Regenerable MgO promoted metal oxide oxygen carriers for chemical looping combustion
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United States of America Patent
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Aug 19, 2014
Grant Date -
Nov 28, 2013
app pub date -
May 22, 2012
filing date -
May 22, 2012
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Abstract
The disclosure provides an oxygen carrier comprised of a plurality of metal oxide particles in contact with a plurality of MgO promoter particles. The MgO promoter particles increase the reaction rate and oxygen utilization of the metal oxide when contacting with a gaseous hydrocarbon at a temperature greater than about 725° C. The promoted oxide solid is generally comprised of less than about 25 wt. % MgO, and may be prepared by physical mixing, incipient wetness impregnation, or other methods known in the art. The oxygen carrier exhibits a crystalline structure of the metal oxide and a crystalline structure of MgO under XRD crystallography, and retains these crystalline structures over subsequent redox cycles. In an embodiment, the metal oxide is Fe2O3, and the gaseous hydrocarbon is comprised of methane.
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