活性炭负载钴基催化剂费托合成本征动力学

Intrinsic kinetics of Fischer-Tropsch synthesis over Co/AC catalyst

在温度220℃～250℃、压力2.0MPa～4.0MPa、空速2000h-1～3500h-1、n(H2)/n(CO)=1.0～2.5的条件下,在固定床等温积分反应器中研究了活性炭负载钴基催化剂(Co/AC)的本征动力学。结合碳化物机理以及CO插入机理,通过假设不同的基元反应以及速率控制步骤推导得到了不同的本征动力学方程。根据实验测定数据,采用Levenberg-Maquardt算法回归得到模型参数,并通过统计检验以及相对误差分析得到了适宜的Co/AC催化剂费托合成的本征动力学方程。

The intrinsic kinetics of Fischer-Tropsch synthesis over Co/AC catalyst was studied in an isothermal integral fixed bed reactor under the following operation conditions： temperature of 220℃-250℃,pressure of 2.0MPa-4.0 MPa,H2/CO molar ratio of 1.0-2.5 and space velocity of 2000h-1-3500h-1.With combination of carbide mechanism and CO insertion mechanism,several intrinsic kinetic expressions were derived by assuming different elementary reactions and rate-determining reactions.Matlab software and Levenberg-Marquardt algorithm were used in the parameter estimation procedure.The statistical analysis and relative residual analysis were applied to check out the applicability of intrinsic kinetic models.The results indicated that the intrinsic kinetic expression FT-4 was reasonable for Fischer-Tropsch synthesis over Co/AC catalyst.