Fabrication of CeZrO2 on Ni/SiO2 and promoted catalysis for methane autothermal reforming in a fluidized bed reactor

The methane autothermal reforming in the present of oxygen was studied over cerium- and zirconium-promoted Ni/SiO2 catalysts in a fluidized bed reactor. The addition of CeZrO2 resulted in a significant improvement in the initial activity of the catalysis as well as an increase in the stability. The...

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Bibliographic Details
Published in:	Journal of rare earths Vol. 27; no. 3; pp. 431 - 436
Main Author:	井强山方林霞楼辉郑小明
Format:	Journal Article
Language:	English
Published:	01-06-2009
Subjects:	Ni/SiO2催化剂催化重整氧化还原流化床反应器程序升温还原自热转化
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Summary:	The methane autothermal reforming in the present of oxygen was studied over cerium- and zirconium-promoted Ni/SiO2 catalysts in a fluidized bed reactor. The addition of CeZrO2 resulted in a significant improvement in the initial activity of the catalysis as well as an increase in the stability. The long-term activity of the promoted catalyst was dependent upon the rapid redox properties between the oxidative zone and the reductive zone in a fluidized bed reactor. H2 temperature-programmed reduction （H2-TPR） and face reaction （TPSR） studies demonstrated that addition of the CeZrO2 resulted in an increase in the reducibility and oxygen transfer ability of the support, Ni/Ceo.5ZrO0.5O2-SiO2 showed improved redox properties compared with Ni/SiO2 due to a low-temperature reduction. X-ray diffraction （XRD） of the fresh and spent catalysts showed that the promoter enhanced the nickel dispersion and retarded metal particle growth during reaction at high temperature, and surface Ni was gradually oxidized by remaining O2, leading to Ni deactivation.
Bibliography:	TQ530 methane： reforming： Ni/Ce-ZrO,-SiO, catalyst： flnidized bed reactor： rare earths 11-2788/TF O623.11
ISSN:	1002-0721 2509-4963
DOI:	10.1016/S1002-0721(08)60265-3