助剂钾对镍基催化剂性能影响研究进展

A review of potassium promoter effect on nickel-based catalyst performance

镍基催化剂是生物质气化及焦油转化过程中活性最高的催化剂之一,但容易因积炭失活影响寿命,降低制氢过程的经济性。添加助剂不仅可以有效提高催化剂的抗积炭能力,还可以提高催化剂的稳定性。本文综述了助剂钾对镍基催化剂抗积炭能力及反应活性的影响,分析了助剂钾影响积炭生成和积炭气化的机理。助剂钾能够提高镍基催化剂的抗积炭能力,抑制催化剂的烧结,提高催化剂的稳定性。未来的研究方向是进一步考察助剂钾的种类、添加方式对镍基催化剂的抗积炭能力及焦油转化活性的影响与本质原因,以制备出具有高活性、高抗积炭能力、长寿命的生物质气化镍基催化剂。

Nickel-based catalyst is one of the most promising catalysts in biomass gasification and tar reforming,but it deactivates fast due to carbon deposition,compromising its economic efficiency. Promoter addition can improve both its resistance to carbon deposition and stability. Potassium can be used as a catalyst for biomass gasification and tar reforming,and it significantly suppresses the coke deposition on catalyst. The present review is focused on the influence of potassium promoter on the performance of nickel-based catalyst,including its resistance to carbon deposition,catalytic activity, coke formation and gasification mechanism. The addition of potassium promoter can significantly suppress coke formation and catalyst sintering,and improve its thermal stability. Investigations on various species of potassium promoter and different addition methods are suggested for future research,in order to obtain essential mechanism and performance details,and to produce a novel nickel-based catalyst with high activity,high resistance to carbon deposition and long lifetime for biomass gasification.