| Title |
Mechanistic Pathways for the Dehydrogenation of Alkanes on Pt(111) and Ru(0001) Surfaces |
| ID_Doc |
27312 |
| Authors |
Islam, MM; Catlow, CRA; Roldan, A |
| Title |
Mechanistic Pathways for the Dehydrogenation of Alkanes on Pt(111) and Ru(0001) Surfaces |
| Year |
2024 |
| Published |
Chemcatchem, 16.0, 11 |
| DOI |
10.1002/cctc.202301386 |
| Abstract |
The dehydrogenation of alkanes is a critical process to enable olefin upcycling in a circular economy. A suitable selective catalyst is required in order to avoid demanding reaction conditions and ensure the activation of the C-H bond rather than breaking the C-C bond, which is the weaker of the two. Herein, using periodic density functional theory, we have investigated the dehydrogenation of n-pentane (as a model compound) on Pt and Ru surface catalysts. The results show that the first dehydrogenation occurs through the dissociative adsorption of the C-H bond, resulting in pentyl and H intermediates on the metal surfaces. A successive dehydrogenation creates pentene via a hydride di-sigma state, leaving the abstracted hydrogen atoms on the metal surfaces. In agreement with recent experiments, Pt and Ru catalysts show a similar reactivity trend: pentane dehydrogenation yields pent-1-ene and pent-2-ene. The simulations reveal that the 1st C-H dissociation is the rate-determining step, whereas the double-bonded alkenes (pent-1-ene and pent-2-ene) are formed due to fast successive dehydrogenation processes. Pt favors the formation of pent-1-ene, whereas Ru favors the formation of pent-2-ene. There is a growing awareness of the negative effects of plastic waste on the environment, leading to a shift towards a more sustainable "circular plastic economy." However, current recycling methods are limited by being primarily mechanical based, hindering the full realization of a truly circular plastics economy. In this paper, we explore a promising catalytic chemical recycling process that can convert polyolefins into olefins, offering new pathways for upcycling and contributing to the goal of a circular plastics economy. image |
| Author Keywords |
Heterogeneous Catalysis; Olefin; DFT; Plastic Upcycling; Circular Economy |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:001175923900001 |
| WoS Category |
Chemistry, Physical |
| Research Area |
Chemistry |
| PDF |
https://doi.org/10.1002/cctc.202301386
|