负载型NiO-La_(2)O_(3)催化剂在CO_(2)甲烷化反应中的研究

Study on Supported Ni-La_(2)O_(3)Catalysts in CO_(2) Methanation Reaction

将二氧化碳转化为易于储存和运输的高热值燃料——甲烷,不仅可以缓解温室效应,也是解决能源短缺的有效途径。本文采用柠檬酸络合的等体积超声浸渍法制备一系列NiO-La_(2)O_(3)/SiO_(2)催化剂,其中镍和镧的摩尔比为1:1,并采用XRD、H_(2)-TPR表征技术对NiO-La_(2)O_(3)/SiO_(2)催化剂的结构和物化性质进行了研究。考察了NiO-La_(2)O_(3)的负载量对CO_(2)甲烷化反应性能的影响。结果表明,10%NiO-La_(2)O_(3)/SiO_(2)催化剂表现出最优的CO_(2)甲烷化反应性能,且在450℃时表现出最佳的反应活性,CO_(2)转化率和CH_(4)选择性分别为59.3%和60.8%。

Turning carbon dioxide into the methane,a high thermal value fuel to store and transport,not only alleviate the greenhouse effect,but also address energy shortages.A series of NiO-La_(2)O_(3)/SiO_(2)catalysts were prepared by equal volume ultrasonic impregnation with citric acid complexation,in which the molar ratio of nickel and lanthanum was 1:1,and the structure and physicochemical properties of NiO-La_(2)O_(3)/SiO_(2)catalysts were studied by XRD,H_(2)-TPR characterization technique.The effect of NiO-La_(2)O_(3)loading on CO_(2)methanation reaction was investigated.The results showed that the 10%NiO-La_(2)O_(3)/SiO_(2)catalyst was the optimal CO_(2)methanation reaction performance and showed the best reaction activity at 450℃,the CO_(2)conversion and CH_(4) selectivity were 59.3%and 60.8%,respectively.