Dry Reforming of CH₄/CO₂by Stable Ni Nanocrystals on Porous Single‐Crystalline MgO Monoliths at Reduced Temperature

Abstract

Dry reforming of CH4/CO2 provides a promising and economically feasible route for the large‐scale carbon fixation; however, the coking and sintering of catalysts remain a fundamental challenge. Here we stabilize single‐crystalline Ni nanoparticles at the surface of porous single‐crystalline MgO monoliths and show the quantitative production of syngas from dry reforming of CH4/CO2. We show the complete conversion of CH4/CO2 even only at 700 °C with excellent performance durability after a continuous operation of 500 hours. The well‐defined and catalytically active Ni‐MgO interfaces facilitate the reforming reaction and enhance the coking resistance. Our findings would enable an industrially and economically viable path for carbon reclamation, and the “Nanocrystal On Porous Single‐crystalline Monoliths” technique could lead to stable catalyst designs for many challenging reactions.

Engineering exsolved catalysts for CO2 conversion

“…In this, the desirable active sites are incorporated in a inorganic matrix (i.e., perovskite or pyrochlore oxide) under oxidizing conditions and are subsequently segregated on the surface of the oxide, which now acts as a support, under reducing atmosphere in the form of metallic nanoparticles (Pakhare and Spivey, 2014;Kousi et al, 2021;le Saché et al, 2018;Tang et al, 2019). As these particles are formed from within the support in a disassembly method, they are socketed, thus strained, and crystallographically aligned with the support which endows them with many interesting properties such as thermal stability, coke resistance and high activity (Zhao et al, 2021;Kim et al, 2021;Cheng et al, 2021).…”

In situ construction of hetero-structured perovskite composites with exsolved Fe and Cu metallic nanoparticles as efficient CO2 reduction electrocatalysts for high performance solid oxide electrolysis cells

“…In addition to the use of renewable energy sources as replacement for fossil fuels, CO 2 capture and utilization has become another promising alternative. 2–4 Solid oxide electrolysis cells (SOECs) are ideal for this because they are the most efficient devices for converting CO 2 into usable compounds, such as CO with theoretically energy conversion efficiencies close to 100% utilizing clean and sustainable alternative energy sources. 5–8…”