文献类型：期刊文献

中文题名：整体结构催化剂浸渍过程的动力学行为

英文题名：Kinetic behavior of metal ion impregnation on monolithic support

作者：王寅[1];赫崇衡[1];汤睿[1];冯大龙[1];李平[1]

机构：[1]华东理工大学化学工程联合国家重点实验室,上海200237

年份：2011

卷号：62

期号：5

起止页码：1282

中文期刊名：化工学报

外文期刊名：CIESC Journal

收录：CSTPCD;;EI(收录号：20112714112396);Scopus;北大核心:【北大核心2008】；CSCD:【CSCD2011_2012】；

基金：科技部国际合作项目(2007DFC61690)~~

语种：中文

中文关键词：整体结构催化剂;浸渍;金属离子;吸附速率;吸附等温线

外文关键词：monolithic support; impregnation; metal ions; adsorption rate; adsorption isotherm

摘要：以贵金属Pd(Ⅱ)和过渡金属Mn(Ⅱ)为活性组分,具γ-Al2O3涂层的堇青石陶瓷蜂窝为载体,采用过量浸渍法,考察了蜂窝型整体结构催化剂制备过程中浸渍条件(浸渍液pH值、温度和浓度)对活性组分在载体上吸附量的影响,确定了Pd(Ⅱ)和Mn(Ⅱ)适宜的浸渍pH值和温度。比较了浸渍液在蜂窝通道中的填充时间、浸渍液向γ-Al2O3涂层毛细孔内渗透时间、活性组分在蜂窝通道内溶剂中的扩散时间、活性组分在γ-Al2O3涂层毛细孔内溶剂中的扩散时间以及载体对活性组分的吸附时间,发现浸渍过程受吸附动力学控制。根据Lagergren吸附动力学模型拟合了活性组分在不同浓度下的吸附曲线,并以Langmuir和Freundlich吸附等温式对吸附等温线进行了拟合。结果表明,Lagergren二阶吸附模型更吻合实际吸附行为;Pd(Ⅱ)和Mn(Ⅱ)的吸附都遵循Langmuir单层吸附机制。
The effects of impregnating conditions,including pH,temperature and concentration of impregnating solution on the adsorption capacities of Pd（Ⅱ）and Mn（Ⅱ）over γ-alumina-coated cordierite honeycomb under excessive impregnation were studied.The solution fill-in time,capillary permeation time,solute diffusion time in solvent within honeycomb channel,diffusion impregnation time in pores of γ-Al2O3 and metal ion adsorption time were calculated respectively.The results revealed that the impregnation of Pd（Ⅱ）and Mn（Ⅱ）on the monolithic support was kinetically controlled.The adsorption kinetic curves of different concentrations of impregnating solution were simulated with both Lagergren first order and second order models.The results showed that Lagergren second order model fitted more properly with both Pd（Ⅱ）and Mn（Ⅱ）adsorption curves than Lagergren first order model.The adsorption isotherms were also been analyzed by using Langmuir and Freundlich models respectively.It could be concluded that the adsorption of both Pd（Ⅱ）and Mn（Ⅱ）on the honeycomb complied with Langmuir monolayer adsorption mechanism.