COMPOSITES BETWEEN SPINELS AND BINARY OXIDES AND THEIR SELECTIVE CATALYTIC REDUCTION ACTIVITY

The catalytic activity under selective catalytic reduction conditions for composites between the spinels MgAl2O4 or ZnAl2O4 and CuO are repo rted. It is shown that the conversion of NO into N-2 starts at about 2 50 degrees C and reaches a maximum value of about 30470 between 300 an d 500 degrees C. The conversion is highly selective and no formation o f N2O is observed. In absence of hydrocarbons as reducing agent the ac tivity is lost. The observed catalytic performance is explained by the well-known model for the selective catalytic reduction activity of Cu containing catalysts from Iwamoto et al. for Cu-ZSM-5. Thus, the cata lytic properties are determined more by the nature of the active centr es than by the nature of the support.