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Showing 1 to 20 of 55 for “"CO adsorption"”.
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Co-adsorption of phenol and calcium from an industrial wastewater stream
… large producers of industrial wastewater that contain both organic and inorganic pollutants that influence water quality and availability. Conventional wastewater treatment methods such as chemical precipitation and membrane filtration are not economical and environmentally friendly. In …
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Phase diagram for the co-adsorption of O and OH on Pt(100) and Pt(111) as determined by DFT
The Langmuir adsorption isotherm is often used to model molecular adsorption on catalyst surfaces. The model assumes that adsorption occurs on a homogenous energy surface at specific localized sites with no lateral interactions between adsorbents. This simplification causes some concerns when …
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Adsorption of K and KO on Hägg iron carbide surfaces and its effect on the adsorption of CO: a DFT study
… iron is a well-established process, used for the conversion of syngas (a mixture of CO and H₂ ) to long chain hydrocarbons. Potassium is typically added as a promoter in iron-based Fischer-Tropsch to improve activity, selectivity and product distribution. The mechanism behind potassium promotion …
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Laserspektroskopische Untersuchungen zur Adsorption und Reaktion von CO auf katalytisch aktiven Oberflächen
… um ausgehend von einer Kalibrierung der CO SFG-Spektren gegen die absolute Oberflächenbedeckung mittels kombinierter TPD-, LEED- und SFG-Messungen sowie kinetischer Modellrechnungen die CO-Adsorption auf Pt(111)-, Rh(111)- und polykristallinen Pt- und Rh-Oberfläche über einen Druckbereich …
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Adsorption of water and carbon monoxide on Cu₂O(111) single crystal surfaces
Water and CO adsorptions were studied over the stoichiometric and the oxygen-deficient Cu₂O(111) surfaces, using thermal desorption spectroscopy (TDS), ultraviolet photoelectron spectroscopy (UPS), and X-ray photoelectron spectroscopy (XPS). Water is the only desorbing species detected in TDS and …
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Adsorption of Iodine and Water on Silver-Exchanged Mordenite
<p>The reprocessing of used nuclear fuel to recover the fissile materials generates off gases including radioactive nuclides namely 3H (tritiated water, H3HO), 129I, 85Kr, 135Xe, and 14C. Due to its high quantity in off-gas streams and long half-life (1.59 million years), 129I removal from the …
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Investigation and Characterization of the Optical, Thermal, and Adsorption Properties of Carbon Aerogels for CO2 Capture Applications
Climate change driven by rising atmospheric CO₂ concentrations has intensified the need for efficient, regenerable solid sorbents. Carbon aerogels are promising candidates due to their ultra-high porosity, low density, and tunable structure, yet their coupled optical, photothermal, and CO₂ …
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Manganese promotion of a Co/SiO2 Fischer-Tropsch catalyst
This study tests the hypothesis that the incorporation of manganese into cobaltbased/silica (SiO2) catalyst influences the activity and selectivity of the FischerTropsch synthesis via the enhancement of CO adsorption and dissociation. The base catalyst is prepared by impregnation (IMPR) of the SiO2 …
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Gold-nickel surface alloy chemistry with oxygen and carbon monoxide
… To characterize these adsorbates, saturation coverages of each diatomic on Au-Ni(111) held at 80 K are separately measured via high-resolution electron energy loss spectroscopy, as a function of increasing gold coverage. The progression from adsorptive to non-adsorptive behavior is …
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Sulphur dioxide oxidation mechanism on Pt surfaces : a DFT study
… renewable energy in order to lower fossil fuel consumption and its environmental impact. Hydrogen (H2) has been proposed as a viable alternative to fossil fuels due to its high energy per unit mass, as well as its low environmental impact. Despite numerous methods that exist for obtaining H2, …
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Nanopartículas de ouro suportadas em óxidos mistos de cério e ferro para a redução de NO por CO
… of Fe inserption into the CeO2 structure. Iron incorporation changed the CeO2 reducibility, reduced the crystallite size and increased the concentration of oxygen vacancies. Consequently, doping had effect on the performance of the catalysts in the redox reaction between NO and CO. As the …
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The theory and practice of perturbation chromatography applied to the investigation of H2 and CO chemisorption on a Co-Mo-A1 catalyst
… a flow system with on-line mixing of the pure components, carrier gases of various constant compositions of CO and He, H2, and He, and CO, H2, and He were passed over a Co-Mo-Al catalyst. The steady state system was perturbed by a small sample of either C140 or tritium. The retention time of …
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A density functional theory study into the mechanism and reactivity in heterogeneous system
… liquid and solid (chapter 5 and chapter 6). According to the reaction properties, we tackle these two kinds of reactions with different methods. The gas-solid reactions are solved by traditional Density Functional Theory (DFT) method; while liquid-solid reactions are carried out using ab initio …
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Development of porous metal-organic frameworks for gas adsorption applications
… of metal or metal-oxide vertices interconnected by rigid linker molecules. The highly ordered nature of MOF materials and the ability to tailor the framework's chemical functionality by modifying the organic ligands give the materials great potential for high efficiency adsorbents. In …
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Synthesis and Catalytic Applications of Ni-Based Single-Atom and Nanoparticle Catalysts Supported on UiO-66-NH2
… of industrial productivity, air pollution has become a shared concern globally. One of the most discussed topics in this field is the recycling and utilization of industrial exhaust gases, particularly the high-value utilization of carbon dioxide emissions. In this project, we focus on the …
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Phosphate and thermal stabilization of heavy metals in dredged sediments
… and reuse of dredged harbor sediments in construction as an alternative to disposal reduces costs and conserves resources. This research focused on leachability of metal contaminants subsequent to phosphate addition and thermal treatment at 700 C. X- ray absorption spectroscopy (XAS) in …
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Study of Interactions Between Diffusion Barrier Layers and Low-k Dielectric Materials for Copper/Low-k Integration
The shift to the Cu/low-k interconnect scheme requires the development of diffusion barrier/adhesion promoter materials that provide excellent performance in preventing the diffusion and intermixing of Cu into the adjacent dielectrics. The integration of Cu with low-k materials may decrease RC …
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Investigating CO2 Adsorption Behavior in Metal-Organic Frameworks by Solid-state NMR
With increasing demands in controlling carbon dioxide emissions, metal-organic frameworks (MOFs) are considered as promising candidates for CO2 capture due to their large CO2 adsorption capacity. In this study, the adsorption behavior of CO2 molecules in [Zn2(TRZ)2(NH2-BDC)] (TRZ=1,2,4-triazolate, …
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Nanocomposites for nitrogen oxide emissions control in lean-burn engines
(cont.) reducing agent than propane in the SCR of NO. Pt-Rh/CuO/A1₂O₃ nanocomposites capable of adsorbing SO₂ in oxygen-rich environment as metal sulfates and releasing SO₂ in reducing atmosphere were synthesized with sequential precipitation technique. These CuO-based sorbents possessed excellent …
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