Abstract
Chemical-looping combustion has been proposed as an alternative process for the complete elimination of CO2 emissions to the atmosphere in the combustion of carbonaceous products, such as natural gas. In this case, the combustion is a two-stage process. In the first stage, the structural oxygen contained in a reducible inorganic oxide is used for the combustion of the natural gas. In the second stage, the reduced oxygen carrier is regenerated with pure air to reinitiate a new combustion cycle. In this paper, nickel oxide supported on porous rutile is used as an oxygen carrier for the chemical-looping combustion of methane, as the main component of natural gas. The performance is assessed in 20-cycle tests in a fixed-bed reactor at 900 °C, using either dilute (20 vol % in N2) or pure methane for the reduction stage and pure air for the regeneration stage. The experimental results reveal that the reactions in the two involved processes are fast, as CO2, before breakthrough, is the only compound detected in ...
Published Version
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