Effect of sol-gel derived Al2O3-ZrO2 and Al2O3-TiO2 oxides on the selectivity of NO reduction by CO under oxidizing conditions |
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| Authors: | Salvador Castillo Ricardo Gómez Marina Morán Pineda |
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| Affiliation: | (1) Instituto Mexicano del Petróleo, IM-FQG, Eje Central Lázaro Cárdenas Instituto Politécnico Nacional, ESIQIE 152, Edif. 7, Unidad Profesional Adolfo López Mateos, 07738, México, D.F;(2) Dept. of Chem, Universidad Autónoma Metropolitana-I, A.P. 55-534, México D.F., 09340 |
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| Abstract: | The role of Al2O3-ZrO2 and Al2O3-TiO2 sol-gel prepared supports in the activity of platinum for the NO reduction by CO under oxidizing conditions has been studied. 27Al MAS-NMR spectra have shown the formation of pentacoordinate AlV in alumina-zirconia support. ZrO2 or TiO2 crystalline phases cannot be identified by XRD diffraction, suggesting the formation of nanosized structures supported on alumina. When the reaction was carried out in presence of oxygen, large amounts of NO2 were observed on Pt/Al2O3-ZrO2catalyst, while the formation of N2O is more prononced on Pt/Al2O3-TiO2 catalyst. The effect of water during NO reduction is discussed. This revised version was published online in June 2006 with corrections to the Cover Date. |
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| Keywords: | Sol-gel binary oxides reduction of NO by CO alumina-zirconia platinum sol-gel catalysts alumina-titania |
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