In situ magnetometer study on the formation and stability of cobalt carbide in Fischer–Tropsch synthesis

Autor:	P.J. van Berge, E. van Steen, E. du Plessis, Michael Claeys, A.M. Saib, D.J. Moodley, Mark E. Dry
Rok vydání:	2014
Předmět:	inorganic chemicals Hydrogen Chemistry Metallurgy chemistry.chemical_element Fischer–Tropsch process Decomposition Catalysis Methane Carbide chemistry.chemical_compound Chemical engineering Physical and Theoretical Chemistry Selectivity Cobalt
Zdroj:	Journal of Catalysis. 318:193-202
ISSN:	0021-9517
DOI:	10.1016/j.jcat.2014.08.002
Popis:	While carbides are always present in iron-based Fischer–Tropsch synthesis, very little is known about the presence and the role of carbides in cobalt-based CO hydrogenation. Cobalt carbide, Co2C, has been reported in catalysts where operational upsets occurred and it is associated with low catalyst activity and increased methane selectivity. In this study, a novel in situ magnetometer was used to study the formation and the stability of cobalt carbide during the Fischer–Tropsch synthesis at fully relevant conditions. The formation of cobalt carbide was confirmed by means of in situ XRD and synchrotron XRD measurements. Cobalt carbide is relatively stable at typical reaction conditions, but a rapid decomposition into hcp cobalt occurs in hydrogen above 150 °C. Cobalt carbide formation is inversely proportional to the H2/CO ratio and the reaction temperature. However, the amounts of cobalt carbide formed are small and the impact on deactivation at realistic Fischer–Tropsch conditions should generally be negligible.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0c0315c16c4ce08b0542ffae29b22b02 https://doi.org/10.1016/j.jcat.2014.08.002 Zobrazit plný text záznamu Full Text from ScienceDirect