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Citation: Li Chun-Lin, Fu Yi-Lu. Effect on the Carbon Deposit in CO₂ Reforming of CH₄ over Ni/Ce-Zr-Al-O_x Catalyst by Adding Steam[J]. Acta Physico-Chimica Sinica, ;2004, 20(08S): 906-910. doi: 10.3866/PKU.WHXB200408zk03 shu

Effect on the Carbon Deposit in CO₂ Reforming of CH₄ over Ni/Ce-Zr-Al-O_x 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 Date: 11 August 2003
Available Online: 15 August 2004

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 od 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.
- Ni/Ce-Zr-Al-O_x catalyst;CO₂ reforming of CH₄;Carbon deposit;Steam;TPH;XPS
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Effect on the Carbon Deposit in CO2 Reforming of CH4 over Ni/Ce-Zr-Al-Ox Catalyst by Adding Steam

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通讯作者: 陈斌, bchen63@163.com

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