A Novel Method for Measuring Active Sites of Fe3O4 for WGS Reaction

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• 作者：Xueqin J. Wang (1)
  Jennifer Renn (1)
  Jason Spencer (1)
  Chandra Ratnasamy (1)
  Yeping Cai (1)
  
• 关键词：Water gas shift ; Magnetite ; N2O decomposition ; Pulse chromatographic method
• 刊名：Topics in Catalysis
• 出版年：2013
• 出版时间：December 2013
• 年：2013
• 卷：56
• 期：18-20
• 页码：1899-1905
• 全文大小：
• 作者单位：Xueqin J. Wang (1)
  Jennifer Renn (1)
  Jason Spencer (1)
  Chandra Ratnasamy (1)
  Yeping Cai (1)
  
  1. Clariant Corporation, BU Catalysts, R&D Center, P.O. Box 32370, Louisville, KY, 40232, USA
  
• ISSN：1572-9028

文摘

Phase transformation among iron oxides was investigated. Pure magnetite material was obtained by reducing iron oxide with diluted hydrogen in a narrow temperature window and with steam to prevent over-reduction. A pulse chromatographic method with N2O decomposition over magnetite surface to determine active sites of iron oxide based catalysts for water gas shift reaction has been developed. N2O decomposes over activated Fe3O4 surface to N2 and leaves oxygen species at oxygen vacancy on the catalyst surface, which is the same site for water gas shift reaction. Lower temperature for N2O decomposition is required to avoid magnetite bulk oxidation. An oxygen coverage on the active sites =1 corresponded to a surface stoichiometry of N2O/Fe2+=0.5 was estimated. A linear correlation between water gas shift reaction rate and the quantity of decomposed N2O over the corresponded catalysts was observed.