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Identification of carbon species on iron-based catalysts during Fischer-Tropsch synthesis
| Content Provider | Semantic Scholar |
|---|---|
| Author | Peña, Diego Cognigni, Andrea Neumayer, Thomas Beek, Wouter Van Jones, Debra S. Quijada, Melesio Rønning, Magnus |
| Copyright Year | 2018 |
| Abstract | Abstract This paper focuses on the use of in situ and ex situ characterisation techniques to provide evidences of carbon species on a commercial iron-based Fischer-Tropsch synthesis catalyst as well as other indices of potential deactivation mechanisms. In situ XANES measurements demonstrate that re-oxidation or transformation of the active iron phase, i.e. the Hagg carbide phase, was not a significant deactivation mechanism at the studied conditions. Sintering of Hagg carbide nanoparticles is significant with increasing temperatures and time on stream. The sintering mechanism is proposed to be a hydrothermally-assisted process. In situ DRIFTS indicates the presence of different carbon species on the catalyst surface such as aliphatic hydrocarbons from wax products and oxygenate compounds such as alcohols, aldehydes/ketones and carboxylate species. Carboxylate species are resistant towards hydrogenation at 280 °C. The presence of different carbon species on the surface after wax product extraction is evident from TPH-MS measurements. GC-MS analysis shows that the strongly adsorbed carbon species remaining on the catalyst surface from wax products are mainly α-olefins and branched carboxylic species. The interaction of oxygenate compounds, especially carboxylate species with iron oxide, may form stable complexes limiting further iron catalyst carburization. STEM-EDX analysis shows that carbon is preferentially located on iron particles. |
| Starting Page | 10 |
| Ending Page | 23 |
| Page Count | 14 |
| File Format | PDF HTM / HTML |
| DOI | 10.1016/j.apcata.2018.01.019 |
| Alternate Webpage(s) | https://ntnuopen.ntnu.no/ntnu-xmlui/bitstream/handle/11250/2483113/Carbon+species+on+FeFT_revised.pdf?isAllowed=y&sequence=2 |
| Alternate Webpage(s) | https://doi.org/10.1016/j.apcata.2018.01.019 |
| Volume Number | 554 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
