Acta Phys. -Chim. Sin. ›› 2004, Vol. 20 ›› Issue (08S): 906-910.doi: 10.3866/PKU.WHXB200408zk03

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Effect on the Carbon Deposit in CO2 Reforming of CH4 over Ni/Ce-Zr-Al-Ox Catalyst by Adding Steam

Li Chun-Lin;Fu Yi-Lu   

  1. Department of Chemical Physics, University of Science and Technology of China, Hefei 230026
  • Received:2003-08-11 Revised:2003-11-18 Published:2004-08-15
  • Contact: Fu Yi-Lu

Abstract: A Ni/Ce-Zr-Al-Ox catalyst was prepared by hydrothermal synthesis-impregnation method. The CO2 reforming of CH4 reaction was performed. By XPS and TPH methods the carbon species deposited on the surface of catalyst during the reaction were characterized; The effect on the carbon deposit by adding a small amount of steam in feed gas and the interaction between steam and carbon species were studied. The results obtained show that there are mainly two types of carbon species :α-carbon appearing at 250~350 ℃ should be mainly CH4 decomposed fragment which shows reactive to hydrogenation; β-carbon appearing at about 700 ℃ should be the unreactive carbon which tends to be graphite or is graphitized carbon and is responsible for catalyst deactivation. β-carbon is easier to react with steam than α-carbon, therefore adding a small amount of steam in feed gas can obviously suppress β-carbon deposit. The activity test shows that the Ni/Ce-Zr-Al-Ox catalyst has a CH4 conversion of 89% and a good stability, and the CH4 conversion increases to 94% by adding 3.2%(φ) steam. In addition, due to the suppression to unreactive carbon, it can be expected that the stability of catalyst will be further promoted.

Key words: Ni/Ce-Zr-Al-Ox catalyst, CO2 reforming of CH4, Carbon deposit, Steam, TPH, XPS