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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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SBA-15的孔壁碳膜修饰对钴基催化剂结构与催化性能的影响
DOI: 10.3724/SP.J.1088.2011.10319, PP. 1370-1375
Keywords: SBA-15分子筛,孔壁碳修饰,钴基催化剂,费托合成
Abstract:
？在惰性气体中焙烧SBA-15制得孔壁被碳修饰的SBA-15C样品,以它和SBA-15为载体,采用等量浸渍法制备了负载型Co基催化剂,并运用X射线衍射、N2物理吸附、程序升温还原、NH3吸附量热等手段对样品进行了表征.结果表明,SBA-15C仍保持原有的六方有序的中孔结构,但其孔壁经碳修饰后发生增厚,比表面积略有下降.Co的负载使得SBA-15和SBA-15C样品的孔径基本不变,但比表面积和孔体积下降,仍保持其中孔分子筛的特征.Co3O4在SBA-15C上的晶粒较小,但还原度较低,表明碳的存在有利于Co物种的分散.比较了Co/SBA-15和Co/SBA-15C上的费托合成反应性能,发现两者对C5+的选择性均较高(达80%左右),但Co/SBA-15C催化剂稳定性优于Co/SBA-15.
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