NO Reduction on Cu‐Based Model Catalysts Studied by in‐situ IRAS. Issue 11 (28th February 2022)

• Record Type: Journal Article
• Authors: Huang, Wujun; Lin, Na; Xie, Xiuwen; Chen, Mingshu; Wan, Huilin
• Is Part Of: Chinese journal of chemistry. Volume 40:Issue 11(2022)
• Page Start: 1267
• Page End: 1274
• Publication Date: 2022-02-28
• Subjects: Copper -- Nitrogen oxides -- IR spectroscopy -- Single‐atom Cu+ -- TiOx thin film; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/cjoc.202100862
• Languages: English
• ISSNs: 1001-604X

Abstract

Comprehensive Summary: Cu‐based catalyst has been widely used for catalytic reduction of NO. Well‐defined TiO x /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‐Cu δ + /Cu(110) was proposed, in which the topmost surface Cu + is highly dispersed, isolated and fixed by the TiO x layer. Such a 'single atom'‐like surface site appears a very narrow ν CO peak at 2130 cm –1, and is more stable upon both CO reduction and vacuum annealing than the Cu2 O/Cu(110). Such isolated Cu + (‐O‐Ti‐) site on TiO x /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. Abstract : Single‐atom like Cu + (‐O‐Ti‐) site is less efficient for NO+CO reaction by L‐H mechanism.