Effect of sol-gel derived Al2O3-ZrO2 and Al2O3-TiO2 oxides on the selectivity of NO reduction by CO under oxidizing conditions

被引：0
|
作者：
Salvador Castillo
Ricardo Gómez
Marina Morán Pineda
机构：
[1] Instituto Mexicano del Petróleo,Dept. of Chem
[2] IM-FQG,undefined
[3] Eje Central Lázaro Cárdenas Instituto Politécnico Nacional,undefined
[4] ESIQIE 152,undefined
[5] Universidad Autónoma Metropolitana-I,undefined
来源：
Reaction Kinetics and Catalysis Letters | 2003年 / 79卷
关键词：
Sol-gel binary oxides; reduction of NO by CO; alumina-zirconia; platinum sol-gel catalysts; alumina-titania;
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学科分类号：
摘要：
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.
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页码：271 / 279
页数：8
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