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1 Polish Journal of Chemical Technology

1 2005

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Microstructured cobalt catalyst for VOC combustion. Preparation of active Catalytic Surface

Łojewska J., Kołodziej A., Dynarowicz-Łątka P., Wesełucha-Birczyńska A.

Polish Journal of Chemical Technology

2005

Vol. 7, nr 2

31-39

VOC combustion is a demanding process for both reactor and catalyst design. The microstructural reactor based on the wire gauze was regarded as an alternative to ceramic monoliths comparing their heat and mass transfer coefficients. Chromium-aluminum (CrAl) and chromium-nickel steel were surveyed in terms of their applicability for carrier manufacturing and catalyst depositing. The alumina washcoat and cobalt catalyst were deposited as organic precursors using the Langmuir-Blodgett method (LB) which allows to control the amount of the deposited metal. The carriers were characterized at various stages of the preparation by SEM/EDX, XPS, RM methods and tested in n-hexane combustion. Oxidation of the Al washcoat precursor led to the gamma-Al2O3 formation improving the properties of the Al2O3 layer developed on the precalcined CrAl carrier. Oxidation of cobalt stearate deposited on the CrAl gave cobalt oxide, which was assigned to the dispersed spinel Co3O4. The activation energy for the obtained cobalt catalyst (47 kJ/mol) was twice as low as for a standard Pt/Al2O3 catalyst.