Reduction of NO with CO on CuO or Fe sub(2)O sub(3) catalysts supported on TiO sub(2) in the presence of O sub(2), SO sub(2) and water steam

• Published in: Fuel (Guildford) Vol. 118; pp. 137 - 147
• Main Authors: Sierra-Pereira, Cristiane Alves, Urquieta-Gonzalez, Ernesto Antonio
• Format: Journal Article
• Language: English
• Published: 15.02.2014
• Subjects: Carbon monoxide; Catalysis; CATALYSTS; COPPER OXIDE; CUPRIC OXIDE; OXIDES; Reduction; Stability; Titanium; TITANIUM DIOXIDE; WATER
• ISSN: 0016-2361
• DOI: 10.1016/j.fuel.2013.10.054

The activity for the reduction of NO with CO, selectivity to N sub(2) and the catalytic stability in the presence of O sub(2), water steam and SO sub(2) of Cu(II) or Fe(III) oxide catalysts supported on titania were studied. Data from XRD, H sub(2)-TPR, CO-TPR and UV sub(VIS)DRS evidenced the presence of well distributed octahedral Cu(II) and Fe(III) species in the studied xCu/Ti and xFe/Ti catalysts. TG/ATD results and Rietveld refinement of the XRD pattern of the 10Cu/Ti catalyst corroborated that, during calcination, copper oxide promotes the anatase transition to rutile, leading to a higher decrease in its specific surface area when compared to the 10Fe/Ti catalyst. Despite the high interaction between Fe(III) oxide and titania, verified from the H sub(2)TPR and CO-TPR profiles, Fe sub(2)O sub(3) catalysts were more active and selective to N sub(2) at temperatures lower than 450 [degrees]C than those based on CuO. Moreover, the iron (III) catalyst also showed higher stability in the presence of O sub(2), SO sub(2) and water steam at 500 [degrees]C. These results make Fe sub(2)O sub(3) catalysts supported on TiO sub(2) highly promising to be applied to the abatement of NOx emissions generated in combustion processes.