Hydrocracking of Octacosane and Cobalt Fischer–Tropsch Wax over Nonsulfided NiMo and Pt-Based Catalysts
| dc.contributor.author | Ma, Wenping | |
| dc.contributor.author | Kang, Jungshik | |
| dc.contributor.author | Jacobs, Gary | |
| dc.contributor.author | Hopps, Shelley D. | |
| dc.contributor.author | Davis, Burtron H. | |
| dc.date.accessioned | 2021-12-23T15:06:19Z | |
| dc.date.available | 2021-12-23T15:06:19Z | |
| dc.date.issued | 2021-09-30 | |
| dc.date.updated | 2021-12-23T15:06:20Z | |
| dc.description.abstract | The effect of activation environment (N2, H2 and H2S/H2) on the hydrocracking performance of a NiMo/Al catalyst was studied at 380 °C and 3.5 MPa using octacosane (C28). The catalyst physical structure and acidity were characterized by BET, XRD, SEM-EDX and FTIR techniques. The N2 activation generated more active nonsulfided NiMo/Al catalyst relative to the H2 or H2S activation (XC28, 70–80% versus 6–10%). For a comparison, a NiMo/Si-Al catalyst was also tested after normal H2 activation and showed higher activity at the same process conditions (XC28, 81–99%). The high activity of the NiMo/Al (N2 activation) and NiMo/Si-Al catalysts was mainly ascribed to a higher number of Brønsted acid sites (BAS) on the catalysts. The hydrocracking of cobalt wax using Pt/Si-Al and Pt/Al catalysts confirmed the superior activity of the Si-Al support. A double-peak product distribution occurred at C4–C6 and C10–C16 on all catalysts, which illustrates secondary hydrocracking and faster hydrocracking at the middle of the chain. The nonsulfided NiMo/Al and Pt/Al catalysts, and NiMo/Si-Al catalyst produced predominantly diesel (sel. 50–70%) and gasoline range (sel. > 50%) hydrocarbons, respectively, accompanied by some CH4 and light hydrocarbons C2–C4. On the other hand, the hydrocarbon distribution of the Pt/Si-Al varied with conditions (i.e., diesel sel. 87–90% below 290 °C or gasoline sel. 60–70% above 290 °C accompanied by little CH4) The dependence of the isomer/paraffin ratio on chain length was studied as well. The peak iso/paraffin value was observed at C10–C13 for the SiAl catalyst. | |
| dc.description.department | Biomedical Engineering and Chemical Engineering | |
| dc.description.department | Mechanical Engineering | |
| dc.identifier | doi: 10.3390/reactions2040024 | |
| dc.identifier.citation | Reactions 2 (4): 374-390 (2021) | |
| dc.identifier.uri | https://hdl.handle.net/20.500.12588/775 | |
| dc.rights | Attribution 4.0 United States | |
| dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | |
| dc.subject | hydrocracking | |
| dc.subject | isomerization | |
| dc.subject | N2 activation | |
| dc.subject | NiMo | |
| dc.subject | Pt | |
| dc.subject | Al2O3 (Al) | |
| dc.subject | SiO2-Al2O3 (Si-Al) | |
| dc.subject | octacosane | |
| dc.subject | Fischer–Tropsch wax | |
| dc.title | Hydrocracking of Octacosane and Cobalt Fischer–Tropsch Wax over Nonsulfided NiMo and Pt-Based Catalysts | |
| dc.type | Article |