Fig. 4

Structural characterization of various catalysts. a X-ray diffraction patterns (XRD) of ZnAlOx. b High-resolution transmission electron microscopy (TEM) image of ZnAlOx. Scale bar: 10 nm. c H2-TPR profiles. The relative intensity was normalized by weight. The relative intensity of the standard sample Ag2O was divided by 50. d FTIR subtraction spectra relative to adsorption of DTBPy