CeO2 Nanorod@NiPhy Core‐shell Catalyst for Methane Dry Reforming: Effect of Simultaneous Sintering Prevention of CeO2 Support and Active Ni

Abstract

AbstractPreventing the sintering of nano‐catalyst is crucial to maintain their performance especially for high‐temperature reactions such as CO2 reforming of methane (DRM) reaction. In this paper, we design CeO2 nanorod@Ni phyllosilicate (CeO2@NiPhy) catalysts with different NiPhy shell thickness to simultaneously preserve the morphology of CeO2 nanorod and prevent the sintering of Ni. Compared with Ni/CeO2 supported catalyst, CeO2@NiPhy core‐shell catalyst with a shell thickness of 9 nm exhibits much better performance for DRM with stable CH4 and CO2 conversions of 75 % and 80 % respectively and lower carbon deposition due to high Ni sintering resistance and higher thermal stability of CeO2 during calcination and DRM reaction thereby higher oxygen vacancies concentration. In‐situ diffuse reflectance infrared Fourier transform spectra result demonstrates that DRM reaction takes place with a bi‐functional mechanism on CeO2@NiPhy. This design strategy can be applied to prepare other nano‐catalysts with high sintering resistance of both active metal and catalyst support for high‐temperature applications.