Hydrogen production through combined dry reforming and partial oxidation of methane over the Ni/Al2O3–CeO2 catalysts.

The study aimed to explore synergies resulting from the combination of dry reforming and partial oxidation of methane, using 10%Ni/Al 2 O 3 –CeO 2 catalysts with varying CeO 2 proportions (10, 30, 50, and 70 wt%). The manufacturing involved mechanochemical and impregnation methods for supports and catalysts, respectively. The inclusion of 10 wt% CeO 2 played a crucial role in enhancing nickel dispersion and reinforcing interaction with the support. Particularly noteworthy was the exceptional performance of the 10%Ni/Al 2 O 3 –10%CeO 2 catalyst, achieving an impressive 83% methane conversion at 700 °C, surpassing other prepared nickel-based catalysts. The introduction of a small quantity of O 2 during methane dry reforming, inferred from TPO and FESEM analyses, effectively mitigated carbon deposition. Demonstrating remarkable endurance, the catalyst 10%Ni/Al 2 O 3 –10%CeO 2 maintained efficacy for 440 min at 700 °C, yielding CH 4 and CO 2 conversion rates of 93% and 34%, respectively. Higher calcination temperatures led to nickel particle aggregation, causing a decline in catalytic efficiency. • Dry reforming and partial oxidation of methane were done on Ni/Al 2 O 3 –CeO 2 catalyst. • The Ni/Al 2 O 3 –10CeO 2 possessed the best efficacy among the investigated samples. • Introducing oxygen during reforming significantly reduced carbon formation. • Higher reduction temperature boosts stability and performance. • Higher T calcination reduces BET area, lowering performance via particle sintering. [ABSTRACT FROM AUTHOR]