Reduction of copper in porous matrixes. Stepwise and autocatalytic reduction routes

Article Abstract:

The reduction of Cu(II) oxide species in siliceous matrixes of different porosity (MFI, FAU, MCM-48) and in alumosilicate MFI is analyzed by temperature-programmed reduction in hydrogen (TPR), by X-ray absorption fine structure and by transmission electron microscopy. The results indicate that hydrogen activation, which is a key step for the autocatalytic reduction mechanism, is not initiated unless the Cu metal nuclei formed exceed a critical size.

Germany, Analysis, Observations, X-ray spectroscopy, Transmission electron microscopes, Copper oxide, Copper oxides, Properties, Structure

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XPS and FTIR study of Ru/Al2O3 and Ru/TiO2 catalysts: reduction characteristics and interaction with methane-oxygen mixture

Article Abstract:

The redox behavior of Ru/Al2O3 and Ru/TiO2 was investigated using X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy methods. Results showed that the material on which Ru is supported greatly influences its chemical reaction. The Al2O3 was found to stablize Ru in ionic forms. Ru is more easily reduced to the metallic state on TiO2. Moreover, there was no reoxidation of the catalyst during treatment with simulated POX feed.

Oxidation-reduction reaction, Oxidation-reduction reactions, Metal catalysts, Fourier transform infrared spectroscopy, Complex compounds, Ruthenium, Coordination compounds

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Application of ultraviolet photoelectron spectroscopy in the surface characterization of polycrystalline oxide catalysts. 2. Depth variation of the reduction degree in the surface region of partially reduced V205

Article Abstract:

Surface characterization of polycrystalline oxide catalysts was undertaken using ultraviolent photoelectron spectroscopy.

Photoelectron spectroscopy, Silicon crystals

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