期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 125, 期 13, 页码 7227-7239出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.1c00991
关键词
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资金
- US Department of Energy, Office of Sciences, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences Biosciences
- Department of Energy's Office of Biological and Environmental Research
The reaction pathways of glycerol on TiO2(110) involve the production of water, hydrogen, and carbon-containing products, with the C-H bond scission channel identified as the primary pathway for hydrogen evolution. The study also suggests that smaller oxygenates are not suitable models for probing the reaction pathways of larger oxygenates on oxide surfaces.
The reaction pathways of glycerol on TiO2(110) have been studied by molecular beam dosing and temperature-programmed desorption. The majority of adsorbed glycerol undergoes reactions to yield water, hydrogen, and carbon-containing products. For both water and hydrogen, we identify two distinct reaction channels resulting from the cleavage of O-H and C-H bonds. Quantification of the desorption yields reveals that the C-H bond scission channel, observed at temperatures higher than for the O-H bond scission, is a dominant reaction channel for hydrogen evolution. For the carbon-containing products, we identify gaseous allyl radical as the major product. Various minor carbon-containing products, including propylene, acrolein, allyl alcohol, acetone, formaldehyde, and ethylene, are also observed and quantified. The different surface chemistries observed between glycerol and simpler alcohols and glycols on TiO2(110), suggest that smaller oxygenates cannot serve as models for larger oxygenates in probing their reaction pathways on oxide surfaces.
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