Propane Dehydrogenation over Cobalt Aluminates: Evaluation of Potential Catalytic Active Sites Full article
| Journal |
Catalysts
ISSN: 2073-4344 |
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| Output data | Year: 2023, Number: 13, Article number : 1419, Pages count : 15 DOI: 10.3390/catal13111419 | ||
| Tags | propylene; propane dehydrogenation; cobalt catalysts; heterogeneous catalysis; reaction mechanism | ||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | Ministry of Science and Higher Education of the Russian Federation | 0239-2021-0009 |
Abstract:
Non-oxidative propane dehydrogenation (PDH) is becoming an increasingly important approach to propylene production, while cobalt-containing catalysts have recently demonstrated great potential for use in this reaction, providing efficiencies comparable to those of industrially employed Pt- and Cr-based catalytic systems. It is therefore essential to clarify the nature of their active sites, especially since contradictory opinions on this issue are expressed in the literature. In this study, efforts were made to determine the state of Co in cobalt aluminates (CoAl2O4-Al2O3) responsible for PDH under typical operating conditions (600 oC, 1 atm). It is shown that the catalyst with a low cobalt content (Co/Al = 0.1) ensured the highest selectivity to propylene, ca. 95%, while maintaining significant propylene conversion. The structural motifs such as cobalt oxide and metallic cobalt nanoparticles, in addition to tetrahedral Co2+ species in the CoAl2O4 spinel system, were evaluated as potential active-site ensembles based on the obtained catalytic performance data in combination with the XRD, H2-TPR, TEM and XPS characteristics of as-synthesized, spent and spent–regenerated catalysts. It is revealed that the most likely catalytic sites linked to PDH are the Co-oxide forms tightly covering alumina or embedded in the spinel structure. However, additional in situ tuning is certainly needed, probably through the formation of surface oxygen vacancies rather than through a deeper reduction in Co0 as previously thought.
Cite:
Chernov A.N.
, Cherepanova S.V.
, Gerasimov E.Y.
, Prosvirin I.P.
, Zenkovets G.A.
, Shutilov A.A.
, Gorbunova A.S.
, Koltunov K.Y.
, Sobolev V.I.
Propane Dehydrogenation over Cobalt Aluminates: Evaluation of Potential Catalytic Active Sites
Catalysts. 2023. N13. 1419 :1-15. DOI: 10.3390/catal13111419 WOS Scopus РИНЦ AN OpenAlex
Propane Dehydrogenation over Cobalt Aluminates: Evaluation of Potential Catalytic Active Sites
Catalysts. 2023. N13. 1419 :1-15. DOI: 10.3390/catal13111419 WOS Scopus РИНЦ AN OpenAlex
Dates:
| Submitted: | Oct 12, 2023 |
| Accepted: | Nov 3, 2023 |
| Published print: | Nov 6, 2023 |
| Published online: | Nov 6, 2023 |
Identifiers:
| Web of science: | WOS:001107891800001 |
| Scopus: | 2-s2.0-85178261950 |
| Elibrary: | 55927607 |
| Chemical Abstracts: | 2023:2493145 |
| OpenAlex: | W4388407744 |