Gas separation membranes containing Re6Se8(MeCN)6 2+ cluster-supported cobalt-porphyrin complexes

Abstract

Cellulose nitrate (CN) composite membranes, containing cobalt porphyrin (CoP) complexes self-assembled within nanometer-sized rhenium clusters (ReCoP), have been prepared and their oxygen and nitrogen gas permeabilities were analyzed. The solubility of ReCoP and the characteristics of the corresponding composite membranes were analyzed using a Cahn microbalance, FT-IR spectroscopy, wide-angle X-ray scattering, and differential scanning calorimetry. The nitrogen permeability through the CN composite membranes decreased upon addition of ReCoP and CoP, which implies that the presence of these oxygen carrier complexes affects the structure of the polymer matrix. The oxygen permeability through the composite membranes containing small quantities of ReCoP decreased, but it increased upon increasing the concentration. The oxygen gas transport was affected by the matrix at low ReCoP concentrations, but higher concentrations of ReCoP increased the oxygen permeability as a result of its reversible and specific interactions with oxygen, effectively realizing ReCoP carrier-mediated oxygen transport.

Preparation and characterization of an amino‐cellulose (AC) derivative for development of thin‐film composite membrane for CO2/CH4 separation

“…Numerous derivatives of cellulose with variety of functional groups for various purposes have been prepared . In the gas separation field, some cellulose derivatives such as cellulose acetate , ethyl cellulose , and cellulose nitrate have been used. By the way, since no amino or other basic groups are existing in the structure of cellulose; thus, unmodified cellulose cannot act as a CO 2 carrier.…”