摘要
采用共沉淀法制得了Ｃｕ２＋部分取代Ｌａ３＋的Ｌａ１－ｘＣｕｘＭｎＯ３钙钛矿型催化剂，通过ＸＲＤ、ＴＰＲ、电镜分析及活性评价，研究了Ｃｕ２＋的部分取代对Ｌａ１－ｘＣｕｘＭｎＯ３系催化剂性能的影响．结果表明，Ｃｕ２＋部分取代Ｌａ３＋后，使催化剂易被还原，活化能降低，对ＣＨ４、ＣＯ氧化反应，均有最佳取代量使催化剂的活性最佳，其值分别为０．２和０．４，这是由于随ｘ值的增大，催化剂晶格缺陷增多。
The catalytic properties of La 1- x Cu x MnO 3 perovskite type catalysts prepared by coprecipitation have been studied by means of XRD, TPR, TEM, SEM, EMPA, activity evaluation and etc. The results reveal that the activation energy of La 1- x Cu x MnO 3 catalysts decreases with the increase of x from 0 to 0 6 and the activity of the catalysts for CO and CH 4 oxidation has a maximum point (for CO oxidation x =0 4 and for CH 4 oxidation x =0 2). It is considered that the above behaviour is caused by the increase of lattice defects and chemical potential of lattice oxygen in catalysts with the increase of x .
出处
《应用化学》
CAS
CSCD
北大核心
1997年第1期11-15,共5页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金
关键词
钙钛矿型
催化剂
铜
催化氧化
活性
perovskite type catalyst,property,copper substitution,catalytic oxidation,catalytic activity
