Fischer–Tropsch synthesis on potassium-modified Fe3O4 nanoparticles

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• 作者：Jae Min Cho ; Min Hye Jeong ; Jong Wook Bae
• 关键词：Fischer–Tropsch synthesis (FTS) ; Fe3O4 nanoparticles ; Potassium promoter ; Size effect of iron oxide ; Olefin selectivity
• 刊名：Research on Chemical Intermediates
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：42
• 期：1
• 页码：335-350
• 全文大小：742 KB
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• 作者单位：Jae Min Cho (1)
  Min Hye Jeong (1)
  Jong Wook Bae (1)
  
  1. School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon, Gyeonggi-do, 440-746, Republic of Korea
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Catalysis
  Physical Chemistry
  Inorganic Chemistry
  
• 出版者：Springer Netherlands
• ISSN：1568-5675

文摘

Synthesized magnetite (Fe₃O₄) nanoparticles, with an average crystallite size of 8 and 22 nm, were investigated for Fischer–Tropsch synthesis reaction to clarify the effects of iron crystallite size and a potassium promoter. The larger crystallite size of Fe₃O₄ without the potassium promoter showed an increased CO conversion with a lower selectivity of C₅+ and olefinic hydrocarbons. This was mainly attributed to the enhanced reduction degree and an abundance of active edge sites of cube-like morphology. However, a modification of Fe₃O₄ nanoparticles with the potassium promoter significantly changed the product distribution by increasing C₅+ and olefinic hydrocarbons with much higher CO conversions. The enhanced activity on the large crystallite size of K-modified Fe₃O₄ was mainly attributed to an enhanced secondary reaction of olefins formed on the active iron carbide sites. The positive effect of the potassium promoter was much significant on the larger Fe₃O₄ nanoparticles due to an abundant presence of potassium promoter on the outer surface of the large Fe₃O₄ nanoparticles with a bigger inter-particular pore diameter for an easy mass transport. Keywords Fischer–Tropsch synthesis (FTS) Fe₃O₄ nanoparticles Potassium promoter Size effect of iron oxide Olefin selectivity