Catalytic properties of Ni modified hexaaluminates LaNiyAl12-yO19-δ for CO2 reforming of methane to synthesis gas
Catalytic properties of Ni modified hexaaluminates LaNiyAl12-yO19-δ for CO2 reforming of methane to synthesis gas
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DOI：
10.1016/s0926-860x(99)00518-9
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发表时间：
2000-05
影响因子：
5.5
通讯作者：
Zhan-lin Xu;Ming Zhen;Y. Bi;K. Zhen
中科院分区：
文献类型：
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作者：
Zhan-lin Xu;Ming Zhen;Y. Bi;K. Zhen
设计了一系列ni修饰的六铝酸盐LaNiyAl12−yO19−δ(y=0.3, 0.6, 0.9, 1.0)作为甲烷co2重整制合成气的催化剂。它们是由硝酸盐分解和高温煅烧制备的。将改性剂Ni作为活性组分嵌套在制备的六铝酸盐中，取代部分Al离子。采用x射线粉末衍射（XRD）、x射线光电子能谱（XPS）、程序升温还原（TPR）和热重分析（TGA）等技术对六铝酸盐的晶体结构和性能进行了表征。结果表明，纯六铝酸盐LaNiyAl12−yO19−δ相只能在0<y≤1时形成。还原的六铝酸盐LaNiyAl12−yO19−δ在高温下对主题反应表现出显著的催化活性和稳定性，这受到六铝酸盐晶格中改性剂Ni的敏感影响。在相同的反应条件下，ch4和co2的转化率随着改性剂Ni用量（y值）的增加而增加。
A series of Ni-modified hexaaluminates, LaNiyAl12−yO19−δ(y=0.3, 0.6, 0.9, 1.0), were designed as new catalysts for CO2reforming of methane to synthesis gas. They were prepared by decomposition of nitrates and calcination at high temperature. The modifier Ni as active component was inlayed in the prepared hexaaluminate to substitute part of Al ions. The crystalline structure and properties of the hexaaluminates were characterized using X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction (TPR) and thermogravimetric analysis (TGA) techniques. The results showed that a pure hexaaluminate LaNiyAl12−yO19−δphase could form only at 0<y≤1. The reduced hexaaluminates LaNiyAl12−yO19−δexhibited significant catalytic activities and stability for the topic reaction at high temperature, which were sensitively affected by the modifier Ni in the hexaaluminate lattices. Under the same reaction conditions, the conversions of CH4and CO2increased with an increase in the amount (y value) of the modifier Ni.