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- Title
Imaging of Formaldehyde Adsorption and Diffusion on TiO(110).
- Authors
Zhang, Zhenrong; Tang, Miru; Wang, Zhi-Tao; Ke, Zhu; Xia, Yaobiao; Park, Kenneth; Lyubinetsky, Igor; Dohnálek, Zdenek; Ge, Qingfeng
- Abstract
Surface reactions of formaldehyde with reduced TiO(110) surfaces have been studied using variable-temperature scanning tunneling microscopy (STM) and density functional theory (DFT). STM images taken from a same area at various temperatures clearly show that formaldehyde preferentially adsorbs on the bridge-bonded oxygen (O) vacancy (V) defect sites. Bias-dependent STM images show that the STM features corresponding to both the Ti-bound CHO and the V-bound CHO are positioned between the O row and the Ti row. While the V-bound formaldehyde rotates at 95 K, the Ti-bound CHO does not. The V-bound CHO starts to diffuse along the O row as -CH- at ~170 K and starts to diffuse along the Ti row as an intact molecule at ~215 K. However, the stabilities and the configurations of the Ti-bound and V-bound formaldehyde calculated using DFT are not in line with the experimental results. The discrepancy between the experiment and theory indicates the presence of a complex charge distribution related to the surface defects.
- Subjects
TITANIUM oxides; METAL absorption &; adsorption; FORMALDEHYDE; SURFACE reactions; SCANNING tunneling microscopy
- Publication
Topics in Catalysis, 2015, Vol 58, Issue 2/3, p103
- ISSN
1022-5528
- Publication type
Article
- DOI
10.1007/s11244-014-0349-6