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Title
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NO reduction with CO on metal nanoparticles/layered double hydroxides heterostructures obtained via the structural memory effect
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Author
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Abstract
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| 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. |
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Language
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English
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Source (journal)
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Catalysis today. - Amsterdam
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Publication
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Amsterdam
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2024
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ISSN
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0920-5861
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DOI
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10.1016/J.CATTOD.2023.114342
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Volume/pages
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425
(2024)
, p. 1-10
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Article Reference
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114342
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ISI
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001061796300001
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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