Copper-containing catalysts are activated, before use, by a reduction process where the presence of ZnO has a promoting effect. The present paper deals with 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 of the reduction reactions which involve the formation of the 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 of the reduction.
REDUCTION KINETICS OF CUO-ZNO / Annesini, Maria Cristina; Lavecchia, Roberto; L., Marrelli; Lojacono, Mariano; M. C., Campa; G., Fierro; Moretti, Giuliano; Porta, Piero. - In: SOLID STATE IONICS. - ISSN 0167-2738. - STAMPA. - 63-5:C(1993), pp. 281-288. (Intervento presentato al convegno 12TH INTERNATIONAL SYMP ON THE RELATIVITY OF SOLIDS tenutosi a MADRID, SPAIN nel SEP 24-30, 1992) [10.1016/0167-2738(93)90117-l].
REDUCTION KINETICS OF CUO-ZNO
ANNESINI, Maria Cristina;LAVECCHIA, Roberto;LOJACONO, Mariano;MORETTI, GIULIANO;PORTA, Piero
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 with 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 of the reduction reactions which involve the formation of the 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 of the reduction.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
