物理化学学报 >> 2014, Vol. 30 >> Issue (9): 17451745-1751.doi: 10.3866/PKU.WHXB201405301

催化和表面科学 上一篇    下一篇

微量Li助剂对Co/AC催化剂合成高碳醇性能的影响

董文达1,3, 朱何俊1, 丁云杰1,2, 裴彦鹏1,3, 杜虹1,3, 王涛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. 中国科学院大学, 北京 100049
  • 收稿日期:2014-03-31 修回日期:2014-05-29 发布日期:2014-08-29
  • 通讯作者: 丁云杰 E-mail:dyj@dicp.ac.cn
  • 基金资助:

    国家自然科学基金(20973167)

Effect of Trace Amounts of Li Doping on Performance of Co/AC Catalysts for Syntheses of Mixed Linear α-Alcohols

DONG Wen-Da1,3, ZHU He-Jun1, DING Yun-Jie1,2, PEI Yan-Peng1,3, DU Hong1,3, WANG Tao1   

  1. 1. Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning Province, P. R. China;
    2. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning Province, P. R. China;
    3. University of Chinese Academy of Sciences, Beijing 100049, P. R. China
  • Received:2014-03-31 Revised:2014-05-29 Published:2014-08-29
  • Contact: DING Yun-Jie E-mail:dyj@dicp.ac.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20973167).

摘要:

采用等体积浸渍法制备了含微量Li 的15CoxLi/AC 催化剂,考察了微量Li 助剂对15Co/AC催化剂上CO加氢合成高碳醇性能的影响. 采用X射线衍射、程序升温还原和程序升温表面反应技术对15CoxLi/AC 催化剂进行了表征,结果表明,微量Li 的添加可以提高催化剂上CO加氢活性、生成C5+烃的选择性、合成醇的选择性以及高碳醇的分布. 这主要是由于微量Li 助剂与Co物种形成了弱相互作用,促进了催化剂Co物种的分散,形成较小Co晶粒,促进了Co2C的形成.

关键词: 合成气, 混合醇, Co/AC催化剂, 微量Li 助剂, 碳化钴物种

Abstract:

15CoxLi/AC catalysts promoted by different trace amounts of Li doping were prepared by incipientwetness impregnation. The catalysts were investigated by means of CO hydrogenation and characterized by X-ray diffraction (XRD), temperature-programmed reduction (H2-TPR), and temperature-programmed surface reaction (TPSR) techniques. The results show that CO conversion, selectivity towards C5+ hydrocarbons, selectivity towards mixed linear α-alcohols and the distribution of higher alcohols (C6+OH) in the alcohol products were improved by adding trace amounts of Li to the 15Co/AC catalysts. XRD, H2-TPR, and TPSR results indicate that the existence of trace amounts of Li promotes weak interaction between Li and Co species, disperses the Co species of the catalysts, decreases the size of metallic Co particles, and promotes the formation of Co2C species.

Key words: Syngas, Mixed linear α-alcohols, Co/AC catalyst, Trace amounts of Li doping, Co2C species

MSC2000: 

  • O643