Co-Ni/MgO 催化剂上低温甲烷二氧化碳干重整研究

The Ni/MgO and Co-Ni/MgO catalysts were prepared by sol-gel method, and the performance of the catalysts in the low-temperature dry reforming reaction of methane CO₂ was investigated. The results showed that the 1%Co-10%Ni/MgO catalysts possessed higher CH₄ and CO₂ conversions and the highest H₂/CO, and the CH4 and CO₂ conversions and H₂/CO of the catalysts were still higher than those of the Ni/MgO catalysts after 20 h of reaction at 450^◦C, and the carbon accumulation was 4.3% less than that of the Ni/MgO catalysts. The XRD, H₂-TPR, TEM, SEM, TG, and RAMAN characterization revealed that the addition of Co was beneficial to enhance the dispersion and particle size of the active components on the catalyst surface, reduce the clustering of catalyst particles, and inhibit the formation of carbon accumulation. By calculating the apparent activation energy of the reactants during the dry reforming reaction, it was found that the addition of moderate amount of Co could reduce the apparent activation energy of the reactants and improve the performance of Ni/MgO catalysts for low-temperature methane dry reforming reaction.