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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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Ni/CeO2-SiO2催化剂的制备、表征及其甲烷部分氧化制合成气性能
DOI: 10.1016/S1872-2067(12)60723-2, PP. 8-20
Keywords: 溶胶-凝胶法,铈-硅复合氧化物,负载型镍催化剂,甲烷部分氧化,合成气
Abstract:
？以硝酸亚铈（Ce（NO3）3·6H2O）和正硅酸四乙酯（C8H20O4Si）为前驱体，采用溶胶-凝胶法合成了系列具有大比表面积的xCeO2-（1-x）SiO2（x=0，0.25，0.50，0.75，1）复合氧化物载体，然后浸渍活性组分Ni制得用于甲烷部分氧化制合成气的Ni催化剂。运用N2物理吸附-脱附、X射线粉末衍射、扫描电镜、紫外-可见漫反射光谱、氢程序升温还原、氨程序升温脱附和热重等手段对所得催化剂的组织结构、还原性、表面酸性和积炭行为等进行了表征；同时考察了催化剂的组成、焙烧温度和反应时间等对催化剂在甲烷部分氧化制合成气中催化性能的影响。表征结果表明，该系列Ni/CeO2-SiO2催化剂具有大比表面积，CeO2晶粒较小，NiO的分散性好且易被还原，表面酸性弱，不容易积炭。当Ce/Si摩尔比为1：1，活性组分Ni的质量分数为10%，焙烧温度为700℃时，所制备的Ni/CeO2-SiO2催化剂表现出较好的稳定性、最高的CH4转化率（~84%）和对产物CO及H2的选择性（>87%）。
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