Effects of co-adsorbed water on different bond cleavages involved in acetic acid decomposition on Pt (111)
- Oregon State University, Corvallis, OR (United States)
- Oregon State University, Corvallis, OR (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Acetic acid decomposition on Pt (111) in the presence of co-adsorbed water is a good model system for oxygenate decomposition on Pt (111) in aqueous phase, with application in hydrogen production and biomass conversion. Here, in this study, we present a density functional theory (DFT) theory calculation of how co-adsorbed water affects different bond cleavages of acetic acid decomposition on Pt (111). The presence of co-adsorbed water generally enhances O$$-$$H bond cleavage while inhibiting OC$$-$$O and OC$$-$$OH bond cleavage. The influence of co-adsorbed water on C$$-$$H bond cleavage varies the most and depends on the nature of the transition state and how co-adsorbed water stabilizes the initial and final state. Although these trends are useful as general guidance, they are not sufficient to predict the effect on a complex reaction network such as acetic acid decomposition on Pt (111) which has several parallel reaction paths with similar energies. In the absence of co-adsorbed water, the two lowest energy pathways are decarboxylation (DCX) and decarbonylation (DCN) pathways through a common CH2COO intermediate, in which the DCX pathway (C$$-$$H bond cleavage of CH2COO) is more favorable than DCN pathway (OC$$-$$O bond cleavage of CH2COO). In the presence of co-adsorbed water, the energy difference between Csingle bondH bond cleavage and OC$$-$$O bond cleavage of CH2COO increases, suggesting an increase in the favorability of acetic acid decarboxylation (formation of carbon dioxide) over acetic acid decarbonylation (formation of carbon monoxide) on Pt (111).
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)
- Grant/Contract Number:
- AC05-76RL01830
- OSTI ID:
- 2565864
- Report Number(s):
- PNNL-SA--208494
- Journal Information:
- Surface Science, Journal Name: Surface Science Vol. 756; ISSN 0039-6028
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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