超声波法研究F-T合成铁基催化剂机械强度

Study on mechanical strength of iron catalyst for Fischer-Tropsch synthesis under ultrasonic radiation

采用超声波法研究了微颗粒催化剂磨损机械强度及其磨损机制,考察了超声介质、超声功率、固液比和超声时间等对磨耗率的影响,并在相同测试条件下,比较了熔铁催化剂和沉淀铁催化剂磨耗强度。结果表明,熔铁催化剂还原后耐磨强度略降,与此相反,沉淀铁催化剂还原后耐磨强度略有提高。由球磨法得到的熔铁催化剂存在较多微细粉末的粘附与团聚,影响测定结果,但熔铁催化剂的耐磨强度高于沉淀铁催化剂。基于形态和粒度分布的研究表明,超声波作用下熔铁催化剂主要磨损机制为剥层磨损,沉淀铁催化剂为体断裂或破碎机制。

The mechanical strength and wear mechanism of iron catalysts were studied under ultrasonic radiation. The influence of ultrasonic medium, power, solid-liquid ratio and time on abrasion rate was investigated. At the same ultrasonic condition, mechanical strength of iron-based catalysts for Fischer- Tropsch synthesis was compared before and after reduction. The results showed that the mechanical strength of fused-iron catalyst and precipitated iron catalysts after reduction declined and enhanced a little, respectively. Although there is an adhesion phenomenon on the surface of the fused-iron catalyst, in general, the mechanical strength of fused-iron catalyst was higher than that of precipitated iron catalyst. SEM and particle size distribution results showed that the main wear mechanism for fused-iron catalyst was abrasion, while fragmentation was the main wear mechanism for precipitated iron.