Crystal facet effect of γ-Al2O3 on catalytic property of CuO/γ-Al2O3 for CO oxidation

CuO/TiO2/Ti Monolithic Catalysts for Low-Temperature CO Oxidation

“…12−14 Among them, copper (Cu) and Cubased nanomaterials are more suitable for CO oxidation due to their low-temperature multiple oxidation states, such as cuprous oxide (Cu 2 O) and copper oxide (CuO). 15,16 In the recent past, high-performance CuO-based powder catalysts have been synthesized successfully by tailoring the exposed crystal planes, particle size, interface effects, and phase composition. 17−19 Moreover, a specific catalytic process and mechanism have been reported in the literature.…”

“…Also, the CO oxidation process is a representative model of oxidation reaction in heterogeneous catalysis, which makes it a probe reaction for in-depth mechanism investigations. , Consequently, it is of great significance to develop high-performance catalysts for removing CO gas. , For currently available efficient catalysts, it has been confirmed that noble metals such as Au, Pt, and Pd (with vacant d-orbital and diverse coordination modes) exhibit excellent CO oxidation performance. − Nevertheless, the abovementioned catalysts are not suitable for scalable manufacturing due to their high cost. In contrast, transition metal oxides have the advantages of low cost, excellent redox ability, relatively mature controllable synthesis path, etc., which make them more competitive for practical applications. − Among them, copper (Cu) and Cu-based nanomaterials are more suitable for CO oxidation due to their low-temperature multiple oxidation states, such as cuprous oxide (Cu 2 O) and copper oxide (CuO). , In the recent past, high-performance CuO-based powder catalysts have been synthesized successfully by tailoring the exposed crystal planes, particle size, interface effects, and phase composition. − Moreover, a specific catalytic process and mechanism have been reported in the literature. For example, Yan et al reported a Langmuir–Hinshelwood (L–H) mechanism, which is promoted by surface hydroxyls of the CuO/SiO 2 –AlOOH catalyst wherein O 2 adsorbs on the surface Cu 2+ sites.…”