Copper-containing catalysts are activated, before use, by a reduction process where the presence of ZnO has a promoting effect. The present paper deals wiith the kinetic behaviour of the reduction of the copper species in well defined specimens of CuO-ZnO. The effects of the temperature, hydrogen pressure and ZnO content on the consumption rate of hydrogen are analysed. A kinetic model is proposed which is consistent with the chemistry ofthe reduction reactions which involve the formation ofthe intermediate Cu+. The model appears to be able to describe the consumption rate of hydrogen and to account for the distribution of copper species in the course ofthe reduction.
REDUCTION KINETICS OF CuO-ZnO
CAMPA MC;FIERRO G;
1993
Abstract
Copper-containing catalysts are activated, before use, by a reduction process where the presence of ZnO has a promoting effect. The present paper deals wiith the kinetic behaviour of the reduction of the copper species in well defined specimens of CuO-ZnO. The effects of the temperature, hydrogen pressure and ZnO content on the consumption rate of hydrogen are analysed. A kinetic model is proposed which is consistent with the chemistry ofthe reduction reactions which involve the formation ofthe intermediate Cu+. The model appears to be able to describe the consumption rate of hydrogen and to account for the distribution of copper species in the course ofthe reduction.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
