摘要
在超临界CO2中以活性炭为模板,乙酰丙酮铝为前驱体制备了氧化铝多孔材料。研究了超临界状态下涂层的温度和压力对涂层率的影响,确定了最佳的涂层条件为涂层温度为80℃、压力为22 MPa,为最佳的涂层条件。通过X射线衍射(XRD)测试表明,所得产物为α-Al2O2多孔材料。根据产物的N2气吸附-脱附等温线计算得到,产物的比表面积为67．20 m2／g,平均孔径为4 nm左右。扫描电镜的结果证明,产物在一定程度上实现了对模板的复制,同时透射电子显微镜测试结果显示,氧化铝纳米颗粒尺寸具有良好的分散性。
Porous alumina material was prepared with activated carbon as template and aluminum acetylacetohate as precursor in supercritical carbon dioxide （ SC-CO2 ）. The effects of coating temperature and pressure on the coating ratio in the supercritical CO2 were studied, and optimal coating conditions at 80 ℃ and 22 MPa were explored. The X-ray diffraction （XRD） result shows that the product is α-Al2O3, the BET surface areas calculated from the nitrogen adsorption isotherms of the product is up to 67. 20 m^2/g and the average pore diameter is about 4 nm. SEM experimental results indicated the activated carbon template was well replicated by the porous product and TEM results showed the Al2O3 nanoparticles were well dispersed in the product.
出处
《应用化学》
CAS
CSCD
北大核心
2007年第1期17-20,共4页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金(20404012)
河南省自然科学基金(0411020900)
河南省杰出青年科学基金(0512001200)资助项目
关键词
超临界CO2
活性炭
模板
氧化铝
多孔
supercritical carbon dioxide, activated carbon, template, alumina, porous
