Search

Your search keyword '"Román-Leshkov, Yuriy"' showing total 7 results
Start Over Author "Román-Leshkov, Yuriy" Publisher american association for the advancement of science
7 results on '"Román-Leshkov, Yuriy"'

1. Mixed plastics waste valorization through tandem chemical oxidation and biological funneling

Author

Department of Energy (US), Advanced Manufacturing Office (US), Bioenergy Technologies Office (US), National Renewable Energy Laboratory (US), Sullivan, Kevin P. [0000-0003-3324-1145], Werner, Allison Z. [0000-0001-7147-2863], Ellis, Lucas D. [0000-0001-6026-1825, Black, Brenna A. [0000-0003-0035-7942], Brandner, David G. [0000-0003-4296-4855], Bratti, Felicia [0000-0003-2381-953X], Buss, Bonnie L. [0000-0001-7977-0670], Dong, Xueming [0000-0001-8726-7565], Haugen, Stefan J. [0000-0003-3999-0796], Ingraham, Morgan A. [0000-0002-7350-4862], Michener, William E. [0000-0001-6023-7286], Miscall, Joel [0000-0002-4513-8703], Pardo, Isabel [0000-0002-8568-1559], Guss, Adam M. [0000-0001-5823-5329], Román-Leshkov, Yuriy [0000-0002-0025-4233], Beckham, Gregg T. [0000-0002-3480-212X], Sullivan, Kevin P., Werner, Allison Z., Ramirez, Kelsey J., Ellis, Lucas D., Bussard, Jeremy R., Black, Brenna A., Brandner, David G., Bratti, Felicia, Buss, Bonnie L., Dong, Xueming, Haugen, Stefan J., Ingraham, Morgan A., Konev, Mikhail O., Michener, William E., Miscall, Joel, Pardo, Isabel, Woodworth, Sean P., Guss, Adam M., Román-Leshkov, Yuriy, Stahl, Shannon S., Beckham, Gregg T., Department of Energy (US), Advanced Manufacturing Office (US), Bioenergy Technologies Office (US), National Renewable Energy Laboratory (US), Sullivan, Kevin P. [0000-0003-3324-1145], Werner, Allison Z. [0000-0001-7147-2863], Ellis, Lucas D. [0000-0001-6026-1825, Black, Brenna A. [0000-0003-0035-7942], Brandner, David G. [0000-0003-4296-4855], Bratti, Felicia [0000-0003-2381-953X], Buss, Bonnie L. [0000-0001-7977-0670], Dong, Xueming [0000-0001-8726-7565], Haugen, Stefan J. [0000-0003-3999-0796], Ingraham, Morgan A. [0000-0002-7350-4862], Michener, William E. [0000-0001-6023-7286], Miscall, Joel [0000-0002-4513-8703], Pardo, Isabel [0000-0002-8568-1559], Guss, Adam M. [0000-0001-5823-5329], Román-Leshkov, Yuriy [0000-0002-0025-4233], Beckham, Gregg T. [0000-0002-3480-212X], Sullivan, Kevin P., Werner, Allison Z., Ramirez, Kelsey J., Ellis, Lucas D., Bussard, Jeremy R., Black, Brenna A., Brandner, David G., Bratti, Felicia, Buss, Bonnie L., Dong, Xueming, Haugen, Stefan J., Ingraham, Morgan A., Konev, Mikhail O., Michener, William E., Miscall, Joel, Pardo, Isabel, Woodworth, Sean P., Guss, Adam M., Román-Leshkov, Yuriy, Stahl, Shannon S., and Beckham, Gregg T.

Abstract

Mixed plastics waste represents an abundant and largely untapped feedstock for the production of valuable products. The chemical diversity and complexity of thesematerials, however, present major barriers to realizing this opportunity. In this work, we show that metal-catalyzed autoxidation depolymerizes comingled polymers into a mixture of oxygenated small molecules that are advantaged substrates for biological conversion. We engineer a robust soil bacterium, Pseudomonas putida, to funnel these oxygenated compounds into a single exemplary chemical product, either b-ketoadipate or polyhydroxyalkanoates. This hybrid process establishes a strategy for the selective conversion of mixed plastics waste into useful chemical products.

Published
2022

4. Mixed plastics waste valorization through tandem chemical oxidation and biological funneling.

Author

Sullivan, Kevin P., Werner, Allison Z., Ramirez, Kelsey J., Ellis, Lucas D., Bussard, Jeremy R., Black, Brenna A., Brandner, David G., Bratti, Felicia, Buss, Bonnie L., Xueming Dong, Haugen, Stefan J., Ingraham, Morgan A., Konev, Mikhail O., Michener, William E., Miscall, Joel, Pardo, Isabel, Woodworth, Sean P., Guss, Adam M., Román-Leshkov, Yuriy, and Stahl, Shannon S.

Published
2022
Full Text
View/download PDF

6. Phase Modifiers Promote Efficient Production of Hydroxymethylfurfural from Fructose.

Author

Román-Leshkov, Yuriy, Chheda, Juben N., and Dumesic, James A.

Subjects
*FRUCTOSE derivatives, *FURANS, *BIOMASS, *GLYCOSIDES, *PETROLEUM, *MONOSACCHARIDES, *SUCROSE, *HETEROCYCLIC compounds, *FOSSIL fuels
Abstract

Furan derivatives obtained from renewable biomass resources have the potential to serve as substitutes for the petroleum-based building blocks that are currently used in the production of plastics and fine chemicals. We developed a process for the selective dehydration of fructose to 5-hydroxymethylfurfural (HMF) that operates at high fructose concentrations (10 to 50 weight %), achieves high yields (80% HMF selectivity at 90% fructose conversion), and delivers HMF in a separation-friendly solvent. In a two-phase reactor system, fructose is dehydrated in the aqueous phase with the use of an acid catalyst (hydrochloric acid or an acidic ion-exchange resin) with dimethylsulfoxide and/or poly(1-vinyl-2-pyrrolidinone) added to suppress undesired side reactions. The HMF product is continuously extracted into an organic phase (methylisobutylketone) modified with 2-butanol to enhance partitioning from the reactive aqueous solution. [ABSTRACT FROM AUTHOR]

Published
2006
Full Text
View/download PDF

7. Self-assembly of noble metal monolayers on transition metal carbide nanoparticle catalysts.

Author

Hunt, Sean T., Milina, Maria, Alba-Rubio, Ana C., Hendon, Christopher H., Dumesic, James A., and Román-Leshkov, Yuriy

Subjects
*MOLECULAR self-assembly, *TRANSITION metal compounds, *CARBIDES, *NANOPARTICLES, *MONOMOLECULAR films, *ELECTROLYTIC oxidation, *PRECIOUS metals, *METAL catalysts
Abstract

We demonstrated the self-assembly of transition metal carbide nanoparticles coated with atomically thin noble metal monolayers by carburizing mixtures of noble metal salts and transition metal oxides encapsulated in removable silica templates.This approach allows for control of the final core-shell architecture, including particle size, monolayer coverage, and heterometallic composition. Carbon-supported Ti0.1W0.9C nanoparticles coated with Pt or bimetallic PtRu monolayers exhibited enhanced resistance to sintering and CO poisoning, achieving an order of magnitude increase in specific activity over commercial catalysts for methanol electrooxidation after 10,000 cycles.These core-shellmaterials provide a newdirection to reduce the loading, enhance the activity, and increase the stability of noble metal catalysts. [ABSTRACT FROM AUTHOR]

Published
2016
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results