Regulation of Ir Dopant in Mo Oxides by Flame Spray Pyrolysis for Efficient CO Hydrogenation.

Mo carbide is recognized as one of the most promising catalysts for CO utilization via reverse water-gas shift (RWGS). However, the catalysts always suffered from low processing capacity, undesired products and deactivation. Herein, an Ir modified MoO synthesized by the flame spray pyrolysis (FSP) method exhibits higher reaction rate (63.

Bifunctional CoFe/HZSM-5 catalysts orient CO hydrogenation towards liquid hydrocarbons.

Converting CO to liquid (C) hydrocarbons remains a significant hurdle. Our study shows that CoFe/HZSM-5 boosts C selectivity to 73.4%, up from 59% for Fe/HZSM-5.

Engineered disorder in CO photocatalysis.

Light harvesting, separation of charge carriers, and surface reactions are three fundamental steps that are essential for an efficient photocatalyst. Here we show that these steps in the TiO can be boosted simultaneously by disorder engineering. A solid-state reduction reaction between sodium and TiO forms a core-shell c-TiO@a-TiO(OH) heterostructure, comprised of HO-Ti-[O]-Ti surface frustrated Lewis pairs (SFLPs) embedded in an amorphous shell surrounding a crystalline core, which enables a new genre of chemical reactivity.

Towards the development of the emerging process of CO heterogenous hydrogenation into high-value unsaturated heavy hydrocarbons.

The emerging process of CO hydrogenation through heterogenous catalysis into important bulk chemicals provides an alternative strategy for sustainable and low-cost production of valuable chemicals, and brings an important chance for mitigating CO emissions. Direct synthesis of the family of unsaturated heavy hydrocarbons such as α-olefins and aromatics CO hydrogenation is more attractive and challenging than the production of short-chain products to modern society, suffering from the difficult control between C-O activation and C-C coupling towards long-chain hydrocarbons. In the past several years, rapid progress has been achieved in the development of efficient catalysts for the process and understanding of their catalytic mechanisms.

Importance of the Initial Oxidation State of Copper for the Catalytic Hydrogenation of Dimethyl Oxalate to Ethylene Glycol.

Exposing a Cu-based catalyst to a suitable temperature is of great importance to optimize its hydrogenation performance, as copper is sensitive to temperature. Herein, we investigated the effect of the initial oxidation state of copper, tuned by the reduction temperature, on its catalytic performance in the hydrogenation of dimethyl oxalate (DMO) to ethylene glycol (EG) through designing a series of catalysts with different reduction temperatures (200-350 °C). Among these catalysts, the Cu/SiO catalyst prepared by ammonia evaporation with a hydrogen reduction process at 250 °C showed the best performance in the hydrogenation of DMO with a conversion of 100 % and a selectivity to EG higher than 95 %.

Tailored metastable Ce-Zr oxides with highly distorted lattice oxygen for accelerating redox cycles.

Ceria-based catalysts are widely used in oxidation or oxidation-reduction reactions in the field of environmental science. Their catalytic functions are determined by their ability to exchange oxygen species with oxidants. The enhancement of oxygen release is desired since it is often the rate-determining step in redox cycles.

Dual effects of water vapor on ceria-supported gold clusters.

Atomically precise nanocatalysts are currently being intensely pursued in catalysis research. Such nanocatalysts can serve as model catalysts for gaining fundamental insights into catalytic processes. In this work we report a discovery that water vapor provokes the mild removal of surface long-chain ligands on 25-atom Au25(SC12H25)18 nanoclusters in a controlled manner.

Erratum: Directly converting CO into a gasoline fuel.

This corrects the article DOI: 10.1038/ncomms15174.

Directly converting CO into a gasoline fuel.

The direct production of liquid fuels from CO hydrogenation has attracted enormous interest for its significant roles in mitigating CO emissions and reducing dependence on petrochemicals. Here we report a highly efficient, stable and multifunctional Na-FeO/HZSM-5 catalyst, which can directly convert CO to gasoline-range (C-C) hydrocarbons with selectivity up to 78% of all hydrocarbons while only 4% methane at a CO conversion of 22% under industrial relevant conditions. It is achieved by a multifunctional catalyst providing three types of active sites (FeO, FeC and acid sites), which cooperatively catalyse a tandem reaction.

Mild activation of CeO2-supported gold nanoclusters and insight into the catalytic behavior in CO oxidation.

We report a new activation method and insight into the catalytic behavior of a CeO2-supported, atomically precise Au144(SR)60 nanocluster catalyst (where thiolate -SR = -SCH2CH2Ph) for CO oxidation. An important finding is that the activation of the catalyst is closely related to the production of active oxygen species on CeO2, rather than ligand removal of the Au144(SR)60 clusters. A mild O2 pretreatment (at 80 °C) can activate the catalyst, and the addition of reductive gases (CO or H2) can enhance the activation effects of O2 pretreatment via a redox cycle in which CO could reduce the surface of CeO2 to produce oxygen vacancies-which then adsorb and activate O2 to produce more active oxygen species.

One-phase controlled synthesis of Au25 nanospheres and nanorods from 1.3 nm Au : PPh3 nanoparticles: the ligand effects.

We report the controlled synthesis of [Au25(PPh3)10(SR1)5X2](2+) nanorods (H-SR1: alkyl thiol, H-SC2H4Ph and H-S(n-C6H13)) and Au25(SR2)18 nanospheres (H-SR2: aromatic thiol, H-SPh and H-SNap) under the one-phase thiol etching reaction of the polydisperse Aun(PPh3)m parent-particles (core diameter: 1.3 ± 0.4 nm, 20 < n < 50).

CeO2-supported Au38(SR)24 nanocluster catalysts for CO oxidation: a comparison of ligand-on and -off catalysts.

The catalytic properties of atomically precise, thiolate-protected Au38(SR)24 (R = CH2CH2Ph) nanoclusters supported on CeO2 were investigated for CO oxidation in a fixed bed quartz reactor. Oxygen (O2) thermal pretreatment of Au38(SR)24/CeO2 at a temperature between 100 and 175 °C largely enhanced the catalytic activity, while pretreatment at higher temperatures (>200 °C) for removing thiolate instead gave rise to a somewhat lower activity than that for 175 °C pretreatment, and the ligand-off clusters were also found to be less stable. The CO conversion in the case of wet feed-gas (i.

CO oxidation catalyzed by oxide-supported Au25(SR)18 nanoclusters and identification of perimeter sites as active centers.

In this work, we explore the catalytic application of atomically monodisperse, thiolate-protected Au(25)(SR)(18) (where R = CH(2)CH(2)Ph) nanoclusters supported on oxides for CO oxidation. The solution phase nanoclusters were directly deposited onto various oxide supports (including TiO(2), CeO(2), and Fe(2)O(3)), and the as-prepared catalysts were evaluated for the CO oxidation reaction in a fixed bed reactor. The supports exhibited a strong effect, and the Au(25)(SR)(18)/CeO(2) catalyst was found to be much more active than the others.

Influences of precipitate rinsing solvents on Ni catalyst for methane decomposition to CO(x)-free hydrogen.

Influences of precipitate rinsing solvents on Ni for methane decomposition to CO(x)-free hydrogen has been investigated in this study. Calcination of nickel hydroxide precipitates rinsed by ethanol leads to the formation of nanosheet needle-like NiO, whereas calcination of those rinsed by deionized water leads to the formation of pure nanosheet NiO. When compared to Ni catalyst (Ni-et) reduced from nanosheet needle-like NiO, Ni catalyst (Ni-etwt), reduced from pure nanosheet-like NiO, exhibits a better catalytic performance for methane decomposition.