高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (2): 301.

• 论文 • 上一篇    下一篇

化学修饰氧化铝负载钴基催化剂吸附与反应行为的研究

张俊岭, 陈建刚, 董庆年, 任杰, 孙予罕   

  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, 太原 030001
  • 收稿日期:2002-04-16 出版日期:2003-02-24 发布日期:2003-02-24
  • 通讯作者: 孙予罕(1963年出生),男,博士,研究员,博士生导师,从事多相催化和纳米材料研究.E-mail:yhsun@sxicc.ac.cn E-mail:yhsun@sxicc.ac.cn
  • 基金资助:

    国家重点基础研究发展规划项目(批准号:G1999022402)资助

Adsorption and Reaction Behavior of F-T Co catalysts Supported by Chemically-modified Alumina

ZHANG Jun-Ling, CHEN Jian-Gang, DONG Qing-Nian, REN Jie, SUN Yu-Han   

  1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
  • Received:2002-04-16 Online:2003-02-24 Published:2003-02-24

摘要: 提出了一种改进催化剂活性和C5+烃选择性的方法,利用原位红外光谱、TPSR和费-托合成反应考察了催化剂的还原、分散、吸附与反应行为的关系.研究表明,载体处理的差异决定了CO在催化剂表面上的吸附形态,钴负载在氨修饰氧化铝上有利于桥式CO吸附,而醋酸改性氧化铝则增进了金属钴与载体之间的相互作用,催化剂以线形吸收态为主.CO加氢反应表明,氨修饰氧化铝负载钴催化剂能促进活性和C+5烃选择性的提高,而醋酸修饰氧化铝可抑止钴催化剂的活性和碳链增长.

关键词: Co/Al2O3催化剂, 化学修饰, 酸碱介质, 原位红外光谱, CO加氢

Abstract: The influence of chemically-modified alumina on the adsorption and reaction behavior of Co catalysts was investigated by in situ FTIR, TPSR and Fischer-Tropsch synthesis. The adsorption of CO was determined by the alumina support treated in acid/base media. For the Co catalyst supported onto the ammonia-modified alumina, more bridged-form CO appeared, while the linear-form CO for the acetic acid-modified alumina was dominant. The bridged-form CO mostly participated in CO hydrogenation. CO hydrogenation showed that the Co catalyst supported onto the ammonia-modified alumina favored to increase the catalytic activity and C5+ selectivity, and however, the Co catalyst supported onto the acetic acid-modified alumina suppressed the activity and the carbon chain growth.

Key words: Co/Al2O3 catalyst, Chemical modification, Acid/base media, In situ FTIR, CO hydrogenation

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