【摘要】 采用硝酸盐共分解法制备稀土改性固体氧化物燃料电池阳极催化材料NiOxREyOz。用X射线衍射(XRD)、程序升温还原(TPR)、扫描电镜(SEM)等表征手段考察了材料的物理化学性质。XRD结果表明,添加镧在800℃即会与氧化镍发生反应,而镨则在1400℃与氧化镍发生反应,钐和钆则在两种情况下都没有与氧化镍发生反应。通过添加稀土材料改性,大大降低了氧化镍的粒径,新型催化材料中氧化镍的还原峰向低温方向移动,而添加的稀土材料与氧化镍相互作用,形成一个温度较高的还原峰。结果表明,添加的稀土材料通过与氧化镍相互作用,阻止了制备过程中氧化镍颗粒的长大。更多还原

【Abstract】 Rare earth modified nickel catalysts NiOxREyOz were synthesized by decomposition and solid-state reaction of nickel nitrate and rare earth nitrates.These new catalysts were characterized by X-ray power diffraction(XRD),temperature-programmed reduction(TPR),and scanning electron microscopy(SEM).The results showed that La reacted with nickel oxide to form perovskite at 800 ℃,and Pr reacted with nickel oxide at 1400 ℃,while Sm and Gd did not react with nickel oxide.The addition of rare earth oxides greatly reduced the particle sizes of nickel oxide.The TPR results depicted that rare earth modification resulted in a decrease of the reduction temperature of nickel oxide and the appearance of a higher temperature reduction peak by interaction rare earth oxide with nickel oxide.更多还原