高等学校化学学报

高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (9): 1448.

• 论文 • 上一篇    下一篇

H2,CO和H2/CO在ZrO2催化剂上吸附行为研究

吴贵升, 陈小平, 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:1999-11-19 出版日期:2000-09-24 发布日期:2000-09-24
  • 通讯作者: 孙予罕(1963年出生),男,博士,研究员,博士生导师,主要从事C1化学研究.E-mail:cxp@ms.sxicc.ac.cn E-mail:cxp@ms.sxicc.ac.cn
  • 基金资助:

    国家自然科学基金(批准号:29873064)资助

Studies of Adsorbed Species of CO, H2 and CO/H2 over ZrO2

WU Gui-Sheng, CHEN Xiao-Ping, REN Jie, SUN Yu-Han   

  1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
  • Received:1999-11-19 Online:2000-09-24 Published:2000-09-24

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摘要： 用insituFTIR法研究了H2、CO及CO/H2在ZrO2表面的吸附行为.结果表明,H2在ZrO2表面吸附存在两种形态的羟基(即ZrOH和ZrOHZr),吸附温度增加,羟基数量增加.CO在200℃易与ZrO2表面羟基作用形成甲酸盐物种,吸附温度升高时,该物种逐渐分解生成CO和ZrOH.当CO和H2共存时,表面甲酸盐的量明显增加,并随温度增加,逐渐加氢形成甲氧基,最后生成甲烷.甲氧基的加氢过程较慢,所需反应温度也较高,被认为是CO加氢合成醇的速控步骤.

关键词: in situ FTIR, H2, CO, 吸附行为

Abstract: The adsorption of CO, H2 and CO/H2 on ZrO2 was investigated by in situ FTIR. H2 species adsorbed over ZrO2 produced two bands at 3780 and 3680 cm-1, corresponding to ZrOHZr and ZrOH, respectively. COadsorbed on ZrO2 formed formate species at 200 ℃, which slowly decomposed to COwith the rise of adsorption temperature. The formate over ZrO2 could be hydrogenated into methoxide species and methane in H2. As a result, the hydrogenation of methoxide, which proceeded slowly relatively, seemed to be the rate-determining step.

Key words: in situ FTIR, H2, CO, Adsorption

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