Soot combustion with K/MgO as catalyst
(2006) Applied Catalysis A: General — Vol. 297, n° 2, p. 125-134 (2006)
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- The catalytic combustion of carbon black (CB), a model compound for soot, was studied in the presence of MgO and of KOH/MgO, the latter prepared by impregnation of MgO with an aqueous solution of KOH. The catalysts were characterized by atomic absorption spectroscopy, thermal programmed desorption, carbothermic reduction, X-ray photoelectron spectroscopy, diffuse reflectance FIF-infrared spectroscopy and X-ray diffraction. The addition of potassium to MgO shows significant catalytic activity for CB combustion. The role of potassium can be attributed to: (i) an important increase of oxygen concentration on the surface of the catalyst, (ii) an interaction between K and MgO which leads to a weakening of the Mg-O bonds, thus facilitating the formation and migration of oxygen species on the surface; this migration might be a rate-limiting step in the combustion and (iii) an easier decomposition of carbonates which takes place at lower temperature than on MgO. Furthermore, the KOH/MgO catalyst showed a high stability, as its activity was kept constant during isothermic cycles of CB combustion in air. (c) 2005 Elsevier B.V. All rights reserved.
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Jimenez, R., Garcia, X., Cellier, C., Ruiz, R., & Gordon, A. (2006). Soot combustion with K/MgO as catalyst. Applied Catalysis A: General, 297(2), 125-134. https://doi.org/10.1016/j.apcata.2005.08.042 (Original work published 2006)