Potassium-decorated active carbon supported Co-Mo-based catalyst for water-gas shift reaction

作者：Lian, Yixin; Xiao, RuiFen; Fang, Weiping; Yang, Yiquan^*

来源：Journal of Natural Gas Chemistry, 2011, 20(1): 77-83.

DOI：10.1016/S1003-9953(10)60154-5

• active carbon
• potassium-decorated
• active phase
• Co-Mo-based catalyst
• water-gas shift

The effect of potassium-decoration was studied on the activity of water-gas shift (WGS) reaction over the Co-Mo-based catalysts supported on active carbon (AC), which was prepared by incipient wetness co-impregnation method. The decoration of potassium on active carbon in advance enhances the activities of the CoMo-K/AC catalysts for WGS reaction. Highest activity (about 92% conversion) was obtained at 250 degrees C for the catalyst with an optimum K2O/AC weight ratio in the range from 0.12 to 0.15. The catalysts were characterized by TPR and EPR, and the results show that activated carbon decorated with potassium makes Co-Mo species highly dispersed, and thus easily reduced and sulfurized. XRD results show that an appropriate content of potassium-decoration on active carbon supports may favors the formation of highly dispersed Co9S8-type structures which are situated on the edge or a site in contact with MoS2, K-Mo-O-S, Mo-S-K phase. Those active species are responsible for the high activity of CoMo-K/AC catalysts.

• 出版日期2011-1
• 单位厦门大学; 福建师范大学