Heterogeneous Cu-Fe oxide catalysts for preferential CO oxidation (PROX) in H-rich process streams.

The influence of Fe loading in Cu-Fe phases and its effect on carbon monoxide (CO) oxidation in H-rich reactant streams were investigated with the catalyst material phases characterized by Field Emission Scanning Electron Microscopy (FESEM), X-ray diffraction (XRD) studies and Mössbauer Spectroscopy (MS). There was no change in the oxidation state of the Fe ions with copper or iron loading. The catalytic activity was examined in the feed consisting of H, HO and CO for the preferential CO oxidation (PROX) process.

The effect of oxidant species on direct, non-syngas conversion of methane to methanol over an FePO catalyst material.

The effect of the phase transformation of a FePO catalyst material from the tridymite-like (tdm) FePO to the α-domain (α-Fe(PO)) during the direct selective oxidation of methane to methanol was studied using oxidant species O, HO and NO. The main reaction products were CHOH, carbon dioxide and carbon monoxide, whereas formaldehyde was produced in rather minute amounts. Results showed that the single-step non-syngas activation of CH to oxygenate(s) on a solid FePO phase-specific catalyst was influenced by the nature of the oxidizer used for the CH turnover.

Unraveling the Arrangement of Al and Fe within the Framework Explains the Magnetism of Mixed-Metal MIL-100(Al,Fe).

Properties of mixed-metal MOFs depend on the distribution of different metals within their frameworks. Determination of this distribution is often very challenging. Using an example of aluminum- and iron-containing MIL-100, we demonstrate that Al NMR spectroscopy, when combined with first-principles calculations and magnetic, X-band electron paramagnetic resonance, Fe K-edge extended X-ray absorption fine structure, and Mössbauer measurements, enables one to accurately determine the arrangement of Al and Fe within the metal trimers, which are the basic building units of MIL-100.