• Payne, David J.
• Kousi, Kalliopi
• Neagu, Dragos
• Metcalfe, Ian S.
• Papaioannou, Evangelos I.
• Kerherve, Gwilherm
• Calì, Eleonora
• Bekris, Leonidas

Abstract

Lowering the temperature at which CH4 is converted to useful products has been long-sought in energy conversion applications. Selective conversion to syngas is additionally desirable. Generally, most of the current CH4 activation processes operate at temperatures between 600 and 900 °C when non-noble metal systems are used. These temperatures can be even higher for redox processes where a gas phase–solid reaction must occur. Here we employ the endogenous-exsolution concept to create a perovskite oxide with surface and embedded metal nanoparticles able to activate methane at temperatures as low as 450 °C in a cyclic redox process. We achieve this by using a non-noble, Co–Ni-based system with tailored nano- and micro-structure. The materials designed and prepared in this study demonstrate long-term stability and resistance to deactivation mechanisms while still being selective when applied for chemical looping partial oxidation of methane.

Topics

• nanoparticle
• perovskite
• impedance spectroscopy
• surface
• activation
• gas phase