Cordierite as catalyst support for nanocrystalline CuO/Fe2O3 system

摘要: Abstract CuO, Fe 2 O 3 and CuO–Fe samples supported on cordierite (commercial grade) were prepared by wet impregnation method using finely powdered support material, copper and/or iron nitrates. The extent of loading was varied between 5 20 wt.% or . physicochemical, surface catalytic properties the various solids calcined at 350–700 °C investigated XRD, EDX, nitrogen adsorption 77 K CO-oxidation 220–280 °C. results obtained revealed that employed preheated well-crystallized magnesium aluminum silicate (Mg Al 4 Si 18 ). Loading CuO 350 °C led to a partial dissolution added oxides in lattice forming solid solutions. other portions remained as separate nanocrystalline phases. dissolved transition metal oxide increased upon increasing calcination temperature from 350 500 °C. followed resulted solid–solid interaction some yielding cuprate , which decomposed ≥500 °C oxides. portion 500 °C is twice CuO. S BET several times treating with small amounts increase more pronounced activity progressively amount oxide(s) added. mixed system showed activities much bigger than those measured for individual systems. synergistic effect manifested case attributed formation cuprate. significant concentration species top layers treated mixtures ferric could be responsible catalysts 500 700 °C.