采用共沉淀法制备了一种RuNi双金属负载型催化剂（RuNi/TiO₂），通过XRD、BET、TEM及H₂-TPR表征确定了催化剂的组成及还原性质。考察了RuNi/TiO₂催化剂对CO₂甲烷化反应活性的影响，并对反应温度、RuNi负载量等反应条件进行了优化。结果表明，相较Ru或Ni单组分负载的TiO₂催化剂，双金属负载显著提高了其催化活性，CO₂转化率达到了80%以上，甲烷选择性接近100%，且RuNi/TiO₂催化时反应速率达到了0.55 mol CO₂/（g Ru）·h。同时，通过原位傅里叶红外光谱探究了以H₂O为还原剂时紫外光照射条件下CO₂甲烷化反应机制。

RuNi bimetallic supported catalyst (RuNi/TiO₂) is prepared by co-precipitation method.The composition and reduction properties of the catalyst are determined by XRD,BET,TEM and H₂-TPR characterizations,and the catalytic activity of RuNi/TiO₂ catalyst for CO₂ methanation is investigated.Results show that the bimetallic supported catalyst shows a significant higher catalytic activity than Ru or Ni single-component supported TiO₂ catalyst.CO₂ conversion rate over RuNi/TiO₂ catalyst exceeds 80%,methane selection closes to 100%,and the reaction speed reaches 0.55 mol CO₂ (g Ru)^-1·h^-1.Reaction temperature,RuNi loading amount and other reaction conditions are also optimized.Furthermore,the mechanism of CO₂ methanation under UV irradiation with H₂O as the reducing agent is explored through in-situ Fourier infrared spectroscopy.

郭艳(1984-),女,硕士,助理工程师,研究方向为光谱学表征分析,guoyan@licp.cas.cn