作　　者： ; ;

机构地区： 清华大学化学工程系绿色反应工程与工艺北京市重点实验室

出　　处： 《催化学报》 2002年第6期513-516,共4页

摘　　要： 考察了反应条件对Co CeO2 /SiO2 催化剂上费 托合成反应性能的影响 ,并对催化剂进行了 10 0 0h稳定性和再生性能实验 .结果表明 ,添加铈助剂后 ,催化剂具有良好的稳定性和再生性能 ,整个过程中CO转化率为 89 7% ,C5+ 烃类 (主要组成为C10 ～C2 0 直链烃 )选择性为 81 0 % ,链增长几率为 0 90 .催化剂的活性表面被反应产物蜡覆盖时 ,阻碍了反应物与活性中心的结合 ,是导致催化剂活性降低的主要原因 . A series of cerium-promoted Co/SiO2 catalyst samples for F-T synthesis were prepared and evaluated. The effects of reaction conditions (temperature, pressure and GHSV) on the reaction were studied. With temperature increasing, the CO conversion increases gradually, however the selectivity for C5+ hydrocarbons first ascends and then goes down. The CO conversion increases with increasing pressure but decreases with increasing GHSV, so does the selectivity for C5+ hydrocarbons. At reaction condition of T = 488 K, p = 1.5 MPa and GHSV = 500 h(-1), the CO conversion and the C5+ selectivity have the maximum values of 98% and 87% respectively. The catalyst has good stability and regeneration ability. During the initial 200 h, the activity of the catalyst decreased slowly, then it kept stabilization for about 300 h. In the next 200 h, the activity decreased gradually again. After 700 h, the C5+ selectivity could not keep above 80%. The drop of the catalyst activity is due to the wax produced during the reaction, covering the active sites of the catalyst, so that the reactants can not contact with the active sites. After regenerated by hydrogen, the catalyst exhibited almost the same activity as that of the fresh one. The average results during the 1000 h test are CO conversion of 89.7% and C5+ selectivity of 81.0%. The C5+ products are mainly composed of C-10 similar to C-20 linear hydrocarbons (62.9%), and the chain growth probability of the products is 0.90. After 1000 h test, the structure of the catalyst kept stable.

关 键 词： 催化剂 钴基催化剂 铈助剂 氧化硅 费 托合成 反应条件 重质烃

领　　域： [化学工程] [石油与天然气工程]