Dry reforming of CH4 over NiCo/Ce0.75Zr0.25O2-δ: The effect of Co on the site activity and carbon pathways studied by transient techniques

The effects of cobalt in the CeZrO2-supported NiCo (3 wt%, Co/ :Ni=3/2) on the DRM at 750 degrees C were investigated by the transient method and use of O-18(2) and (CO2)-C-13. Transient kinetic rates of carbon deposition and gasification by the support's oxygen, TOF (s(-1)) and concentration of active carbon were determined. Higher TOF and reduced carbon accumulation rates were measured on NiCo than Ni at the initial stage of reaction. However, oxidation of Co with time-on-stream led to lower and higher concentration of active metal sites and deposited carbon, respectively. These results appear important for catalyst design improvements (e.g. metal alloy composition).

Automated summary

The effects of cobalt in NiCo supported by CeZrO2 on DRM at 750 degrees C were studied using transient methods and isotopes. NiCo showed higher catalytic activity and lower carbon accumulation rates compared to Ni at the initial reaction stage. However, oxidation of cobalt over time resulted in decreased active metal site concentration and increased carbon deposition.