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Results for “active sites”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Unveiling Active Sites of CO[subscript 2] Reduction on Nitrogen-Coordinated and Atomically Dispersed Iron and Cobalt Catalysts
Abstract not provided
Orthogonal Active-Site Labels for Mixed-Linkage endo-[beta]-Glucanases
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Effect of Nickel Active Site Density on the Deactivation of Ni-Beta Zeolite Catalysts during Ethene
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Optimizing Active Sites for High CO Selectivity during CO 2 Hydrogenation over Supported Nickel Catalysts
The undesired formation of CH 4 during the hydrogenation of CO 2 remains a great challenge with direct impact on selectivity towards CO or CH 3 OH. In this study, the selectivity of a supported Ni catalyst prepared by traditional impregnation method was found to change after a first CO 2 hydrogenation reaction cycle from 100 to 800 °C. The usually high CH 4 formation was suppressed leading to full selectivity towards CO. This behavior was also observed after the catalyst was treated under methane or propane atmospheres at elevated temperatures. In-situ spectroscopic studies revealed that the accumulation of carbon species on the catalyst surface at high temperature leads to a nickel carbide-like phase. The catalyst regains its high selectivity to CH 4 production after carbon depletion from the surface of the Ni particles by oxidation. However, the selectivity readily shifts back towards CO formation after a new temperature programmed CO 2 hydrogenation cycle. The fraction of weakly adsorbed CO species increases on the carbide-like surface when compared to a clean nickel surface, explaining the higher selectivity towards CO formation. This easy protocol of changing the surface of a common Ni catalyst to gain selectivity represents an important step for the commercial use of CO 2 hydrogenation to CO process together with Fischer-Tropsch applications.
Mimicking the Electron Transport Chain and Active Site of [FeFe] Hydrogenases in One Metal–Organic Framework: Factors That Influence Charge Transport
Not Available
Efficient upgrading of CO to C3 fuel using asymmetric C-C coupling active sites
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Dynamic evolution and reversibility of single-atom Ni(II) active site in 1T-MoS2 electrocatalysts for hydrogen evolution
Not Available
CK2-mediated phosphorylation of SUZ12 promotes PRC2 function by stabilizing enzyme active site
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Stepwise assembly of the active site of [NiFe]-hydrogenase
Not provided.
Biomimetic active sites on monolayered metal?organic frameworks for artificial photosynthesis
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