Oxidation of cobalt based Fischer–Tropsch catalysts as a deactivation mechanism

Autor:	P.J. van Berge, J. van de Loosdrecht, Sean Barradas, A.M. van der Kraan
Rok vydání:	2000
Předmět:	inorganic chemicals Inorganic chemistry chemistry.chemical_element Fischer–Tropsch process General Chemistry Catalysis Thermogravimetry chemistry Mössbauer spectroscopy Slurry Emission spectrum Cobalt oxide Cobalt
Zdroj:	Catalysis Today. 58:321-334
ISSN:	0920-5861
DOI:	10.1016/s0920-5861(00)00265-0
Popis:	The oxidation of supported cobalt based slurry bed Fischer–Tropsch catalysts by means of water was studied. Water is one of the Fischer–Tropsch reaction products and can probably cause oxidation and deactivation of a reduced cobalt catalyst. Model experiments using Mossbauer emission spectroscopy and thermogravimetry as well as realistic Fischer–Tropsch synthesis runs were performed. It was demonstrated that Mossbauer emission spectroscopy can successfully be applied to the investigation of high cobalt loading Fischer–Tropsch catalysts. Strong indications were found that oxidation of reduced cobalt catalysts occurs under realistic Fischer–Tropsch conditions. Mossbauer emission spectroscopy and thermogravimetry results showed that the oxidation depends on the PH2/PH2O ratio, and that oxidation proceeds to less than complete extents under certain conditions. The formation of both reducible and less reducible cobalt oxide species was observed, and the relative ratio between these species depends on the severity of the oxidation conditions.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4bb0f9137951f1333968a824ab6a46d9 https://doi.org/10.1016/s0920-5861(00)00265-0 Zobrazit plný text záznamu Full Text from ScienceDirect