An in situ study using anomalous wide angle X-ray scattering and X-ray absorption spectroscopy of the catalytic system ZnAI2O4 supported on alumina

Article Abstract:

Details regarding a combined approach based on X-ray absorption spectroscopy (XAS), X-ray diffraction (XRD), transmission electron microscopy (TEM), and anomalous wide-angle X-ray scattering (AWAXS) is explained. This approach enables to obtain information on the cation distribution, the electron state of the metal atoms, and the size of metal oxide clusters for a highly dispersed spinel phase.

Zinc compounds

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Local atomic arrangement and electronic structure of nanocrystalline transition metal oxide determined by X-ray absorption spectroscopy

Article Abstract:

The local crystal structure and electronic configuration of transition metal in x-ray amorphous MnO2 and CrO2 nanocrystals were examined by using X-ray absorption (XAS) spectroscopy at Mn K and Cr K-edges. The Mn K-edge XAS study reveals that tetravalent manganese was stabilized in alpha-MnO2-type local atomic arrangement consisting of the intergrowth of edge- and corner-shaped MnO6 octahedra.

Usage, Transition metals, Absorption spectra

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Effect of boehmite crystallite size and steaming on alumina properties

Article Abstract:

Boehmite and pseudoboehmite were studied using X-ray powder diffraction, crystalline structure refinement, scanning electron microscopy, thermoanalysis and nitrogen atmosphere. Results indicated that steaming promoted crystal growth as water molecules favored migration of aluminum atoms and nitrogen adsorption-desorption isotherms of transitional aluminas.

All Other Miscellaneous Chemical Product and Preparation Manufacturing, Catalysts, Chemical preparations, not elsewhere classified

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