催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (7): 596-600.

• 研究论文 • 上一篇    下一篇

还原气氛对钴锆共沉淀催化剂结构和费托合成反应性能的影响

贾丽涛1,2,房克功1,陈建刚1,孙予罕1   

  1. 1 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; 2 中国科学院研究生院, 北京 100049
  • 收稿日期:2007-07-25 出版日期:2007-07-25 发布日期:2011-07-25

Effects of Reduction Atmosphere on Structure and Catalytic Activity of Co-ZrO2 Catalyst for Fischer-Tropsch Synthesis

JIA Litao1,2, FANG Kegong1, CHEN Jiangang1, SUN Yuhan1*   

  1. 1 State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, The Chinese Academy of Sciences, Taiyuan 030001, Shanxi, China; 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2007-07-25 Online:2007-07-25 Published:2011-07-25

PDF

1168

被引次数

43

摘要： 采用程序升温还原、氮吸附、原位X射线衍射、扫描电镜和透射电镜等方法研究了不同还原气氛对钴锆共沉淀催化剂结构的影响,并考察了催化剂上费托合成反应的性能. 结果表明, H2还原对催化剂的破坏程度较小,活性相主要是面心立方钴; CO还原导致催化剂发生积碳,催化剂中出现面心立方钴和六方钴的混晶; 合成气还原使催化剂烧结严重,单质钴以面心立方和六方两种晶相存在. 费托合成反应结果表明, CO还原后催化剂没有催化性能, H2还原与合成气还原后催化剂的催化活性相差不大,但前者CH4选择性较低.

关键词: 钴, 氧化锆, 还原气氛, 氢气, 一氧化碳, 合成气, 费托合成

Abstract: The effects of reduction atmosphere on the structure of the Co-ZrO2 coprecipitation catalyst and its catalytic activity for Fischer-Tropsch synthesis were investigated by means ofX-raydiffraction, transmission electron microscopy, scanning electron microscopy, and temperature-programmed reduction. The reduction of the Co-ZrO2 catalyst in CO atmosphere led to an increase in BET surface area but obvious decrease in syngas atmosphere. The cubic metallic cobalt species (2θ=44.4°) was observed for the catalyst reduced in H2. After the reduction of the catalyst in either syngas or CO, both the cubic metallic cobalt and hexagonal metallic cobalt (2θ=41.7° and 47.5°) appeared with the presence of the carbon deposition. No catalytic activity was detected for the catalyst sample reduced in CO owing to the severe carbon deposition. The catalyst samples reduced in either syngas or H2 showed the similar CO conversion though the carbon deposition was observed for the former, and its high CH4 selectivity could be attributed to the presence of carbon deposition.

Key words: cobalt, zirconia, reduction atmosphere, hydrogen, carbon monoxide, syngas, Fischer-Tropsch synthesis