Zirconia-supported MoO (sub x) catalysts for the selective oxidation of dimethyl ether to formaldehyde : structure, redox properties, and reaction pathways

Article Abstract:

Dimethyl ether reaction rates (per Mo atom) increase markedly with increasing MoOx surface density in the 2.2 to 6.4 Mo/nm (super 2) range as two-dimensional polymolybdate domains grow and ultimately form MoO (sub 3) clusters. The rates of reduction of these materials in H (sub 2) increase in parallel with increasing MoOx surface density, suggesting that redox cycles and kinetically relevant reduction steps are involved in dimethyl ether reactions and that the rate of such steps increases with increasing reducibility of MoOx domains.

All Other Basic Organic Chemical Manufacturing, Industrial organic chemicals, not elsewhere classified, Molybdenum, Methyl Ether, Zirconium oxide, Structure

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Structure and properties of cobalt-exchanged H-ZSM5 catalysts for dehydrocyclization of alkanes

Article Abstract:

The structure and the catalytic properties of Co-exchanges H-ZSM5 materials measured by combining temperature-programmed reduction, D2-OH isotopic exchange, and infrared measurements are described. Near-edge and fine structure analysis of XAS data showed the presence of well-dispersed Co2(super +) cations in all Co/H-ZSM5 samples, indicating the formation of similar exchanged species at all Co contents.

Cobalt, Analysis, Molecular structure, Chemical reactions, Atomic properties

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Structure and site evolution of iron oxide catalyst precursors during the Fischer-Tropsch synthesis

Article Abstract:

The in situ x-ray absorption spectroscopy was used to study the local structure and oxidation state of the starting Fe2O3 precursors promoted by Cu and K. The result suggests that the conversion of near-surface layers of Fe3O4 to FeC(sub x) is sufficient for the formation of the required active sites.

Usage, Oxidation-reduction reaction, Oxidation reduction reactions, Ferric oxide, Chemistry, Physical and theoretical, Physical chemistry, Absorption spectra, Chemical properties

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