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Soot combustion with K/MgO as catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
44277 46013 2006 10 PDF Available
Title
Soot combustion with K/MgO as catalyst
Abstract

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 FT-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 MgO 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.

Keywords
Soot; Catalytic combustion; Potassium; Mechanisms
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 297, Issue 2, 6 January 2006, Pages 125–134
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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