钾助剂对Co/SiO2费-托合成催化剂性质及反应性能的影响  

Effects of Potassium Promoter on Properties of Co/SiO_2 Catalyst and Its Performance for Fischer-Tropsch Synthesis

作　　者：高海燕[1,2] 相宏伟[2] 李永旺[2] 

机构地区：[1]江南大学食品胶体与生物技术教育部重点实验室、化学与材料工程学院,江苏无锡214122 [2]中国科学院山西煤炭化学研究所、煤转化国家重点实验室,山西太原030001

出　　处：《石油学报（石油加工）》2012年第2期236-241,共6页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金重大项目(20590361);中央高校基本科研业务费专项资金项目(JUSRP211A12)资助

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。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.

关 键 词：钴催化剂 二氧化硅 K助剂 费-托合成 

分 类 号：TQ139.2[化学工程—无机化工]