Ababei, Gabriel

Carja, Gabriela

Cool, Pegie

Gilea, Diana

Seftel, Elena Mihaela

Van Everbroeck, Tim

Abstract: Nitrogen oxides are notorious air pollutants and the catalytic reduction of NOx by CO for removing NOx has attracted extensive attention. Herein, we present a series of ZnCu-layered double hydroxides (LDH) decorated with nanoparticles of metals (Me: In, Zn or Au) and the derived oxides as novel catalysts for NO reduction by CO. MeNP/ZnCu heterostructures were successfully prepared by taking advantage of the structural reconstruction of ZnCu LDH, via the structural memory effect, in the aqueous solutions of Me salts. X-ray diffraction (XRD), FTIR spectroscopy, H2-Temperature programmed reduction (H2-TPR), transmission electron microscopy TEM, X-ray photoelectron spectroscopy (XPS), and UV-vis spectroscopy have been used to characterize the structural, chemical composition, optical and nano/micromorphology of MeNP/ZnCu catalysts and the mixed oxides derived after the thermal treatment. Results indicate that on MeNP/ZnCu the reduction of NO by CO was 3 times higher than that of ZnCu while CO conversion was above 90%. Further, MeNP/ZnCu and the derived oxides demonstrated good stability in subsequent catalytic cycles while NO conversion was influenced by the molar ratio O2/CO. These findings indicate that the memory effect of the LDH can be effective as a simple strategy in the development of novel LDH-based heterostructured catalysts

NO reduction with CO on metal nanoparticles/layered double hydroxides heterostructures obtained via the structural memory effect

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