METHANOL STEAM REFORMING OVER Cu/CeO_2 CATALYSTS. INFLUENCE OF ZINC ADDITION

摘要

Methanol steam reforming reaction was studied over Cu(5 wt%)/CeO_2 with and without the presence of Zn The Zn addition decreased the Cu~(+2) reducibility and increased the oxygen mobility of ceria. The main products were CO_2 and H_2 with small amount of CO. Selectivity to CO decreased with the Zn addition and it was lower at lower reaction temperatures and lower space velocities. At 230°C and W/F_(MeOH)= 648g min mol~(-1)selectivities to H_2 and to CO_2 were 100% on Zn/Cu/Ce. The catalytic results indicated that CO was mainly a secondary product formed from reverse water gas shift reaction.