SEARCH · Engineering Papers
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.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Goethite with protuberant lychee morphology has been synthesized that accomplishes C-H activation of N-methylanilines to generate α-aminonitriles; the catalyst takes oxygen from air and uses it as a cooxidant in the process.
Implementing a chemical C–N coupling step to intercept reactive intermediates in electrocatalytic CO 2 or NO x y– reduction reactions is an emerging approach to sustainable electrosynthesis of organonitrogen compounds from cheap and abundant feedstocks.
Calorimetry is used to measure the reaction enthalpies of hydrogen activation by 2,6-lutidine (Lut), 2,2,6,6-tetramethylpiperidine (TMP), N-methyl-2,2,6,6-tetramethylpiperidine (MeTMP) and tri-tert-butylphosphine (TBP) with tris(pentafluorophenyl)borane (BCF). At 6.6 bar H2 the conversion of the Lewis acid Lewis base pair to the corresponding ionic pair in bromobenzene at 294 K was quantitative in under 60 minutes. Integration of the heat release from the reaction of the Frustrated Lewis Pair (FLP) with hydrogen as a function of time yields a relative rate of hydrogenation in addition to the enthalpy of hydrogenation. The half-lives of hydrogenation range from 230 seconds with TMP, ΔHH2 = -31.5(0.2) kcal/mol, to 1400 seconds with Lut, ΔHH2 = -23.4(0.4) kcal/mol. The 11B NMR spectrum of B(C6F5)3 in bromobenzene exhibits three distinct traits depending on the sterics of the Lewis base; (i) in the presence of pyridine, only the dative bond adduct pyridine--B(C6F5)3 is observed, (ii) in the presence of TMP and MeTMP only the free B(C6F5)3 is observed, and (iii) in the presence of Lut both the free B(C6F5)3 and the Lut--B(C6F5)3 adduct appear in equilibrium. A measure of the change in Keq of Lut + B(C6F5)3 <->Lut--B(C6F5)3 as a function of temperature provides thermodynamic properties of the Lewis acid Lewis base adduct, ΔH = -17.9(1.0) kcal/mol and a ΔS = -49.2(2.5) cal/mol K, suggesting the Lut--B(C6F5)3 adduct is more stable in bromobenzene than in toluene. This research was supported by the U.S. Department of Energy’s Basic Energy Sciences, Division of Chemical Sciences, Biosciences and Geosciences. D.M.C. and A.K. acknowledges support by the Laboratory Directed Research and Development program at the Pacific Northwest National Laboratory (PNNL) to perform kinetic analyses of the calorimetry data. The work was performed in part at EMSL, a national scientific user facility sponsored by the DOE Office of Biological and Environmental Research. EMSL is located at Pacific Northwest National Laboratory (PNNL), which is operated by Battelle for DOE.
Explore the source record for details and available documents.
Inaccuracy in chemical kinetic models is a problem that affects the reliability of large-scale process models.
Nickel-supported nitrenoids exhibit iminyl character, as determined by multi-edge XAS and TDDFT analysis, demonstrate efficacy for C–H activation and nitrene transfer chemistry.
The wide spread use of hazardous and expensive solvents for the liquid-liquid extraction (LLE) of critical metals has been a growing source of waste in the metal refinement industry. We have developed and characterized room temperature liquid hydrophobic binary mixtures based on common pharmaceutical and food grade compounds as sustainable, cost effective alternatives to both ionic liquids and conventional solvents. Additionally, we introduce liquid mixtures with Proton Sponge® (1,8-bis(dimethylamino)naphthalene), one of the strongest known organic bases. These mixtures have been applied to the LLE of indium(III) ions from hydrochloric acid solutions, displaying an extraction efficiency greater than 99% in some systems. Here, a systematic approach to identifying the underlying mechanism of extraction, in particular relating to the charge, solubility, and complexation of the indium species in the organic phase has been developed.
Multi-responsive colorimetric sensors based on the hydrazone motif, which are perfectly suited for chemo sensing applications have been developed.
Pure-gas sorption and mixed-gas transport properties of six functionalized PIM-1 variants were systematically investigated to study the role of CO 2 affinity and polymer chemistry on competitive sorption.
Abstract not provided
Not Available
Presented by NETL at ASME 2015 International Mechanical Engineering Congress & Exposition, 11/15
Supercapacitor, also calls the ultracapacitor, is a newly developed green, alternative energy resource used in many renewable energy systems. It compliments a primary energy source like an internal combustion engine, fuel cell or batter, which cannot repeatedly provide quick busts of power. Primary energy sources work well as a continuous source of low power. However, they cannot efficiently handle peak power demands or recapture energy whereas supercapacitors can deliver quick bursts of energy during peak power demands then quickly store energy and capture excess power. This makes supercapacitor a device well suited for power generation associated with many renewable sources. Many renewable energy sources yield only intermittent electricity generation. We therefore require advanced devices like supercapacitors that quickly capture and release stored energy.
The US-China Clean Energy Research Center (CERC) was established in November 2009 by Presidents Obama and Hu. CERC is made up of three consortia focused on building efficiency, clean vehicles and advanced coal technologies. The Advanced Coal Technology Consortium (ACTC) brings together many of the top scientists and leading companies in the power sector, who work together collaboratively to accelerate deployment of the most promising technologies and tackle some of the most pressing issues in making coal plants more efficient and environmentally friendly. Reducing carbon emissions in the power sector is a central goal for both US and Chinese decision makers and industrial leaders, since, worldwide, coal power plants produce nearly 40% of greenhouse gases. In order to deeply reduce their greenhouse gas emissions, many utilities are considering carbon capture, utilization, and sequestration (CCUS). CCUS can enable the current fossil fuel infrastructure to be utilized while non-fossil fuel based energy supplies evolve to replace fossil fuels. For the existing US and Chinese coal-burning fleets, post-combustion capture (PCC) remains a critically important option and viable approach. While companies provide technology for PCC retrofits, the costs and performance of these systems remain largely untested in commercial settings. As such, power generation companies have very few technical or economic data sets on which to base large capital decisions. Moreover, initial estimates suggest the costs will prove prohibitively high in many settings.
No abstract provided.
Carbon emissions in the power sector remains an important goal for both US and Chinese decision makers and industrial leaders. To deeply reduce their greenhouse gas emissions, many utilities are considering carbon capture, utilization, and sequestration (CCUS). CCUS can enable the current fossil fuel infrastructure to be utilized while non-fossil fuel based energy supplies evolve to replace fossil fuels.
Carbon emissions in the power sector remains an important goal for both US and Chinese decision makers and industrial leaders. To deeply reduce their greenhouse gas emissions, many utilities are evaluating low and zero carbon generation technologies such as carbon capture, utilization, and sequestration (CCUS).