Tuning the hydrogenation of CO2 to lower olefins: Impact of Pt in K–doped Fe–Mn catalysts
Fe-based catalysts are promising for the hydrogenation of CO2 to olefins, contributing to the mitigation of CO2 emissions. Low-pressure conditions (∼1 MPa) are preferred for the selective synthesis of lower olefin because these conditions suppress carbon chain growth and olefin re-absorption which l...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-08-01
|
| Series: | Journal of CO2 Utilization |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2212982025001374 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Fe-based catalysts are promising for the hydrogenation of CO2 to olefins, contributing to the mitigation of CO2 emissions. Low-pressure conditions (∼1 MPa) are preferred for the selective synthesis of lower olefin because these conditions suppress carbon chain growth and olefin re-absorption which leads to hydrogenation of olefins to paraffins. In this study, K-doped Fe–Mn–Pt/Al2O3 catalysts that could react at 1 MPa were prepared, with a focus on the role and position of Pt active sites. K–Fe17Mn2/Pt1/Al2O3 was prepared by first supporting Pt on Al2O3 followed by Fe–Mn oxide; it exhibited the highest C2–5 olefin selectivity of 28 %. Pt promoted the reverse water-gas shift reaction, and in combination with Mn, facilitated iron oxide reduction and Fe5C2 formation, enhancing the C2–5 olefin selectivity. Compared with the Pt active sites in K–Pt1/Fe17Mn2/Al2O3, which was prepared by first supporting Fe–Mn oxide on Al2O3 followed by Pt, those in K–Fe17Mn2/Pt1/Al2O3 existed around the Fe–Mn active sites. Pt continued to contribute to the Fe species reduction and the stable supply of CO, leading to improved C2–5 olefin selectivity. |
|---|---|
| ISSN: | 2212-9839 |