Optimization of Ni-Based Catalysts for Dry Reforming of Methane via Alloy Design: A Review

The dry reforming of methane (DRM) reaction, which converts two greenhouse gases, CO2 and CH4, into valuable syngas, offers a promising route to carbon sequestration. Ni-based catalysts have been widely used for DRM due to the high activity, low cost, and high feasibility. Nevertheless, the rapid deactivation of Ni-based catalysts caused by carbon deposition and/or active metal sintering is the main drawback for large-scale application. In addition, its high energy demand poses additional difficulties due to the heat-absorbing nature of the reaction. The design of bimetallic alloy catalysts has been considered as an effective strategy to improve the activity and stability of Ni-based catalysts. This paper reviews recent advances in Ni-based bimetallic catalysts for DRM processes, which mainly focus on the synergistic effects of the two elements, the role of the second metal, and the reaction mechanism induced by different active species. Finally, the outlook for the development of high-performance catalysts for DRM is proposed. The discussions in the present work may provide helpful information to researchers in the CO2 conversion fields to optimize catalyst design.