Carbon deposition properties and regeneration performance of La2NiO4 perovskite oxide for dry reforming of methane

Abstract

One of the key points in the development of dry reforming of methane (DRM) is the design of catalysts with high activity and stability. The reactivity and carbon deposition properties of La2NiO4 in DRM, as well as its regeneration performance, were studied. The results showed that the in-situ decomposition of La2NiO4 led to a more uniform distribution of smaller Ni0 particles on the La2O3 matrix compared with the directly loaded NiO/La2O3. A temperature-programmed test revealed that the breakthrough curve temperature for La2NiO4 in DRM was 618 °C. The carbon deposition would carry Ni0 metal away from the La2O3 matrix, making the solid carbon unable to be removed promptly due to insufficient oxygen supply, resulting in an increase in the catalyst's instantaneous carbon deposition rate at 650 °C and 750 °C. The regeneration tests showed that the samples' DRM performance and carbon deposition levels remained relatively stable before and after steam regeneration. However, air-regenerated samples exhibited a hysteresis time in DRM due to sintering. Additionally, CO2 was unable to completely remove carbon deposition from the samples, resulting in a significant increase in carbon deposition when regenerated samples were used for DRM.