反应气中活化后的镍酸镧用于二氧化碳加氢生成甲烷(英文)  

Methanation of carbon dioxide over the LaNiO_3 perovskite catalysts activated under the reactant stream

作　　者：高敬[1,2] 贾立山[1,2] 方维平[3] 李清彪[1,2] 宋浩[1,2] 

机构地区：[1]厦门大学化学化工学院化学工程与生物工程系,福建厦门361005 [2]醇醚酯化清洁生产国家工程实验室,福建厦门361005 [3]厦门大学化学化工学院化学系,福建厦门361005

出　　处：《燃料化学学报》2009年第5期573-577,共5页Journal of Fuel Chemistry and Technology

基　　金：National Engineering Laboratory for Green Chemical Productions of Alcohols,Ethers and Esters and State Key Laboratory for Physical Chemistry of Solid Surface of Xiamen University

摘　　要：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。In this study, LaNiO3 perovskite catalysts were prepared by citrate method and used for carbon dioxide （CO2） methanation. The catalysts were activated at different temperatures （400℃-700℃） under the reactant stream. The activation led to the formation of small metallic nickel particles and hexagonal lanthanum oxocarbonate （La2O2CO3）. Ni^0 was highly dispersed and enveloped by La2O2CO3, which was responsible for the high catalytic activity and stability of the LaNiO3 perovskite catalysts even at high temperature （400℃-500℃）. The X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, and HE-temperature- programmed desorption measurements illustrated that La2O2CO3 generated from the activation might play an important role in the mcthanation of CO2.

关 键 词：镍酸镧 钙钛矿 二氧化碳甲烷化 活化 碳酸氧化镧 

分 类 号：TQ530.2[化学工程—煤化学工程]