A5059994808- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Molten salt chemistry and electrochemical processes
- Metallurgical Processes and Thermodynamics
- Phase Change Materials Research
- Fluorine in Organic Chemistry
- Engineering Diagnostics and Reliability
- Advanced Power Generation Technologies
- Adsorption and Cooling Systems
- Thermal Expansion and Ionic Conductivity
- Bauxite Residue and Utilization
- Corrosion Behavior and Inhibition
- Material Properties and Failure Mechanisms
- Career Development and Diversity
- Concrete and Cement Materials Research
- Advanced Thermoelectric Materials and Devices
- Magnesium Oxide Properties and Applications
- Nuclear materials and radiation effects
- Catalytic Processes in Materials Science
- Catalytic Cross-Coupling Reactions
- Social Acceptance of Renewable Energy
- Solar Thermal and Photovoltaic Systems
- Organic Chemistry Cycloaddition Reactions
- Inorganic Fluorides and Related Compounds
- Mineral Processing and Grinding
National Renewable Energy Laboratory
2021-2024
Colorado School of Mines
2022-2023
Advanced Energy Systems (United States)
2022
Colorado State University
2015-2018
Yale University
2013
We present a study on the electrochemical behavior of magnesium hydroxide (MgOH + ) reduction tungsten (W) cathode in molten chloride salt (MgCl 2 -KCl-NaCl) across temperature range 475 °C–525 °C. MgOH , which forms within upon exposure to moisture, is leading cause corrosion. Corrosion major barrier deployment salts number applications, including concentrating solar power plants and nuclear plants. While pre-purification protocols have been developed ensure removed from prior deployment,...
The presence of Cu in reactions triphenylene (TRPH) and 1,4-C4 F8 I2 at 360 °C led to regiospecific substitution TRPH ortho C(β) atoms form C4 -containing rings, completely suppressing on C(α) atoms. In addition, caused selective reductive-defluorination/aromatization (RD/A) F4 aromatic rings. Without Cu, the were not no RD/A was observed. These results, supported by DFT calculations, are first examples Cu-promoted 1) perfluoroannulation, 2) preparative C-F activation, 3) RD/A. HPLC-purified...
In a simple, one-step direct trifluoromethylation of phenazine with CF3 I we prepared and characterized nine (poly)trifluoromethyl derivatives up to six groups. The electrochemical reduction potentials gas-phase electron affinities show direct, strict linear relation the number groups, phenazine(CF3)6 reaching record-high affinity 3.24 eV among perfluoroalkylated polyaromatics.
Abstract Molten chloride salts are stable at higher temperatures than many other salts, including nitrate and thus promising for heat transfer and/or thermal energy storage in concentrating solar power, nuclear applications. However, corrosion molten remains a significant problem. While studies have been devoted to evaluation of corrosion, we find that comprehensive method predicting is lacking. Here, present an using Ellingham diagrams chloride-oxide stability diagrams, which enable...
A series of cyclometalated benzoquinoline complexes Ir(III) catalyze the hydrogenation heterocyclic ring quinolines under mild conditions. Our best catalyst is active in a significantly wider range solvents than our previous systems. In presence suitable base, species also able to hydrogenate C═O bonds aldehydes. When and aldehydes are present together, complex catalyzes tandem reaction which quinoline first hydrogenated tetrahydroquinoline that subsequently reductively alkylated by...
For commercial buildings, liquid desiccant air conditioners (LDACs) could provide up to 80% energy savings compared high-efficiency vapor compression AC, but commonly utilized desiccants are highly corrosive. This precludes the use of metallic components, necessitating specialized plastics and thereby driving cost, weight, limiting operational temperature pressure ranges. Less corrosive alternatives sought. Here, potassium acetate solutions investigated as less-corrosive chloride salt that...
Abstract Currently, the iron and steel industry is responsible for 7% of global CO 2 emissions. In this review, we summarize operational principles current emissions-intensive steelmaking technologies review emerging low- zero-carbon that could substantially reduce Current are discussed include blast furnaces, electric arc smelting. Promising low-carbon routes use alternative reductants ore processing (hydrogen direct reduction, hydrogen plasma-smelting, smelting, ammonia-based reduction),...
Use of D3h -symmetrical triphenylene (TRPH) as a substrate for high-temperature radical reactions with C4 F8 I2 under varying conditions resulted in the introduction four types fluorinated substituents: ω-C4 H, c-C4 , F4 and HF3 . In contrast to previous work on direct (poly)substitutions RF groups polycyclic aromatic hydrocarbons (PAHs), this regiospecificity, selectivity, high yield were achieved TRPH(C4 ) )3 New single-crystal structural data seven compounds combined literature...
Molten salts are an excellent choice for thermal energy storage materials in concentrated solar power (CSP) plants, yet some can cause corrosion of containment alloys that damage plants and increase maintenance costs. Corrosion rates have been characterized many salt/alloy combinations. However, at junctions dissimilar molten relatively poorly characterized. At such junctions, which common CSP it is possible galvanic interactions or other mechanisms could above the industry standard 20...
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The utility of molten chloride salts in concentrating solar power (CSP) is dependent on the ability to maintain low corrosive impurities. Without proper purification, corrosion rates containment alloys exceed industry standard corrosion—under 20 μm/year. An extensive body literature focuses initial purification stage salts. However, occurrences such as maintenance, leaks, and so forth expose salt atmosphere reintroduce Therefore, it critical develop a strategy that can control impurity...
Abstract Invited for this month's cover are the groups of Steven Strauss/Olga Boltalina at Colorado State University, and Yu‐Sheng Chen NSF's ChemMatCARS. The picture shows evolution fluorous triphenylene crystal packing motifs against backdrop Very Large Array near Magdalena in New Mexico, where scientists study universe. stepwise structural columnar observed was possible because development a one‐step selective synthesis triphenylene(C 4 F 8 ) n derivatives ( = 1–3). These compounds...