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Synthetic coal chars for the elucidation of NO heterogeneous reduction mechanisms

AuthorsPevida García, Covadonga ; Arenillas de la Puente, Ana ; Rubiera González, Fernando ; Pis Martínez, José Juan
KeywordsNO heterogeneous reduction
Coal char
Isotopically labelled NO
Issue DateJan-2007
CitationFuel 86(1-2): 41-49 (2007)
AbstractIn the present work, the mechanisms involved in NO–char heterogeneous reduction have been studied using a synthetic coal char (SC char) as carbon source. Another synthetic char (SN char) without nitrogen in its composition has also been employed in these studies. Isothermal reduction tests at different temperatures have been carried out. Two temperature regimes were considered: low temperature (T < 250°C) where NO chemisorption takes place and high temperature (T > 250°C) where NO–C reaction occurs. Step response experiments combining consecutive reaction stages with NO and 15NO were performed in order to determine the role of nitrogen surface complexes, C(N), in the reduction process. The results revealed N2 and CO2 to be the main reduction products under the experimental conditions employed in this work. NO chemisorption at lower temperatures results in N2 emission and surface complexes (mainly oxygenated) formation, while char gasification by NO involves a direct NO attack on the char surface to form surface complexes. As a consequence of desorption of these complexes new sites of reaction are created.
Description9 pages, 6 figures, 1 table.-- Available online 14 August 2006.
Publisher version (URL)http://dx.doi.org/10.1016/j.fuel.2006.07.002
Appears in Collections:(INCAR) Artículos
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