The activity of Au/γ-Al2O3 catalysts for NO reduction by propene was studied in the presence of 1.5 % H2O and 4.7 % O2. The behavior of the catalysts prepared using different procedure could be classified into three groups. Group A catalysts were active in N2 production below 673 K. They contained aggregates of small grains of Au. Group B catalysts were active above 673 K. They contained large Au crystallites. On these catalysts, the Al2O3 support contributed substantially to the observed catalytic activity. Group C catalysts were not very active for N2 production, but were the most active for propene combustion. They contained small grains of Au highly dispersed on Al2O3. It was established that the oxidation of NO to NO2 was not important in NO reduction over catalysts effective for N2 formation.
ASJC Scopus subject areas
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry