采用柠檬酸法制备了钙钛矿镍酸镧,并将其作为催化剂的前躯体用于二氧化碳甲烷化反应中。催化剂在400℃~700℃温度下反应气中进行活化处理。活化过程中生成了金属镍颗粒和碳酸氧化镧。金属镍呈高度分散状并被碳酸氧化镧包裹,这种现象有助于反应在400℃和500℃的高温下仍保持高活性和稳定性。XRD、XPS、TEM和H2-TPD等表征测试表明,在活化过程中生成的碳酸氧化镧对反应起到了至关重要的作用。 Perovskite lanthanum nickelate was prepared by citric acid method and used as the precursor of the catalyst for the carbon dioxide methanation reaction. The catalyst is activated at a temperature of 400-700 ° C. in the reaction gas. During the activation process, metallic nickel particles and lanthanum carbonate are formed. Nickel metal is highly dispersed and coated with lanthanum carbonate, a phenomenon that helps to maintain high activity and stability at 400 ° C and 500 ° C. XRD, XPS, TEM and H2-TPD characterization tests showed that the activated lanthanum carbonate generated during the reaction has played a crucial role.