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• W2509898404 abstract "The formation and coupling of methylene upon dissociation of formaldehyde on reduced TiO2(110) are studied using variable temperature scanning tunneling microscopy (STM). In agreement with prior studies, formaldehyde preferably adsorbs on the bridging-bonded oxygen vacancy (VO) defect site. VO-bound formaldehyde couples with Ti-bound formaldehyde forming a diolate species, which appears as the majority species on the surface at 300 K. Here, STM images directly visualize a low-temperature coupling reaction channel. Two VO-bound formaldehyde molecules can couple and form Ti-bound species, which desorbs above ∼215 K. This coupling reaction heals both VO sites indicating the formation and the desorption of ethylene. We also directly observed the diffusion of methylene groups to nearby empty VO sites upon dissociation of the C–O bond in VO-bound formaldehyde, which suggests that the ethylene formation occurs via coupling of the methylene groups. Statistical analysis shows that the sum of visible reaction products on the surface can only account for a half of the consumption of the initial VO coverage, which further supports the desorption of the coupling reaction product, ethylene, after formaldehyde exposure between 215 and 300 K." @default.
• W2509898404 created "2016-09-16" @default.
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• W2509898404 date "2015-07-31" @default.
• W2509898404 modified "2023-09-25" @default.
• W2509898404 title "Low-Temperature Reductive Coupling of Formaldehyde on Rutile TiO₂(110)" @default.
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• W2509898404 doi "https://doi.org/10.1021/acs.jpcc.5b05639" @default.
• W2509898404 hasPublicationYear "2015" @default.
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