| Abstract |
The selectivity of syngas-to-C2 oxygenates still faces a big challenge. In the present study, the different 2D carbon-based substrates (g-C3N4, GDY and C2N) supported diatomic RhCo catalysts are constructed reasonably to enhance C2 oxygenates selectivity. The complicated reaction network is studied by means of DFT calculations; the influences of the species coverage, the reaction temperature and pressure are examined using microkinetic modeling. The results indicate that RhCo/g-C3N4, RhCo/GDY and RhCo/C2N catalysts have excellent structural stability. The preferred existence form of CHx(x = 1–3) monomer, as well as the activity and selectivity of CHx monomer and C2 oxygenates generation are strongly related to the coordination environment of 2D carbon-based material supported diatomic RhCo catalysts. The screened RhCo/g-C3N4 catalyst could perform the outstanding catalytic performance toward the generation of C2 oxygenates CH2CO and CH3CO, in which the coordination environment of g-C3N4 makes the diatomic RhCo cluster lose more electron and d-band center far away from Fermi level. This work provides an alternative way to construct 2D substrate supported diatomic metal catalysts in syngas-to-C2 oxygenates, adjusting 2D substrate type could change the local coordination environment of diatomic metal sites and further improve catalytic performance. |
| Authors |
Wen Zhao  , Zehai Chang , Maohong Fan  , Qianqian Wang , Riguang Zhang
|
| Journal Info |
Elsevier BV | Fuel , vol: 342
, pages: 127858 - 127858
|
| Publication Date |
6/1/2023 |
| ISSN |
0016-2361 |
Type |
article |
| Open Access |
closed
|
| DOI |
https://doi.org/10.1016/j.fuel.2023.127858 |
| Keywords |
Metal-Support Interactions (Score: 0.492311)
|
