Optimum Balance of Cu⁺ and Oxygen Vacancies of CuO_x‐CeO₂ Composites for CO Oxidation Based on Thermal Treatment

Abstract

It is important to exploit non‐noble metal catalysts with excellent performance toward CO oxidation. Here, CuOx‐CeO2 composites with a size of about 4 nm have been fabricated by a facile and mild in situ route without solvent or liquid reactant involved. The balance between Cu+ concentration and oxygen vacancy on the CeO2 surface, which are beneficial for catalytic activity, can be tailored by the amount of Cu loading and the thermal treatment parameters of composites. The as‐obtained CuOx‐CeO2 (C‐9‐6‐C) composites with lower Cu loading exhibited excellent CO reactivity and superior stability at lower temperatures, which enable the total oxidation of CO at 110 °C. Appropriate heat treatment promoted the available migration of Cu species from the surface to the interior of the CeO2 lattice, which guaranteed the existence of affluent oxygen vacancies. The enhanced activity of CuOx‐CeO2 composites can be attributed to the preservation of highly dispersed Cu+ species and oxygen vacancies on the surface of CeO2. Hopefully, the CuOx‐CeO2 nanohybrids prepared by this facile and mild route can be used as a promising potential catalyst for CO oxidation with high efficiency and long life.

The Synthesis of SiO2@AuAg@CeO2 Sandwich Structures with Enhanced Catalytic Performance Towards CO Oxidation

“…The difference in catalytic performance between SACs and AuAu/SiO 2 may derive from the strong synergistic effect from the CeO 2 shell. As a typical reducible support with oxygen storage capability, CeO 2 with abundant oxygen vacancy defects can adjust the Ce 3+ /Ce 4+ ratio depending on the redox conditions . And the CeO 2 shell with excellent redox and oxygen storage capability facilitates the CO oxidation process.…”

Low temperature oxidation of CO using alkali- and alkaline-earth metal-modified ceria-supported metal catalysts: a review

“…Furthermore, Liu et al [52] observed the maximum CO oxidation activity of Cu x -CeO 2 catalyst due to strong interaction between CuOx and CeO 2 . The optimum amount of Cu doping on CeO 2 and its calcination temperature showed significant effect on catalytic performance than pure CeO 2 .…”

Solid-State Construction of CuOx/Cu1.5Mn1.5O4 Nanocomposite with Abundant Surface CuOx Species and Oxygen Vacancies to Promote CO Oxidation Activity

“…In the past few decades, many transition metal oxide catalysts have been developed, mainly including CeO 2 [ 13 , 21 , 22 ], MnO 2 [ 23 , 24 , 25 ], Co 3 O 4 [ 26 , 27 , 28 ], CuO [ 29 , 30 , 31 ], Fe 2 O 3 [ 32 , 33 , 34 ] et al, Co 3 O 4 -CeO 2−x [ 16 , 35 ], Cu-Mn [ 36 ], Ce-Cu [ 37 , 38 ], and Ce-Mn [ 39 , 40 ] composite oxides. Different active metals and carriers will result in different interactions between metals and carriers and different exposed active sites, thus making them have different reactivity for CO catalytic oxidation.…”