Mechanistic Insights into Nonoxidative Ethanol Dehydrogenation on NiCu Single-Atom Alloys

Patel, Dipna A.; Giannakakis, Georgios; Yan, George; Ngan, Hio Tong; Yu, Peng; Hannagan, Ryan T.; Kress, Paul L.; Shan, Junjun; Deshlahra, Prashant; Sautet, Philippe; Sykes, E. Charles H.

doi:10.1021/acscatal.3c00275

Title: Mechanistic Insights into Nonoxidative Ethanol Dehydrogenation on NiCu Single-Atom Alloys

Journal Article · Tue Mar 14 00:00:00 EDT 2023 · ACS Catalysis

DOI:https://doi.org/10.1021/acscatal.3c00275· OSTI ID:1996123

Patel, Dipna A. ^[1]; Giannakakis, Georgios ^[1]; Yan, George ^[2]; Ngan, Hio Tong ^[2]; Yu, Peng ^[1];

^[1]; Kress, Paul L. ^[1];

^[1];

^[2];

^[1]

Tufts University, Medford, MA (United States)
University of California, Los Angeles, CA (United States)

Ethanol dehydrogenation presents a promising pathway towards the production of acetaldehyde, a valuable building block in chemicals production. Under non-oxidative conditions, the reaction is facilitated by supported Cu nanoparticles which afford reasonable activity and high selectivity. The stability issues associated with Cu nanoparticle sintering can be addressed by the addition of small amounts of Ni, which further boost reactivity while retaining selectivity. Despite the promise of NiCu single-atom alloys for non-oxidative ethanol dehydrogenation, little is known about the role of each component and the pathway of this mechanistically complex process. Herein, kinetic investigations from reactor tests identify C-H bond scission as the rate limiting step, while 1-hydroxyethyl is detected as the intermediate via IR spectroscopy. Temperature program desorption studies are employed to examine the effect of Ni coverage and to demonstrate that Ni atoms activate ethanol selectively at lower temperatures, resulting in higher acetaldehyde yield than pure Cu. Temperature program desorption experiments also reveal the spillover of intermediates from the Ni atom to neighboring Cu sites as a relevant step in the reaction pathway. Density functional theory calculations are used to investigate the 2 reaction energetics and to confirm that C-H bond scission is the initial reaction step, while a clear effect of H₂ partial pressure on the reaction pathway is realized. Further, counter to the expected behavior that all reaction steps take place on the Ni atoms, our degree of rate control analysis reveals that a mechanism involving spillover of the 1-hydroxyethyl intermediate from the Ni atom to the Cu surface, where it will dehydrogenate further, is more likely. Furthermore, our combined kinetic, spectroscopic, and theoretical approach sheds light on this complex reaction mechanism and represents a promising method for the understanding and designing of highly active, selective, and stable single-atom alloys for other multistep catalytic processes.

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Research Organization:: Harvard Univ., Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: SC0012573; SC0004738; ACI-1548562; TG-CHE170060

OSTI ID:: 1996123

Journal Information:: ACS Catalysis, Vol. 13, Issue 7; ISSN 2155-5435

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Mechanistic Insights into Nonoxidative Ethanol Dehydrogenation on NiCu Single-Atom Alloys

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