CO₂ reforming of methane over Ni/Mg/Al/Ce mixed oxides

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• 作者：Carlos Enrique Daza ; Jaime Gallego ; Jorge André ; s Moreno ; Fanor Mondragó ; n ; Sonia Moreno ; Rafael Molina
• 关键词：Hydrotalcites ; Cerium ; CO₂ reforming of methane
• 刊名：Catalysis Today
• 出版年：2008
• 期刊代码：13_09205861
• 类别：ce
• 出版时间：April-June 2008
• 卷：133-135
• 期：Complete
• 页码：357-366
• 文件大小：1367 K

摘要

Ni/Mg/Al/Ce mixed oxides were synthesized by thermal decomposition of layered double hydroxide-type compounds, which were obtained by the coprecipitation method at constant pH. The effect of the Ni²⁺ and Ce³⁺ incorporation methods in the hydrotalcite-type structure was studied. The solids were characterized using chemical analysis by X-ray fluorescence (XRF), X-ray diffraction (XRD), thermogravimetric analysis (TGA–DTG), diffuse reflectance infrared spectroscopy (DRIFT), temperature programmed reduction (TPR-H₂), BET surface areas and scanning electron microscopy (SEM). The methane reforming reaction was carried out at 700 °C. The results demonstrate the formation of solids with mixed crystalline phases of NiO–MgO (periclase) type and CeO₂ (fluorite) as well as other types of reducible species. Catalysts with CH₄ conversions of 50–80%, CO₂ conversions of 80–90%, CO selectivities of 20–40%and H₂ of 18–30%and high stability under the reaction conditions were obtained. Cerium promotes the catalytic activity of this type of solids. The catalyst with the best activity was obtained by coprecipitation of Ni²⁺, Mg²⁺, Al³⁺ and Ce³⁺.