Abstract
Copper catalysts have been extensively studied for CO oxidation at low temperatures. Previous findings on the stability of such catalysts, on the other hand, revealed that they deactivated badly under extreme circumstances. Therefore, in this work, a series of KCC−1-supported copper oxide catalysts were successfully prepared by impregnation method, of which 5% CuO/KCC−1 exhibited the best activity: CO could be completely converted at 120 °C. The 5% CuO/KCC−1 catalyst exhibited better thermal stability, which is mainly attributed to the large specific surface area of KCC−1 that facilitates the high dispersion of CuO species, and because the dendritic layered walls can lengthen the movement distances from particle-to-particle, thus helping to slow down the tendency of active components to sinter. In addition, the 5% CuO/KCC−1 has abundant mesoporous and surface active oxygen species, which are beneficial to the mass transfer and promote the adsorption of CO and the decomposition of Cu+–CO species, thus improving the CO oxidation performance of the catalyst.
Highlights
Colorless, odorless, and tasteless carbon monoxide (CO) is a kind of toxic gas generated by the low combustion efficiency of the fuels from different sources of fuel combustion, such as vehicle exhaust emissions, cement plants, electricity plants, biomass combustion, etc. [1,2,3,4]
To understand the microscopic morphology of the catalysts, the as-prepared KCC−1 support and CuO/KCC−1 series catalysts were characterized by SEM, and the SEM
The morphology did not change significantly when KCC−1 was loaded with a small amount of CuO, but the morphology of the catalyst was disrupted when the loading of
Summary
Odorless, and tasteless carbon monoxide (CO) is a kind of toxic gas generated by the low combustion efficiency of the fuels from different sources of fuel combustion, such as vehicle exhaust emissions, cement plants, electricity plants, biomass combustion, etc. [1,2,3,4]. NP to to the the catalyst catalyst surface surface by by aa strong strong metal–support metal–support interaction interaction [26,27] Fact, this this sort sort of of confinement confinement can can significantly significantly reduce reduce sintering sintering of of the the active active NP’s. KCC−1)has hasbeen beenattractattracting ing attention attention as as aa support support with with good good sintering sintering resistance resistance [29,30] Basset and and his surface area area fibrous fibrousmesoporous mesoporoussilica silicananospheres nanosphereswith witha his colleagues colleagues synthesized high surface open-mouth spherical morphology [31],[31], consisting of dendritic silicasilica layerslayers presented awide wide open-mouth spherical morphology consisting of dendritic prein three.
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