Abstract
Nickel catalysts supported over ZnAl 2O 4 modified by Ce or/and Zr addition were studied in the steam reforming of ethanol under more severe reaction conditions such as a lower extent of feed dilution and lower space velocities. The catalysts were stable at 650 °C during 35 h in time on stream. The main reaction products were H 2, CO 2, CO, C 2H 4O and small amounts of CH 4 and C 2H 4. The catalyst supported over CeO 2–ZnAl 2O 4 was the most active and showed the highest hydrogen selectivity. The addition of ZrO 2 decreased the activity and favored the CO production. The lowest degree of Ni 2+ reduction over Ni/ZAZr could explain the worst performance of this system. Otherwise, the highest Ni 2+ dispersion and the high oxygen mobility from ceria or from Ni–Ce boundary allowed a higher residual activity and an improved coking resistance.
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