催化学报 ›› 2012, Vol. 33 ›› Issue (6): 1007-1013.DOI: 10.3724/SP.J.1088.2012.11215

• 研究论文 • 上一篇    下一篇

助剂促进的 Rh-Fe/Al2O3 催化剂上 CO 加氢制乙醇反应性能

陈维苗1, 丁云杰1,2,*, 宋宪根1,3, 朱何俊1, 严丽1, 王涛1   

  1. 1中国科学院大连化学物理研究所, 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:2011-12-22 修回日期:2012-01-19 出版日期:2012-05-30 发布日期:2012-05-30

Performance of Promoted Rh-Fe/Al2O3 Catalysts for CO Hydrogenation to Ethanol

CHEN Weimiao1, DING Yunjie1,2,*, SONG Xiangeng1,3, ZHU Hejun1, YAN Li1, WANG Tao1   

  1. 1Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China; 2State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China; 3Graduate University of Chinese Academy of Sciences, Beijing 100049
  • Received:2011-12-22 Revised:2012-01-19 Online:2012-05-30 Published:2012-05-30

摘要: 考察了 Fe, Rh 载量以及助剂对 Rh-Fe/Al2O3 催化剂上合成气制乙醇反应性能的影响. 结果表明, 随着 Fe 载量的增加, 甲醇选择性持续上升伴随着甲烷选择性的持续下降, 而乙醇选择性有最优值. 助剂的添加或多或少促进了甲醇耦合、CO 插入和解离的活性, 或抑制了催化剂加氢能力, 使得乙醇选择性有所上升, 甲醇选择性有所下降, 而烃类选择性变化不大. 随着 CO 加氢反应的进行, Rh-Fe/Al2O3 催化剂上烃类选择性逐渐下降, 但甲醇的生成活性逐渐上升, 而乙醇选择性和生成活性逐渐下降; 然而, 助剂的添加并未提高催化剂的稳定性. 这可能是由于在反应过程中 Fe 物种逐渐被合成气还原使得乙醇生成活性位数量逐渐减少所致.

关键词: 铑, 铁, 氧化铝, 负载型催化剂, 一氧化碳, 加氢, 乙醇

Abstract: The effects of Rh and Fe loading, and promoters on CO hydrogenation performance over Rh-Fe/Al2O3 catalysts were investigated, as well as the stability of the catalysts. The results showed that with the increasing of Fe loading, methanol selectivity produced from syngas increased continuously accompanying by the decrease in methane selectivity, but the ethanol selectivity had a maximum value. The addition of alkaline or alkaline earth metals promoted methanol coupling or CO dissociation and insertion, or suppressed hydrogenation ability more or less, as a result, ethanol selectivity enhanced, and methanol selectivity decreased, but hydrocarbon selectivity remained almost unchanged. With CO hydrogenation reaction proceeding, hydrocarbon selectivity decreased, but methanol selectivity increased gradually, unfortunately, ethanol selectivity decreased, and the additions of promoters had little effect on it, probably due to the reduction of Fe species by syngas or decreasing of Rh-Fe interface areas during reaction.

Key words: rhodium, iron, alumina, supported catalyst, carbon monoxide, hydrogenation, ethanol