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Reaction of SO2 with Cu/TiO2(1 1 0): Effects of size and metal-oxide interactions in the chemical activation of Cu nanoparticles by Xueying Zhao; J. Hrbek; J.A. Rodriguez; M. Pérez is a Physics and Astronomy article available to read on EtoBox.

What is Reaction of SO2 with Cu/TiO2(1 1 0): Effects of size and metal-oxide interactions in the chemical activation of Cu nanoparticles about?

The reaction of SO 2 with stoichiometric TiO 2 (1 1 0), partially reduced TiO 2 À x (1 1 0) and Cu/TiO 2 (1 1 0) was investigated using synchrotron based X-ray photoemission spectroscopy. SO 2 adsorbs on perfect TiO 2 (1 1 0) forming SO 4 species at room temperature, while SO 2 dissociatively adsorbs on partially reduced TiO 2 À x (1 1 0) forming SO 4 , SO 3 as well as two sulfide species. SO 2 exposure to Cu particles supported on perfect TiO 2 (1 1 0) can lead to the formation of SO 4 , SO 3 and sulfide species. When depositing Cu on SO 4 /TiO 2 (1 1 0) at room temperature, the dissociation efficiency of Cu atoms is much higher than that of Cu deposited on TiO 2 (1 1 0) prior to SO 2 dosing. The post-deposited Cu atoms can efficiently contact and react with SO 4 species before they form Cu-Cu bonds and big clusters. Small Cu nanoparticles supported on TiO 2 (1 1 0) are more reactive towards SO 2 than surfaces of bulk copper. The chemical reactivity of the Cu/ TiO 2 (1 1 0) system increases with Cu coverage until reaching a maximum at h Cu = 0.5-0.8 ML. After this point, an increase in Cu coverage leads to the formation of big Cu particles and the reactivity of the system decrease

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Author

Xueying Zhao; J. Hrbek; J.A. Rodriguez; M. Pérez

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0039-6028)

Published

2006

Language

EN

Field

Physics and Astronomy (Physical Sciences)