Reduction of NO with CO on CuO or Fe2O3 catalysts supported on TiO2 in the presence of O-2, SO2 and water steam

Autor(es)

Sierra-Pereira, Cristiane Alves ^[1] ; Urquieta-Gonzalez, Ernesto Antonio ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Chem Engn, Catalysis Lab, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: FUEL; v. 118, p. 137-147, FEB 2014.
• Citações Web of Science: 25

Resumo

The activity for the reduction of NO with CO, selectivity to N-2 and the catalytic stability in the presence of O-2, water steam and SO2 of Cu(II) or Fe(III) oxide catalysts supported on titania were studied. Data from XRD, H-2-TPR, CO-TPR and UVVISDRS 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-2-TPR and CO-TPR profiles, Fe2O3 catalysts were more active and selective to N-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-2, SO2 and water steam at 500 degrees C. These results make Fe2O3 catalysts supported on TiO2 highly promising to be applied to the abatement of NOx emissions generated in combustion processes. (C) 2013 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 09/51700-7 - Catalisadores de CuO, Fe2O3 ou CO3O4 suportados em TiO2, CeO2 ou ZrO2: preparação via sol-gel in situ ou impregnação e avaliação na redução de NO com CO
• Beneficiário: Cristiane Alves Pereira
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto