Journal
MOLECULAR CATALYSIS
Volume 454, Issue -, Pages 55-62Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.mcat.2018.05.012
Keywords
Cu/Zn/Zr catalyst; Methanol steam reforming; XANES; EXAFS; Hydrogen production
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Cu/ZnO and Cu/ZnO/ZrO2 catalysts were prepared by co-precipitation method and used in methanol steam reforming at 250 degrees C. The catalysts were characterized by N-2 adsorption, X-ray diffraction (XRD), temperature programmed reduction (TPR), H-2 temperature-programmed desorption (H-2-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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