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Cu‐based catalyst has been widely used for catalytic reduction of NO. Well‐defined TiOx/Cu(110) films were prepared and investigated by in situ reflection absorption infrared spectroscopy (IRAS), Auger electron spectroscopy (AES) and low energy electron diffraction (LEED). A complex surface structure of Cu+(‐O‐Ti‐)‐O‐Cuδ+/Cu(110) was proposed, in which the topmost surface Cu+ is highly dispersed, isolated and fixed by the TiOx layer. Such a ‘single atom’‐like surface site appears a very narrow νCO peak at 2130 cm–1, and is more stable upon both CO reduction and vacuum annealing than the Cu2O/Cu(110). Such isolated Cu+(‐O‐Ti‐) site on TiOx/Cu(110) is also fairly stable in NO+CO reaction, but the overall catalytic activity is slightly lower than that on the Cu(110) surface, indicating that the single‐atom Cu+(‐O‐Ti‐) site is less efficient for NO+CO reaction at the examined conditions. The study provides useful information for the design and application of single‐atom catalysts and understanding the nature of catalytically active centers.
Chinese Journal of Chemistry – Wiley
Published: Jun 1, 2022
Keywords: Copper; Nitrogen oxides; IR spectroscopy; Single‐atom Cu +; TiO x thin film
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