介质阻挡放电等离子体处理载体对CO甲烷化Ni/SiO2催化剂性能的改进

以经介质阻挡放电等离子体处理的SiO₂为载体,用浸渍法制备了Ni/SiO₂催化剂,并进行了CO甲烷化反应评价。与载体未经处理的常规Ni/SiO₂催化剂相比,载体经处理的催化剂在400℃下的CO与H₂转化率均提高了约6%,且在经700℃烧结6 h后,活性仍高于常规催化剂。XRD、TEM和H₂-TPR结果表明,载体经处理的催化剂,Ni颗粒粒径更小、粒径分布更集中,Ni与SiO₂之间的相互作用更强,证明等离子体处理使SiO₂更有利于促进Ni的分散。

Ni/SiO2 catalyst for CO methanation with support treated by dielectric barrier discharge plasma

Ni/SiO₂ catalyst was prepared for CO methanation using SiO₂ treated by dielectric barrier discharge plasma before impregnation.Compared with the conventional Ni/SiO₂ catalyst without the treatment, the CO and H₂ conversions at 400℃ were both approximately 6% higher for the support-treated catalyst.After the high temperature reaction at 700℃ for 6 h, the support-treated catalyst was still more active than conventional Ni/SiO₂ catalyst.XRD,TEM and H₂-TPR results showed that the support-treated catalyst had smaller Ni particle size and stronger interaction between Ni and SiO₂, which confirmed that plasma treatment made SiO₂ more favorable for Ni dispersion.