 /n 2 under lower gas pressure difference. For example, the Po 2 and ␣o 2/ n 2 of the membrane containing 11-alkene acid cobalt of 2.5 wt% were 750 Barrer and 3.09 under a gas pressure difference of 0.05 mPa. As much as 5 wt% 11-alkene acid cobalt could be added to the membranes; Po 2 and ␣o 2/ n 2 increased to 802 Barrer and 3.34 respectively when the membrane contained 11-alkene acid cobalt of 5 wt %.

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“…Transition metal macrocyclics such as pthalocyanines and porphyrins have been of particular interest. The reversible O 2 binding capacity of cobalt phthalocyanine (CoPc), leads to facilitated transport by a hopping mechanism . Preethi et al studied the O 2 /N 2 separation performance of CoPc‐imidazole composite membranes and reported very high selectivity as well as permeability (as high as 56 for 40 wt % CoPc content).…”

Section: Literaturementioning

confidence: 99%

Some mechanistic insights into the action of facilitating agents on gas permeation through glassy polymeric membranes

Midda

Suresh

2017

AIChE Journal

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Incorporation of facilitating agents is one of the promising strategies being researched in recent years to cross the Robeson bounds for gas separations using polymeric membranes. The ways in which such inclusions modify the performance of membranes are not always clear. Here, we study the performance of two glassy membranes, Polyfurfuryl alcohol and Polysulfone, in O 2 /N 2 and CO 2 /N 2 separations, with Cobalt phthalocyanine in insoluble and solubilized forms as the facilitating agent. The results show that in general, three effects are important: (1) a barrier effect, (2) a facilitation effect, and (3) morphological effects on the polymer matrix due to an incompatibility between the particles and the polymer. These results provide some insight into the action of facilitating agents in soluble and insoluble form, when used as membrane additives.

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Enhanced stability and facilitation in oxygen transport through cobalt porphyrin polymer membranes

Cited by 28 publications

References 9 publications

Oxygen dissolution and transport in cobaltporphyrin‐bound organophosphazene membranes

Oxygen dissolution and transport in cobaltporphyrin‐bound organophosphazene membranes

Facilitated oxygen transport in a novel silicone polymer membrane containing carboxylic cobalt groups

Some mechanistic insights into the action of facilitating agents on gas permeation through glassy polymeric membranes

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