响应面法研究非贵金属Co基催化剂于丙烷脱氢制丙烯的最佳工艺条件

Investigate of the optimum process conditions for Co/HZSM-5 catalyzed propane dehydrogenation by a response surface method

摘要: 采用浸渍法制备Co/HZSM-5催化剂用于丙烷催化脱氢制丙烯反应，对其进行预处理，使反应可在低温下进行，然后采用响应曲面考察工艺条件对该反应的影响。利用XRD、SEM、NH₃-TPD、H₂-TPR、氮气物理吸附-脱附等手段对催化剂进行表征，并在固定床反应器上对催化剂性能进行评价。结合实际实验条件可得最佳工艺条件为：反应温度461 ℃、Co负载量2.4%、GHSV为4300 h⁻¹；此时，丙烯收率为27.7%，对应的丙烯选择性93.8%。

Abstract: Co/HZSM-5 catalyst was fabricated for catalytic dehydrogenation of propane to propylene, which was pretreated to allow the reaction to react at low temperatures. A response surface approach was employed to examine the effect of process conditions on the reaction. The morphological and oxidative performance of Co/HZSM-5 was characterized by XRD, XPS, SEM, NH₃-TPD, H₂-TPR, and nitrogen physical absorption-desorption. Besides, the in-situ catalyst performance was evaluated by a fixed-bed reactor. Combining the actual experimental conditions, the optimal process conditions parameters obtained by the response surface method were as follows: a reaction temperature of 461 °C, a Co loading of 2.4%, and a GHSV of 4300 h⁻¹. At this point, the propylene yield reached 27.7% and the corresponding propylene selectivity was up to 93.8%.