Effect of Thermal Treatment on the Structure and Catalytic Activity of Supported Fischer-Tropsch Nano-Cobalt Catalysts for Clean Fuels
A series of 15wt％ Co/Al2O3 catalysts were prepared by incipient wetness impregnation under various calcination conditions ( 90-500 ℃), and were characterized by XRD, XPS, temperature programmed reduction (TPR), and catalytic measurements of hydrogenation of carbon monoxide to long-chained hydr℃arbons leading to clean fuels (Fischer-Tropsch Synthesis). The results of XPS show the presence of incompletely decomposed cobalt nitrate for catalysts calcined at 90-200 ℃, and the presence of Co3O4 for catalysts calcined at 200-500 ℃. For the four alumina-supported nano-cobalt catalysts with different thermal treatment (200-500 ℃), XRD and XPS results illustrated that there were mainly nano Co3O4 crystalite phases of 9-10 nm and the size of cobalt nano-particles did almost not change with the different temperature of thermal treatment. This was different from that of silica-supported cobalt catalysts. The supported cobalt catalyst (CoAp340 sample) calcinated at 340℃ presented a better activity for Fischer Tropsch synthesis to clean fuels, at mild conditions like atmospheric pressure (1 bar), 1800 ml/g/h and 190 ℃; rather than high pressure (20 bars or more).
Cobalt catalyst Nano cobalt particles Fischer Tropsch synthesis Reducibility XPS XRD Cobalt species
储伟 洪景萍 A.Khodakov E.Payan 戴晓雁
四川大学化工学院,成都610065,中国 法国里尔科技大学,里尔催化研究实验室,59655,法国
国际会议
成都
英文
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）