Cu-Al-O system: Catalytic Coatings Obtained by the Activated Thermo-Chemical Condensate Deposition Method

  • Kazys BABILIUS, Artūras BABILIUS∗ Kaunas University of Technology
Keywords: coatings, nanocrystalline, Cu-Al-O, γ-Al2O3, adhesion, resistance to acids, morphology, X-ray diffraction, crystallite size, CO and NO catalysts.

Abstract

Cu-Al-O type catalytic coatings of controlled thickness were obtained by the activated thermo-chemical condensate
deposition method (AT-CCD), without formation of metal underlayer, straight on the strip steel OC-404 of 40 μm
thickness, which temperature did not exceed 250 °C during coating formation.
After thermal treatment, following investigations of the system “coating-substrate” were made: adhesion, resistance
to chemical effect in acids, phase composition, size of crystallites, morphology and elemental composition of the
surface.
Given catalyst assessment temperature up to 275 °C, relatively small gas flows Qgas = 0.5 l/min and large oxygen
amount O2 = 20 %, the catalyst (CO oxidation) begins to operate at T5 = 75 °C, reaches 50 % conversation at
T50 = 140 °C, and maximum conversion is obtained at 250 °C.
Given catalyst assessment temperature up to 600 °C, relatively big gas flows Qgas = 2.75 l/min and small oxygen
amount O2 = 0.2 %, the catalyst begins to operate at T5 = 220 °C, reaches 50 % conversation at T50 = 300 °C. Maximum
conversion – CO = 92 % and NOx = 100 % – is obtained at 400 °C.

Published
2008-03-11
Section
METALS, ALLOYS, COATINGS