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近十几年来,用脉冲-应答技术测定催化剂的传递和吸附系数,受到了广泛的注意.在这种测量技术中,对应答峰的分析方法已提出5～6种之多.其中,富里埃分析法是比较准确的方法之一.研究中采用富里埃分析法求取了固定床反应器中多孔催化剂的三种传递系数(轴向扩散系数E、膜扩散系数K_f、粒内有效扩散系数D_e)和两种吸附系数(吸附平衡常数K_a和吸附速率常数K_a),并对所得的结果进行了灵敏度分析.实验结果说明了这一方法的优点.此外,还探讨了目标函数和周期的选取对测量的影响.对各参数灵敏度考察的结果:在低速区,K_a和k_f最灵敏,D_e次之,E和k_a的灵敏度很低;在高速区,所得结果与文献报道一致(K_a和D_e最灵敏,E次之,k_f和K_a的灵敏度很低).
In recent decades, the pulse-response measurement of catalyst transfer and adsorption coefficient has received widespread attention in this measurement technique, the analysis of the response peak has been proposed as many as 5 to 6. Among them, Analytical method is one of the more accurate methods.In this study, three kinds of transfer coefficients (axial diffusion coefficient E, membrane diffusion coefficient K_f, effective diffusion coefficient D_e ) And two kinds of adsorption coefficients (adsorption equilibrium constant K_a and adsorption rate constant K_a), and the sensitivity analysis of the results obtained.The experimental results illustrate the advantages of this method.In addition, the selection of the objective function and the period pair The sensitivity of each parameter was examined: In the low-speed area, K_a and k_f were the most sensitive, D_e was the second, and the sensitivity of E and k_a was very low. In the high-speed area, the results were consistent with those in the literature (K_a and D_e were the most sensitive , Followed by E, the sensitivity of k_f and K_a is very low).