Strong electrostatic adsorption sequence of Ni and Co affects low temperature dry reforming performance over NiCo/MgAlOx/ZrO2
Document Type
Article
Publication Date
6-5-2025
Abstract
In bimetallic catalysts, the synergistic interactions between the metals and the support are crucial for catalytic performance, especially when supported on low-dimensional materials like metal oxide rafts. This study investigates the effect of the impregnation sequence of Ni and Co on the formation of bimetallic NiCo alloy catalysts and their impact on the dry reforming of methane (DRM) activity. We show that on reducible supports, the process of metal adsorption is governed by the metal-support interactions (MSI) and the synthesis sequence, which in turn affects low-temperature DRM catalysis. Using a MgAlOx/ZrO2 hierarchical support, we observed dramatic changes in DRM activity, achieving a minimum at 534 °C and 240 Lgcat⁻¹h⁻¹, compared to 696 °C and 48 Lgcat⁻¹h⁻¹ in the control. The study employs XANES/XAFS, XPS, HAADF-STEM-EDS, and H2-TPR to reveal that NiCo alloy nanoparticle formation and Ni/Co molar ratio depend on impregnation order, correlating changes in catalyst properties with performance and MSI levels.
Publication Source (Journal or Book title)
Applied Catalysis B: Environmental
Recommended Citation
Wang, J., Lucas, J., Nakashima, H., Ogino, I., Dooley, K., & Gazit, O. (2025). Strong electrostatic adsorption sequence of Ni and Co affects low temperature dry reforming performance over NiCo/MgAlOx/ZrO2. Applied Catalysis B: Environmental, 366 https://doi.org/10.1016/j.apcatb.2024.125004