物理化学学报 >> 2004, Vol. 20 >> Issue (11): 1313-1319.doi: 10.3866/PKU.WHXB20041106

研究论文 上一篇    下一篇

La促进型六铝酸盐Ba1xLaxFeAl11O19δ催化甲烷燃烧性能

蒋政;侯红霞;郝郑平;康守方;李进军;胡春   

  1. 中国科学院生态环境研究中心,北京 100085
  • 收稿日期:2004-05-11 修回日期:2004-06-06 发布日期:2004-11-15
  • 通讯作者: 郝郑平 E-mail:zpinghao@mail.rcees.ac.cn

Effects of La Incorporation in Ba1xLaxFeAl11O19δ on the Performance of Methane Catalytic Combustion

Jiang Zheng;Hou Hong-Xia;Hao Zheng-Ping;Kang Shou-Fang;Li Jin-Jun;Hu Chun   

  1. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085

  • Received:2004-05-11 Revised:2004-06-06 Published:2004-11-15
  • Contact: Hao Zheng-Ping E-mail:zpinghao@mail.rcees.ac.cn

摘要: 用碳酸铵水溶液共沉淀法制备了系列Ba1xLaxFeAl11O19δ六铝酸盐型催化剂,并以甲烷燃烧为探针反应考察催化剂的催化活性.La部分取代Ba提高了催化剂的催化甲烷燃烧活性,且随La取代量的增加,催化剂的起燃温度呈规律性变化,镧、钡之间存在最佳配比,活性最好的催化剂为Ba0.2La0.8FeAl11O19δ,其催化甲烷燃烧的起燃温度仅有495 ℃(VCH4:VO2:VN2=1:4:95).XRD和SEM结果表明,不同含量镧掺杂的材料经1 200 ℃焙烧5 h后,呈现典型的六铝酸盐结构特征;不同温度的焙烧实验表明掺杂镧能够促进六铝酸盐相的形成.Diffuse UV-Vis表征表明催化剂中的铁呈+3价,Diffuse UV-Vis, TPR和FT-IR结果表明Ba、La、Fe之间存在协同作用.

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Abstract: Series of Ba1-xLaxFeAl11O19-δ hexaaluminate catalysts were prepared by (NH4)2CO3 co-precipitation method and their performance for methane catalytic combustion was studied. The obtained materials were characterized by XRD, Diffuse UV-Vis, FT-IR, TPR, and N2 BET techniques. The results showed that partial substitution of Ba with La in Fe-hexaaluminates could enhance catalytic activity for methane combustion, and the optimal catalyst was Ba0.2La0.8FeAl11O19-δ hexaaluminate, whose light-off temperature was as low as 495 ℃ denoted by 10% conversion of methane (VCH4/VO2/VN2=1/4/95). XRD and SEM characterization indicated that the samples formed well-defined hexaaluminate phase after calcination at 1 200 ℃ for 5 h, and the dopant of La could promote the formation of hexaaluminate phases. UV-Vis-DR characterization revealed that the oxide state of Fe is +3 in Ba1-xLaxFeAl11O19-δcatalysts. The synergism between Ba, La and Fe was observed based on the results of UV-VisDR, FT-IR and TPR.

Key words: La-doped, Fe-substituted Ba (La) hexaaluminate, Catalytic combustion of methane, Synergism