Effects of Ce/Zr ratio on the structure and performances of Co-Ce_(1-x)Zr_xO_2 catalysts for carbon dioxide reforming of methane |
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摘 要: | The Co-incorporated Ce1-xZrxO2 catalysts were prepared by co-precipitation for carbon dioxide reforming of methane. The ratio of Ce to Zr was varied to optimize the performances of co-precipitated Co-Ce-Zr-Ox catalysts. The prepared catalysts were characterized by various physico-chemical characterization techniques including TPR, X-ray diffraction, N2 adsorption at low temperature, XPS and CO2-TPSR. The co-precipitated Co-Ce0.8Zr0.2O2 sample containing 16% CoO exhibited a higher catalytic activity among the five catalysts, and the activity was maintained without significant loss during the reaction for 60 h. Under the conditions of 750 ℃, 0.1 MPa, 36000 ml/(h·g{cat}), and CO2/CH4 molar ratio of 1 : 1, the CO2 conversion over this catalyst was 75% while the CH4 conversion was 67%. The cubic Ce0.8Zr0.2O2 facilitated a higher dispersion and a higher reducibility of the cobalt component, and the apparent activation energy for Co-Ce0.8Zr0.2O2 sample was 49.1 kJ/mol in the CO2/CH4 reforming reaction. As a result, the Co-Ce0.8Zr0.2O2 sample exhibited a higher activity and stability for the reforming of CH4 with CO2.
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关 键 词: | 二氧化锆 二氧化碳重整 铈 物理化学特性 催化活性 X射线衍射 表观活化能 催化剂 |
收稿时间: | 27 August 2009 |
Effects of Ce/Zr ratio on the structure and performances of Co-Ce1-xZrxO2 catalysts for carbon dioxide reforming of methane |
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Authors: | Ning Wang Wei Chu Liqiong Huang Tao Zhang |
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Institution: | [1]Department of Architecture and Environment, Sichuan University, Chengdu 610065, Sichuan, China [2]Department of Chemical Engineering, Sichuan University, Chengdu 610065, Sichuan, China [3]Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China |
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Abstract: | The Co-incorporated Ce1-xZrxO2 catalysts were prepared by co-precipitation for carbon dioxide reforming of methane.The ratio of Ce to Zr was varied to optimize the performances of co-precipitated Co-Ce-Zr-Ox catalysts.The prepared catalysts were characterized by various physico-chemical characterization techniques including TPR,X-ray diffraction,N2 adsorption at low temperature,XPS and CO2-TPSR.The co-precipitated Co-Ce0.8Zr0.2O2 sample containing 16% CoO exhibited a higher catalytic activity among the five... |
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Keywords: | Ce1-xZrxO2 carbon dioxide methane dry reforming Co-incorporated catalyst characterization |
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