Acta Phys. -Chim. Sin. ›› 2004, Vol. 20 ›› Issue (11): 1313-1319.doi: 10.3866/PKU.WHXB20041106

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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

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