Sadeqzadeh, Majid; Chambrey, Stephane; Hong, Jingping; Fongarland, Pascal; Luck, Francis; Curulla-Ferre, Daniel; Schweich, Daniel; Bousquet, Jacques; Khodakov, Andrei Y.

Industrial & Engineering Chemistry Research (2014), 53(17), 6913-6922 CODEN: IECRED; ISSN: 0888-5885. English.

This paper focuses on the deactivation of a cobalt-based alumina-supported Fischer-Tropsch catalyst in a milli-fixed-bed reactor under different operating conditions. Different catalyst deactivation behaviors were observed at different syngas H2/CO ratios and temps. The deactivation follows a two-step profile, where the initial deactivation is attributed to sintering, whereas the long-term deactivation is due to carbon deposition or cobalt oxidation on the surface. An unsteady-state semimechanistic model has been developed to represent the data at different temps. and syngas ratios. This model takes into account cobalt sintering, coke deposition, and surface oxidation