Active Exsolved Metal–Oxide Interfaces in Porous Single‐Crystalline Ceria Monoliths for Efficient and Durable CH4/CO2 Reforming. Issue 1 (23rd November 2021)

• Record Type: Journal Article
• Authors: Xiao, Yongchun; Xie, Kui
• Is Part Of: Angewandte Chemie international edition. Volume 61:Issue 1(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-11-23
• Subjects: ceria -- dry reforming -- exsolution -- metal–oxide interfaces -- porous single crystals; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.202113079
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: Dry reforming of CH4 /CO2 provides an attractive route to convert greenhouse gas into syngas; however, the resistance to sintering and coking of catalyst remains a fundamental challenge at high operation temperatures. Here we create active and durable metal–oxide interfaces in porous single‐crystalline (PSC) CeO2 monoliths with in situ exsolved single‐crystalline (SC) Ni particles and show efficient dry reforming of CH4 /CO2 at temperatures as low as 450 °C. We show the excellent and durable performance with ≈20 % of CH4 conversion and ≈30 % of CO2 conversion even in a continuous operation of 240 hours. The well‐defined active metal–oxide interfaces, created by exsolving SC Ni nanoparticles from PSC Ni x Ce1− x O2 to anchor them on PSC CeO2 scaffolds, prevent nanoparticle sintering and enhance the coking resistance due to the stronger metal–support interactions. Our work would enable an industrially and economically viable path for carbon reclamation, and the technique of creating active and durable metal–oxide interfaces in PSC monoliths could lead to stable catalyst designs for many challenging reactions. Abstract : Here we created active metal–oxide interfaces in porous single‐crystalline CeO2 monoliths with in situ exsolved single‐crystalline Ni nanoparticles and show efficient and durable CH4 /CO2 reforming at a relatively low temperature of 450 °C.