摘要
用热分解法合成 L a0 .8Me0 .2 Mn O3( Me:Na,K,Ca,Sr,Ba)和 La0 .8Sr0 .2 Mn0 .7M0 .3O3( M:Fe,Co,Ni,Cu)系列的钙钛矿型复合氧化物 ,用 TPD方法研究部分取代对样品的氧吸 -脱附性能的影响 .对于 L a0 .8Me0 .2 Mn O3系列 ,氧的吸 -脱附特性由 A位的离子半径、价态和物化性质决定 .对于B位取代基活性与可脱 α氧量并不成比例关系 ,其活性的决定因素可能是 B位离子的自氧化还原循环能力 .
La 0.8 Me 0.2 MnO 3(Me:Na,K,Ca,Sr,Ba)and La 0.8 Sr 0.2 Mn 0.7 M 0.3 O 3(M:Fe,Co,Ni,Cu)as two series of perovskite type composite oxides were synthesized by thermolysis.The effect of partial substitution on the oxygen adsorption desorption performance of the specimens was studied by temperature programmed desorption (TPD).Concerning to La 0.8 Me 0.2 MnO 3 series,radius and valence state and physicochemical property of A site component inos decide their oxygen andsorption desorption property.Concerning to Bsite componentions,the ability of auto redox and circulation may be the deciscive factor of activity;the substitution of their activities does not proportional to the amount of α oxygen desorption.
出处
《华侨大学学报（自然科学版）》
CAS
2000年第4期399-403,共5页
Journal of Huaqiao University(Natural Science)
基金
福建省自然科学基金资助项目
关键词
钙钛矿型复合氧化物
催化氧化活性
氧脱附特性
perovskite type composite oxides, TPD, substitution, oxidation, activation
