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Title: Perovskite-based adsorption process high-temperature gas separation application
Keywords: Perovskite oxides, vacancy creation,oxygen separation, sorption capacity.
Issue Date: 8-Feb-2007
Citation: SATHISHKUMAR GUNTUKA (2007-02-08). Perovskite-based adsorption process high-temperature gas separation application. ScholarBank@NUS Repository.
Abstract: Development of an adsorbent that will exclusively adsorb only oxygen (i.e., infinite selectivity) has the potential to significantly improve the economics of adsorption based air separation, which enjoys a significant market share for the production of oxygen and nitrogen from air. Perovskites, also known as ABO3 type mixed metal oxides (where A and B are metal ions) are historically known to produce high degree of oxygen deficiency in their structures at high temperature. There are indications that this property can be effectively utilized to develop the next generation, high temperature adsorbent for air separation with practically infinite oxygen selectivity. The present study was undertaken to examine the effects of A, B substitution on oxygen sorption and transport in perovskites. Thermogravimetric analysis was used to measure oxygen capacity and uptake rate at various temperatures and oxygen partial pressures, which are essential for assessing the potential for process development.Oxygen sorption equilibrium and sorption kinetics were studied in the temperature range 500-800 oC using oxygen-nitrogen mixture at atmospheric pressure with oxygen fraction varying from ~5-50%. Desorption kinetics was studied by allowing the equilibrated sample to desorb in pure nitrogen. In order to reconfirm the equilibrium and kinetic data obtained from Thermogravimetric analysis, and to better understand the performance of the perovskite type adsorbents under process conditions, breakthrough experiments in fixed beds were also conducted on the two promising samples at 500 0C. The results from two methods were consistent. A numerical simulation model was also developed that was able to capture the essential features of the measured column dynamics.
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