Deactivation studies of Fischer–Tropsch synthesis on nano-structured iron catalyst

✍ Scribed by Ali Nakhaei Pour; Mohammad Reza Housaindokht; Sayyed Faramarz Tayyari; Jamshid Zarkesh; Mohammad Reza Alaei

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 548 KB
• Volume: 330
• Category: Article
• ISSN: 1381-1169
• DOI: 10.1016/j.molcata.2010.07.010

✦ Synopsis

Deactivation kinetics of bulk and nano-structured microemulsion prepared iron catalysts were studied in Fischer-Tropsch synthesis (FTS), from fitting of data to a generalized power-law expression (GPLE), r d = k d (aa ∞ ) m . Conventional bulk iron catalyst was prepared by general bulk co-precipitation method and nano-structured iron catalyst was prepared by microemulsion method. A deactivation model involving parallel paths is proposed, i.e. simultaneous conversion of (a) atomic to polymeric to graphitic carbon and (b) active carbon-rich carbides to inactive carbon-poor carbides. Compositions of bulk iron phase and phase transformations of carbonaceous species during catalyst deactivation in FTS reaction were characterized by temperature-programmed surface reaction with hydrogen (TPSR-H 2 ), XRD and TEM techniques.