Cu/ZnO and Cu/ZnO/ZrO2 catalysts used for methanol steam reforming
[Display omitted] •Cu/Zn/Zr catalysts were prepared by conventional precipitation.•The catalyst precursor phase was aurichalcite.•Zr species were amorphous −like but affected the catalyst structure.•Zr promoter facilitated the exposition of large amounts of CuO crystallites. Cu/ZnO and Cu/ZnO/ZrO2 c...
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Published in | Molecular catalysis Vol. 454; pp. 55 - 62 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
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Elsevier B.V
01.07.2018
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Abstract | [Display omitted]
•Cu/Zn/Zr catalysts were prepared by conventional precipitation.•The catalyst precursor phase was aurichalcite.•Zr species were amorphous −like but affected the catalyst structure.•Zr promoter facilitated the exposition of large amounts of CuO crystallites.
Cu/ZnO and Cu/ZnO/ZrO2 catalysts were prepared by co-precipitation method and used in methanol steam reforming at 250 °C. The catalysts were characterized by N2 adsorption, X-ray diffraction (XRD), temperature-programmed reduction (TPR), H2 temperature-programmed desorption (H2-TPD), transmission electron microscopy (TEM), X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS). ZrO2 affect the textural, structural and morphological properties of the CuO/ZnO catalyst. ZrO2 nanoclusters or amorphous material was found in Zr-based catalyst which role was to prevent the CuO and ZnO crystallite growth causing a microstrain in Cu and Zn oxides lattice. This effect facilitated the formation of exposed CuO species, which were easier to reduce and favored the catalytic performance of Zr-based catalyst. Monoclinic ZrO2 found in Zr-based catalyst decrease the CO formation deeply because of the higher capacity of monoclinical ZrO2 to adsorbed CO. The Cu2O active site found in CuO/ZnO catalyst was not more efficient than active sites in Zr-based catalyst. The results confirmed that the interactions between Cu and ZnO/ZrO2 were different from those between Cu and ZnO. |
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AbstractList | [Display omitted]
•Cu/Zn/Zr catalysts were prepared by conventional precipitation.•The catalyst precursor phase was aurichalcite.•Zr species were amorphous −like but affected the catalyst structure.•Zr promoter facilitated the exposition of large amounts of CuO crystallites.
Cu/ZnO and Cu/ZnO/ZrO2 catalysts were prepared by co-precipitation method and used in methanol steam reforming at 250 °C. The catalysts were characterized by N2 adsorption, X-ray diffraction (XRD), temperature-programmed reduction (TPR), H2 temperature-programmed desorption (H2-TPD), transmission electron microscopy (TEM), X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS). ZrO2 affect the textural, structural and morphological properties of the CuO/ZnO catalyst. ZrO2 nanoclusters or amorphous material was found in Zr-based catalyst which role was to prevent the CuO and ZnO crystallite growth causing a microstrain in Cu and Zn oxides lattice. This effect facilitated the formation of exposed CuO species, which were easier to reduce and favored the catalytic performance of Zr-based catalyst. Monoclinic ZrO2 found in Zr-based catalyst decrease the CO formation deeply because of the higher capacity of monoclinical ZrO2 to adsorbed CO. The Cu2O active site found in CuO/ZnO catalyst was not more efficient than active sites in Zr-based catalyst. The results confirmed that the interactions between Cu and ZnO/ZrO2 were different from those between Cu and ZnO. |
Author | Sanches, S.G. da Silva, M.I. Pais Flores, J. Huertas |
Author_xml | – sequence: 1 givenname: S.G. surname: Sanches fullname: Sanches, S.G. – sequence: 2 givenname: J. Huertas surname: Flores fullname: Flores, J. Huertas – sequence: 3 givenname: M.I. Pais surname: da Silva fullname: da Silva, M.I. Pais email: isapais@puc-rio.br |
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Keywords | Methanol steam reforming Cu/Zn/Zr catalyst XANES EXAFS Hydrogen production |
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•Cu/Zn/Zr catalysts were prepared by conventional precipitation.•The catalyst precursor phase was aurichalcite.•Zr species were amorphous... |
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SubjectTerms | Cu/Zn/Zr catalyst EXAFS Hydrogen production Methanol steam reforming XANES |
Title | Cu/ZnO and Cu/ZnO/ZrO2 catalysts used for methanol steam reforming |
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