以滤纸为模板制备多孔CeO_2纤维及其催化性能  

Porous Ceria Fibers Synthesized by Filter Paper as Templat and Their Catalytical Property

作　　者：陈丰[1] 曹煜[1] 刘成宝[1] 陈志刚[1] 

机构地区：[1]江苏省环境功能材料重点实验室,苏州科技学院化学与生物工程学院,苏州215009

出　　处：《机械工程材料》2014年第8期33-38,共6页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(21071107;21277094;21103119);江苏省产学研前瞻性联合研究项目(BY2012123);江苏省自然科学基金-青年基金资助项目(BK2012167);江苏省高校自然科学基金资助项目(12KJA430005;09KJB30003;11KJB430012);苏州市应用基础研究计划项目(SYG201242);苏州市科技支撑计划项目(SG201138);江苏省研究生科研创新计划项目(CXZZ11_0954);苏州科技学院校青年基金资助项目(XKQ201213)

摘　　要：以滤纸为模板,合成了具有滤纸微观形貌和纳米级孔均匀分布的CeO2纤维,利用热重分析、X射线衍射、电镜观察、氮气吸/脱附等方法对其进行表征,考察了前驱体溶液浓度对其微观结构的影响,最后研究了CeO2纤维的催化性能。结果表明：前驱体溶液浓度为0.02mol·L^-1时,合成的CeO2纤维的比表面积最大,约为84.7cm^2·g^-1,纤维长为0.5-5mm,直径为5-20μm,纤维结构由5-10nm的CeO2纳米晶组成,纳米孔径约为3nm,此多孔CeO2纤维具有良好的CO催化氧化活性,在450℃时的CO转化率可达100%;随着前驱体溶液浓度的增加,由于颗粒堆积,影响了产物对模板的复制效果。Biomorphic CeO2 fibers with the biomorphic structure of filter paper and uniform nano pores were successfully synthesized by taking the fitter paper as template. Many methods were used to characterize the CeO2, including thermogravimetric analysis, Xray diffraction, electron microscopy, nitrogen adsorption-desorption, etc. The effect of the precursor solution concentration on the structure of CeO2 fibers, and the catalytic property of CeO2 were studied. The results indicate that the synthesied CeO2 fibers consisting of 5-10 nm CeOe nanocrystals with the largest surface areas of about 84. 7 cm^2 · g^- 1 were 0. 5--5 mm in length, 5-20μm in diameter and 3 nm in pore size, when the concentration of the precursor solution was 0.02 mol · L^-1. These porous CeO2 fibers possessed a superior catalytic activity for CO oxidation and 100% CO conversion at 450℃. With the increase of precursor solution concentration, the copy effect of product for the template was impacted due to the grain accumulation.

关 键 词：生物模板 多孔结构 氧化铈 催化性能 

分 类 号：O614[理学—无机化学]