Syngas Chemical Looping: Influence of Supports on Oxygen Carrier Performance
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Date
2011-06
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The Ohio State University
Abstract
Syngas Chemical Looping (SCL) is a cost effective reforming technology for production of concentrated, high purity hydrogen with in-situ CO¬¬2 capture. One of the crucial parts of SCL technology is the selection of Oxygen Carrier (OC). OC refers to the composite particles used in the SCL process to indirectly transfer the oxygen to the fuel gas from H2O and/or air through reduction and oxidation reactions. Iron oxide is suited for the SCL process due to its low material cost, favorable thermodynamics for hydrogen generation, strength and high oxygen carrying capacity. However, pure iron oxide is not a good OC; various support materials need to be added to improve reactivity and recyclability of the OC. To explore the most suitable OC which will make the SCL more efficient and more economically feasible, we investigated the properties (reactivity, recyclability and strength) by testing different variations of the OC particles. Iron oxide and various ceramic supports were homogeneously mixed, pelletized and sintered. For reactivity and recyclability tests, the selected pellets are placed in a ThermoGravimetric Analyzer (TGA) to participate in multiple redox reactions using balancing H2, N2 and Air. For the strength test, the pellets are crushed using a SHIMPO FGV-100X strength analyzer. A Fix Bed setup tested the particles’ physical integrity and structural change. Both the support and concentration of support have a strong and direct influence on the reactivity, recyclability and strength of the OC particles. From the current experimental data, Titanium and Magnesium supports enhance the lifetime of the OC by providing stable redox performance. To identify the optimal OC, more tests need to be done and an OC that can perform well for 100 redox cycles can be synthesized. The OC has a direct influence on the performance and economical feasibility of the SCL process. The optimum OC will maximize the efficiency of this advanced combustion of Syngas (CO+H2) and enhance in-situ CO2 sequestration, which can potentially solve the global warming issue associated with fossil fuel utilization.
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16th OSU Denmen Undergraduate Research, 3rd Place, Engineering Category
2010-2011 William G. Lowrie Chemical & Biomolecular Engineering Deaprtment, Outstanding Undergraduate Reseach
2010-2011 William G. Lowrie Chemical & Biomolecular Engineering Deaprtment, Outstanding Undergraduate Reseach
Keywords
Syngas Chemical Looping, Oxygen Carrier, Support