介孔La_2O_3的制备及性能研究  

Synthesis and Performance of Mesoporous La_2O_3

作　　者：陈慧华[1] 周钰明[1] 叶晓云[1] 

机构地区：[1]东南大学化学化工学院

出　　处：《中国稀土学报》2007年第5期573-577,共5页Journal of the Chinese Society of Rare Earths

基　　金：江苏省六大人才高峰(06-A-033);国家自然科学基金(50377005);教育部新世纪优秀人才支持计划(NCET-04-0482)资助项目

摘　　要：采用SDS-PEG复合模板剂,用均相沉淀法制备了不同孔径的介孔La2O3,用XRD,BJH,TG-DSC等方法对材料的结构和性能进行了表征,用IR-2型红外发射率测量仪测定了材料在8-14μm波段的红外发射率。结果表明：通过控制复合模板剂中PEG的量,可以有效调节介孔La2O3的孔径大小,PEG的添加可以明显增大介孔La2O3的孔径,且随PEG添加量的增多而逐渐增大。PEG的添加明显提高了介孔La2O3的热稳定性和结构稳定性。PEG与孔壁间存在较强的相互协同作用,介孔La2O3在8-14μm波段具有较低的红外发射率,且其红外发射率随材料的焙烧温度、最可几孔径的减小而逐渐降低。With SDS-PEG composite templates,mesoporous La2O3 with varied pore sizes controlled by the amount of PEG was prepared by homogeneous precipitation.The obtained samples were characterized by XRD,BJH and TG-DSC etc.And infrared emissivity in the range of 8～14 μm was measured by IR-2 infrared radiometer.The results showed that the pore diameter of mesoporous La2O3 increased greatly with the addition of PEG and both its thermal and structural stability were enhanced simultaneously.There were strong interactions between PEG and pore walls and the materials were endowed with much lower infrared emissivity in 8～14 μm wave bands,which reduced further as calcination temperature or utmost pore size decreased.

关 键 词：介孔La2O3 孔径 热稳定性 红外发射率 稀土 

分 类 号：TQ133.3[化学工程—无机化工] O611.62[理学—无机化学]