Dec 1, 1992 · XAFS analyses revealed that Mo forms distorted octahedral (Oh) inner-sphere complexes on δ-MnO 2 whereas it forms a tetrahedral (Td) outer-sphere complex on ferrihydrite. In the hydrogenetic ferromanganese oxides, the dominant host phase of Mo was revealed to …

2 days ago · In situ X-ray absorption fine structure (XAFS) measurements demonstrated that the RWGS reaction is driven by reversible redox of in situ-formed MoO x suboxide, where the contiguous Mo--Mo species in MoO x act as activation sites for CO 2. Comprehensive analysis revealed that the MoO x shell surrounding the Pt nanoparticles (NPs) ...

Jan 18, 2023 · Detailed analysis of Mo K-edge XAFS data revealed that sulfidation evolves in two steps, where most of the oxide is converted into sulfide below 150 °C. No significant difference was observed in the Mo K-edge spectra measured at NiMo catalysts with different supports.

Mar 22, 2021 · Here, we report that CO 2 can dissociate at sulfur vacancies in MoS 2 nanosheets to yield surface-bound CO and O at room temperature, thus enabling a highly efficient low-temperature...

May 31, 2024 · Herein, we report that high catalytic performance for POM can be achieved by the regulation of O* occupation in the atomically dispersed (AD) MoNi alloy, with over 95% CH 4 conversion and 97%...

Oct 21, 1998 · The structure of well-dispersed Mo oxides on TiO 2 (110) was investigated by means of polarization-dependent total-reflection fluorescence X-ray absorption fine structure (PTRF-EXAFS) in three different directions of the single-crystal surface.

May 5, 2001 · X-ray absorption fine structure (XAFS) analysis of the supported samples indicated the presence of dispersed species retaining metallic bonding with a characteristic Mo−P distance of 0.243 nm but showing considerable attenuation in Mo−Mo linkages.

Jan 15, 1997 · The metal-support interaction in oxidic and sulfided (Co)Mo/Al 2 O 3 and (Co)Mo/TiO 2 catalysts has been studied with X-ray absorption spectroscopy. Analysis of the oxidic catalysts showed that on both Mo/Al 2 O 3 and Mo/TiO 2 the molybdenum oxide particles possess a highly distorted octahedral structure with Mo–O distances ranging from 1.71 ...

The XAFS spectra of the Mo K-edge were investigated regarding molybdenum ions in sodium potassium silicate glasses. In all the measured glasses the molybdenum ions are considered to be in the 6+ oxidation state. We evaluated the Mo-O correlation and concluded that Mo 6+ ion forms the MoO 4 2-tetrahedron. The Mo-O distance is approximately 0.177 nm.

ZSM-5 supported Mo catalysts for the dehydroaromatization reaction of methane were characterized by Mo K-edge EXAFS, NH3-TPD, and XPS techniques. Mo/ZSM-5 catalysts showed the maximum activity for ben-zene formation at 5 wt% Mo. The activity of the catalysts was related to the particle size of Mo2C supported on ZSM-5 estimated by Mo K-edge EXAFS.