Temperature Dependence Study of Gas Permeability in Metal Doped Composite Polymeric Membranes
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Temperature Dependence Study of Gas Permeability in Metal Doped Composite Polymeric Membranes Yogesh Kumar Vijay, Anil Kumar Jain, Naveen Kumar Acharya, Kamlendra Awasthi, and Vaibhav Kulshrestha Department of Physics, University of Rajasthan, Jiapur, 9-10, Vigyan Bhawan, JAIPUR, 302004, India ABSTRACT Polycarbonate (PC) membrane and PC based hydrogen active intermetallic compound Fe0.5Ti0.5 particles doped composite membrane have been prepared by solution cast method. The membranes have been characterized by H2 and CO2 permeability and selectivity measurements with increasing temperature. Higher gas permeation has been observed with increasing temperature. In case of doped composite membrane H2/CO2 gas pair selectivity first increases then decreases with temperature whereas in case of pure PC it decreases with temperature. The effect of doping increases the activation energies for permeation of H2 and CO2 in the doped membrane in comparison to pure PC. Doping was found to suppress plasticization effect in polycarbonate. The doped membrane was analyzed by optical micrograph and XRF study.
INTRODUCTION Hydrogen separation from various gases is important in both refinery and chemical processing. There is an increase demand for hydrogen in renewable energy related applications such as clean fuel for vehicles and fuel cells [1]. Glassy polymers are widely used as gas barrier or as gas separation membranes because of their low cost, energy efficiency and easiness to mold in a desired shape. There widespread use in gas separation has however been limited by the difficulty of preparing membranes with the desired combination of high selectivity and permeability. It is unfortunate that as the selectivity of a polymer membrane increases, permeability invariably decreases and vice versa [2]. Many attempts have been made to overcome this fundamental limitation. The addition of micron- sized zeolite porous particles to organic polymers in the hope of combining the mechanical elasticity and processability of polymers with strong size selectivity characteristics of spatially well defined zeolite pores has been investigated. Commercialization of this approach has been hampered by poor polymer / zeolite adhesion and inadequate zeolite particle dispersion in a polymer [3]. Addition of fumed silica particles in glassy amorphous poly (4-methyl-2 pentyne) enhances both membrane permeability and selectivity for large organic molecules over small permanent gases [4]. The porous polymer beads of the chelate-resin-Fe (II) complex are quite useful as an adsorbent for nitrogen monoxide [5]. Thus the concentrated recovery or the removal of a trace amount of gas is successfully achieved when the appropriate chemical adsorbent is chosen. By forming polymer-metal complex, the active metals can be easily handled and attain the advantages of polymeric materials. Since the coordination of gaseous molecules to the metal complex is stronger than the physical adsorption or solubilization into polymers, the polymer metal complex provide h
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