Study on Hydrogenation Performance of Oil-Soluble Molybdenum Catalyst in Coal-Oil Co-Processing

An oil-soluble molybdenum catalyst was synthesized by a simple and novel method and studied for hydrogenation in coal-oil co-processing. The catalyst was characterized by infrared spectrum (IR), thermogravimetry (TG), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The morphology and crystal structure of catalyst was characterized with scanning electron microscope (SEM) and high resolution transmission electron microscopy (HRTEM). The catalyst can be considered as a precursor that can be converted into active MoS2 components through thermal decomposition and sulfidation. The hydrogenation experiment was carried out by the model reactants of tetradecane and 2-methylnaphthalene with a change of reaction (405℃-445℃) temperature and concentrations of molybdenum catalyst (Mo conc. 0.6-10 mg/g), and results showed that the delightly hydrogenation function of catalyst is to improve the saturation of aromatic ring. The most abundant stacking numbers of decomposed catalyst were 2 and 3, accounting for 53% of all catalyst microcrystalline units. The rapid hydrogenation stage and the significant decrease of feed heavy fraction in co-processing experiment provided the evidence that the hydrogenation performance of the synthesized catalyst is remarkable in coal-oil co-processing.

A Bioinspired Molybdenum Catalyst for Aqueous Perchlorate Reduction

<p>The detection of perchlorate (ClO₄⁻) on and beyond Earth requires ClO₄⁻ reduction technologies to support water purification and space exploration. However, the reduction of ClO₄⁻ usually entails either harsh conditions or multi-component enzymatic processes. We developed a heterogeneous Mo−Pd/C catalyst from sodium molybdate to reduce aqueous ClO₄⁻ into Cl⁻ with 1 atm H₂ at room temperature. Upon hydrogenation by H₂/Pd, the reduced Mo oxide species and a bidentate nitrogen ligand (1:1 molar ratio) are transformed <i>in situ</i> into oligomeric Mo sites on the carbon support. The turnover number and frequency for oxygen atom transfer from ClO_x⁻ substrates reached 3850 and 165 h⁻¹ on each Mo site. This simple bioinspired design yielded a robust water-compatible catalyst for the removal and utilization of ClO₄⁻.</p>

A Bioinspired Molybdenum Catalyst for Aqueous Perchlorate Reduction

<p>The detection of perchlorate (ClO₄⁻) on and beyond Earth requires ClO₄⁻ reduction technologies to support water purification and space exploration. However, the reduction of ClO₄⁻ usually entails either harsh conditions or multi-component enzymatic processes. We developed a heterogeneous Mo−Pd/C catalyst from sodium molybdate to reduce aqueous ClO₄⁻ into Cl⁻ with 1 atm H₂ at room temperature. Upon hydrogenation by H₂/Pd, the reduced Mo oxide species and a bidentate nitrogen ligand (1:1 molar ratio) are transformed <i>in situ</i> into oligomeric Mo sites on the carbon support. The turnover number and frequency for oxygen atom transfer from ClO_x⁻ substrates reached 3850 and 165 h⁻¹ on each Mo site. This simple bioinspired design yielded a robust water-compatible catalyst for the removal and utilization of ClO₄⁻.</p>