Fabrication of CeZrO2 on Ni/SiO2 and promoted catalysis for methane autothermal reforming in a fluidized bed reactor
来源期刊：Journal of Rare Earths2009年第3期
论文作者：井强山 方林霞 楼辉 郑小明
文章页码：431 - 436
摘 要：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 temperature-programmed surface reaction（TPSR） studies demonstrated that addition of the CeZrO2 resulted in an increase in the reducibility and oxygen transfer ability of the support,Ni/Ce0.5ZrO0.5O2-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.
井强山1，方林霞1，楼辉2，郑小明2
1. Department of Chemistry and Chemical Engineering,Xinyang Normal University2. Institute of Catalysis,Zhejiang University
摘 要：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 temperature-programmed surface reaction（TPSR） studies demonstrated that addition of the CeZrO2 resulted in an increase in the reducibility and oxygen transfer ability of the support,Ni/Ce0.5ZrO0.5O2-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.
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