(422d) From CO2 to Syngas: CuNi/La2O3 As a High-Performance Catalyst for Dry Reforming of Methane

The catalytic behavior of Ni/La₂O₃ and CuNi/La₂O₃ catalysts was examined for dry reforming of methane (DRM), with a focus on enhancing reducibility, stability, and resistance to carbon deposition. Incorporation of Cu effectively lowered the Ni reduction temperature, as shown by TPR, due to enhanced hydrogen spillover and the formation of oxygen vacancies. XPS analysis confirmed that Cu stabilizes the oxygen lattice, suppresses carbonate accumulation, and promotes CO₂ activation. At 850 °C, CuNi/La₂O₃ achieved 78% CH₄ conversion and 96% CO₂ conversion, significantly higher than the 55% and 72% obtained with Ni/La₂O₃. Structural characterization (XRD and FESEM) revealed that Cu inhibits Ni sintering, maintaining high dispersion. Although total carbon deposition was slightly higher for CuNi/La₂O₃ (0.50 wt.%) compared to Ni/La₂O₃ (0.42 wt.%), a 40% reduction in graphitic carbon was observed, indicating easier carbon removal. The synergistic effect between Cu and Ni enhanced metal dispersion, modulated electronic properties, and weakened Ni–La₂O₃ interactions, leading to improved CH₄ activation and coke suppression. CuNi/La₂O₃ exhibited excellent activity, stability, and resistance to deactivation. When compared with other DRM catalytic systems, this catalyst demonstrated superior and competitive performance, positioning it as a promising candidate for efficient and durable syngas production.

Acknowledgement: This publication was made possible by the NPRP grant (NPRP14S-0302-210011) from the Qatar National Research Fund (a member of Qatar Foundation). The statements made herein are solely the responsibility of author(s).