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中文摘要：
考察了钾（K）助剂（质量分数0.17%～4.98%）对Co/SiO2催化剂结构及其费-托合成（F-T）反应性能的影响。结果表明,K助剂趋向于存在催化剂的外表面,K助剂的添加显著降低了催化剂的比表面积。在H2气氛下对催化剂还原处理,添加K助剂不会降低催化剂的还原能力,反而会促进Co3O4的还原。在CO＋H2气氛中,K助剂会促进金属Co的氧化,使催化剂活性降低。少量的K助剂使催化剂的催化活性有所下降,但使产物中的C1～C4含量降低,烯/烷比增加。
英文摘要：
The effects of potassium（K） promoter（mass fraction 0.17%-4.48%） on the properties of Co/SiO2 catalyst and its performance for Fischer-Tropsch synthesis were studied.The results showed that K promoter which tended to lie on the outside surface of the Co-K/SiO2 catalyst had a poor intersolubility with Co species.The specific surface area of the Co-K/SiO2 catalyst decreased significantly as the addition of K promoter,which could not reduce the reduction ability of the Co-K/SiO2 catalyst but promoted the reduction of Co3O4 under the H2 atmosphere.The Co-K/SiO2 catalyst activity decreased as the oxidation of metal Co was promoted by the K promoter.By adding small amount of K promoter,the Co-K/SiO2 catalyst activity dropped but the amount of Cl-C4 hydrocarbons in products of Fischer-Tropsch synthesis decreased and the ratio of alkenes to alkyl increased.
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