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本文采用石英弹簧BET重量法测定了20℃,CuO/ZnO/Al_2O_3型低变催化剂及三种与其具有可比相对组成的样品对苯的吸—脱附等温线。并分别采用Langmui方程,BET方程及层厚法对实验数据进行了处理。计算了单分子层饱和吸附量,比表而积等有关参数。利用圆筒孔等效模型,求出了孔容及平均孔径。给出了孔体积随孔径变化的孔径分布图。并结合四种样品的TPR谱图及x—衍射图谱分析,讨论了铜系低变催化剂的孔隙结构对其还原性能的影响。
In this paper, the sorption-desorption isotherms of benzene at 20 ℃, CuO / ZnO / Al_2O_3 catalysts and three samples with comparable composition were measured by BET method. The experimental data were processed by Langmui equation, BET equation and layer thickness method respectively. The saturated monolayer adsorption capacity, specific surface area and other relevant parameters were calculated. Using the equivalent model of cylinder bore, the pore volume and average pore diameter were obtained. The pore size distribution of pore volume with pore size is given. Combined with the TPR spectra and X-ray diffraction analysis of the four samples, the influence of the pore structure of copper-based low-shift catalysts on the reduction performance was discussed.