Synthesis gas production from CO2 reforming of methane over Ni–Ce/SiO2 catalyst: The effect of calcination ambience

Ni–Ce/SiO2 catalysts were prepared by calcination under Ar, CO2, O2 and H2 ambience, and applied in CO2 reforming of methane for synthesis gas production. BET, XRD, XPS, TPR, SEM, TEM and TPH techniques were employed to characterize the fresh and used catalysts. Highly dispersed nickel oxides bearing stronger interaction with SiO2 prevented the metal sintering. The formation of reactive carbon species on Ni–Ce/SiO2 catalyst calcined under Ar ambience effectively promoted the carbon elimination and kept the catalyst more stable. Nevertheless, the oxygen storage capacity of CeO2 might partly lose on Ni–Ce/SiO2 calcined under H2 ambience. As a result, the inhibition of carbon elimination and the deposition of inert carbon were responsible for its partial deactivation.

Graphical abstractNi–Ce/SiO2 catalyst calcined under Ar ambience exhibited higher metal dispersion and stronger metal–support interaction. Moreover, the formation of reactive carbonaceous species effectively improved the carbon elimination, keeping the catalyst more stable.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Ni–Ce/SiO2 catalyst calcined under Ar ambience exhibited good stability. ► Highly dispersed NiO bearing strong interaction with SiO2 inhibited the sintering. ► The formation of reactive carbonaceous species facilitated the carbon elimination. ► The loss of oxygen storage capacity of CeO2 led to the deactivation of Ni–Ce–H2.