Studies of the Fischer--Tropsch synthesis. XII. Composition changes of nitrided iron catalysts during the synthesis

Journal Article · Tue Feb 05 04:00:00 EST 1952 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja01123a016· OSTI ID:5344684

Shultz, J F; Seligman, B; Lecky, J; Anderson, R B

Changes in the composition of nitrided iron catalysts during use in the Fischer-Tropsch synthesis at 7.8 and 21.4 atmospheres operating pressure are described. The epsilon-nitrides are slowly converted to epsilon-carbonitrides, the rate of replacement of nitrogen by carbon being somewhat more rapid at 21.4 than at 7.8 atmospheres. At the lower operating pressure, oxidation and deposition of elemental carbon proceed at a very slow rate, whereas at 21.4 atmospheres these reactions are considerably more rapid in some catalysts. At the higher pressure, the type of structural promoter appears to be important in determining the rates of oxidation and of deposition of free carbon. When used nitrided catalysts are treated with hydrogen, the nitrogen is almost completely removed whereas the carbon content is not greatly changed. A part of the carbon appears either as Hagg carbide or as cementite depending upon the temperature of hydrogenation.

• Research Organization: Bureau of Mines, Pittsburgh
• OSTI ID: 5344684
• Journal Information: J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 74; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
CARBONITRIDES
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL REACTIONS
FISCHER-TROPSCH SYNTHESIS
IRON COMPOUNDS
IRON NITRIDES
NITRIDES
NITROGEN COMPOUNDS
PHASE STUDIES
PNICTIDES
TRANSITION ELEMENT COMPOUNDS