催化学报

催化学报 ›› 2012, Vol. 33 ›› Issue (5): 808-812.DOI: 10.3724/SP.J.1088.2012.10917

• 研究论文 • 上一篇    下一篇

Li 助剂对 Co/AC 催化剂上 CO 加氢制直链混合伯醇反应性能的影响

裴彦鹏1,3, 丁云杰1,2,*, 臧娟1,3, 宋宪根1,3, 董文达1,3, 朱何俊1, 王涛1, 陈维苗1   

  1. 1中国科学院大连化学物理研究所洁净能源国家实验室, 辽宁大连 116023; 2中国科学院大连化学物理研究所催化基础国家重点实验室, 辽宁大连 116023; 3 中国科学院研究生院, 北京 100049
  • 收稿日期:2011-10-30 修回日期:2011-11-27 出版日期:2012-05-09 发布日期:2012-05-09

Effects of Li Promoter on the Performance of Co/AC Catalysts for CO Hydrogenation to Mixed Linear α-Alcohols

PEI Yanpeng1,3, DING Yunjie1,2,*, ZANG juan1,3, SONG Xiangen1,3, DONG Wenda1,3, ZHU Hejun1, WANG Tao1, CHEN Weimiao1   

  1. 1Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China; 2State Key Laboratory for Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China; 3Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2011-10-30 Revised:2011-11-27 Online:2012-05-09 Published:2012-05-09

PDF

990

被引次数

18

摘要： 采用 CO 加氢反应、X 射线衍射、程序升温还原和 CO 程序升温脱附等技术研究了 Li 助剂对活性炭负载的 Co 催化剂 (Co/AC) 上 CO 加氢反应性能的影响. 结果表明, Li 的添加抑制了气态烃的生成, 提高了 C5+ 和直链混合伯醇的选择性, 但催化剂活性下降. 这可能源于 Li 的加入抑制了 Co2+ 物种的还原, 降低了反应速控步骤—?强吸附 CO 的解离能力. 另外, Li 也促进了 Co2C 物种的生成, 使得产物中混合醇的比例增加.

关键词: 合成气, 直链混合伯醇, 锂助剂, 碳化钴物种

Abstract: The effect of Li promoter on the catalytic performance of the activated carbon (AC) supported cobalt catalysts (Co/AC) for CO hydrogenation was investigated by means of CO hydrogenation, X-ray diffraction (XRD), temperature-programmed reduction (H2-TPR), and temperature-programmed desorption of adsorbed CO (CO-TPD). The results showed that the addition of Li significantly suppressed the formation of gaseous hydrocarbons and remarkably improved the selectivities for higher hydrocarbons (C5+) and mixed linear α-alcohols (C1–C18) of CO hydrogenation over the Co/AC catalyst. However, the activity of CO hydrogenation decreased gradually with the increase of Li loading in the Co-based catalyst. H2-TPR and CO-TPD results illuminated that the existence of Li decreased the reducibility of Co2+ and the ability of CO dissociation, which was the rate-determining step. XRD results indicated that the existence of Li promoter enhanced the formation of Co2C species.

Key words: syngas, mixed linear α-alcohol, lithium promoter, cobalt carbide species