RuNi双活性组分负载型TiO_(2)催化CO_(2)甲烷化反应研究

RuNi dual active components supported TiO catalyst for CO methanation

采用共沉淀法制备了一种RuNi双金属负载型催化剂(RuNi/TiO_(2)),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/TiO_(2)催化剂对CO_(2)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TiO_(2)催化剂,双金属负载显著提高了其催化活性,CO_(2)转化率达到了80%以上,甲烷选择性接近100%,且RuNi/TiO_(2)催化时反应速率达到了0.55 mol CO_(2)/(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CO_(2)甲烷化反应机制。

RuNi bimetallic supported catalyst(RuNi/TiO_(2))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/TiO_(2)catalyst for CO_(2)methanation is investigated.Results show that the bimetallic supported catalyst shows a significant higher catalytic activity than Ruor Ni single-component supported TiO_(2)catalyst.CO_(2)conversion rate over RuNi/TiO_(2)catalyst exceeds 80%,methane selection closes to 100%,and the reaction speed reaches0.55 mol CO_(2)(g Ru)-1·h-1.Reaction temperature,RuNi loading amount and other reaction conditions are also optimized.Furthermore,the mechanism of CO_(2)methanation under UV irradiation with H2O as the reducing agent is explored through in-situ Fourier infrared spectroscopy.