A low temperature organic synthesis of monodispersed NiRu nanocrystals for CO₂ methanation

In this study, monodispersed NiRu nanocrystals with a diameter of 3 nm were synthesized at 90 °C via a tuning hot-inject method to lower the temperature of the organic phase synthesis of monodispersed nanomaterials. The key factor for the nanocrystalline formation of NiRu alloy nanocrystals was summarized in detail. Simultaneously, the synergistic effect of Ni and Ru in CO₂ methanation was explored. Doping trace Ru can significantly improve the conversion rate of CO₂ methanation and CH₄ selectivity. The underlying mechanism was studied in detail via X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), temperature-programmed hydrogen reduction (H₂-TPR) and desorption (H₂-TPD) tests, and temperature-programmed desorption of CO₂ (CO₂-TPD). This study gives out a new way for the general synthesis of monodisperse nickel-based nanocrystals and provides a reference for the development and application of monodispersed nanoparticles for CO₂ methanation.