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Characterization of Cu and K containing Fe/Mn oxide catalysts for fischer‐tropsch synthesis
Author(s) -
Grzybek Teresa,
Klinik Jerzy,
Papp Helmut,
Baerns Manfred
Publication year - 1990
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.270130122
Subject(s) - catalysis , carbon monoxide , fischer–tropsch process , olefin fiber , chemistry , coprecipitation , chemisorption , inorganic chemistry , potassium , copper , oxide , syngas , selectivity , organic chemistry
Copper and potassium containing Fe/Mn oxide catalysts for Fischer‐Tropsch synthesis were investigated by X‐ray microprobe technique, scanning electron microscopy, low‐temperature argon sorption and carbon monoxide and carbon dioxide chemisorption at −80°C. The specific surface areas of the catalysts depend on the preparation method, e.g. addition of K or Cu by coprecipitation leads to an increase while impregnation results in a decrease in surface area. The resulting samples are inhomogeneous, as shown by all method. Mn and especially K accumulated on the surface of the catalysts. Addition of Cu and K considerably altered the selectivity and activity of the Fe/Mn oxide catalyst. High potassium contents produced high olefin to paraffin ratios but these catalysts became rapidly deactivated. Copper and a very small addition of potassium led to a very low olefin to paraffin ratio but showed a high and constant activity.