Výsledky vyhledávání - "James M. Krier"

Cyclohexene and 1,4-Cyclohexadiene Hydrogenation Occur through Mutually Exclusive Intermediate Pathways on Platinum Nanoparticles

Autor: Gabor A. Somorjai, Kyriakos Komvopoulos, James M. Krier

Publikováno v: The Journal of Physical Chemistry C. 120:8246-8250

Platinum nanoparticles (NPs) capped with polyvinylpyrrolidone (PVP) were studied with sum frequency generation (SFG) vibrational spectroscopy under reaction conditions during cyclohexene (CH) and 1,4-cyclohexadiene (1,4-CHD) hydrogenation at 295 K. D

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b0c06a7f6d44240e6abd4f2136ea7cb1
https://doi.org/10.1021/acs.jpcc.6b01615

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Sum Frequency Generation Vibrational Spectroscopy of 1,3-Butadiene Hydrogenation on 4 nm Pt@SiO2, Pd@SiO2, and Rh@SiO2 Core–Shell Catalysts

Autor: Kyriakos Komvopoulos, Xiaojun Cai, Lindsay M. Carl, William D. Michalak, Gabor A. Somorjai, James M. Krier

Publikováno v: Nano Letters. 15:39-44

1,3-Butadiene (1,3-BD) hydrogenation was performed on 4 nm Pt, Pd, and Rh nanoparticles (NPs) encapsulated in SiO2 shells at 20, 60, and 100 °C. The core-shells were grown around polyvinylpyrrolidone (PVP) coated NPs (Stöber encapsulation) prepared

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::80e8dca4e667b97d385c3ce54dd9bcc1
https://doi.org/10.1021/nl502566b

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Comparing the Catalytic Oxidation of Ethanol at the Solid–Gas and Solid–Liquid Interfaces over Size-Controlled Pt Nanoparticles: Striking Differences in Kinetics and Mechanism

Autor: Christopher Thompson, James M. Krier, András Sápi, Gabor A. Somorjai, Xiaojun Cai, Fudong Liu, Hailiang Wang, Kwangjin An

Publikováno v: Nano Letters. 14:6727-6730

Pt nanoparticles with controlled size (2, 4, and 6 nm) are synthesized and tested in ethanol oxidation by molecular oxygen at 60 °C to acetaldehyde and carbon dioxide both in the gas and liquid phases. The turnover frequency of the reaction is ∼80

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e85e2f9c578aa7d2f243a42b4186af2f
https://doi.org/10.1021/nl5035545

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CO oxidation on PtSn nanoparticle catalysts occurs at the interface of Pt and Sn oxide domains formed under reaction conditions

Autor: Kyriakos Komvopoulos, James M. Krier, Jae-Yoon Shin, Zhi Liu, William D. Michalak, Gabor A. Somorjai, Selim Alayoglu, Kwangjin An

Publikováno v: Journal of Catalysis. 312:17-25

The barrier to CO oxidation on Pt catalysts is the strongly bound adsorbed CO, which inhibits O2 adsorption and hinders CO2 formation. Using reaction studies and in situ X-ray spectroscopy with colloidally prepared, monodisperse 2 nm Pt and PtSn nano

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::deb5cb88261942be167e03b09530cf50
https://doi.org/10.1016/j.jcat.2014.01.005

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Promotion of Hydrogenation of Organic Molecules by Incorporating Iron into Platinum Nanoparticle Catalysts: Displacement of Inactive Reaction Intermediates

Autor: Zhongwei Zhu, Griffin Kennedy, Selim Alayoglu, Yihai Wang, James M. Krier, Hailiang Wang, Gabor A. Somorjai, Gérôme Melaet, Kwangjin An

Publikováno v: ACS Catalysis. 3:2371-2375

We characterize the surface chemical states of reactants and catalysts under reaction conditions to elucidate the composition effect of platinum–iron bimetallic nanoparticles on catalytic hydrogenation of organic molecules. The catalytic hydrogenat

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::14166f77602c04afab296c28b9ea5cc6
https://doi.org/10.1021/cs400579j

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The Role of an Organic Cap in Nanoparticle Catalysis: Reversible Restructuring of Carbonaceous Material Controls Catalytic Activity of Platinum Nanoparticles for Ethylene Hydrogenation and Methanol Oxidation

Autor: James M. Krier, L. Robert Baker, Griffin Kennedy, Matthijs A. van Spronsen, Robert M. Onorato, Gabor A. Somorjai

Publikováno v: Catalysis Letters. 142:1286-1294

Inherent in the colloidal synthesis of nanoparticle catalysts is the presence of an organic capping agent that encapsulates the nanoparticles to prevent aggregation. However, this capping agent often remains present on the nanoparticles during cataly

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::23917d988f2d6cafad1849503e09b7c6
https://doi.org/10.1007/s10562-012-0904-3

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In Situ Surface and Reaction Probe Studies with Model Nanoparticle Catalysts

Autor: William D. Michalak, Elad Gross, Selim Alayoglu, Zhongwei Zhu, Gabor A. Somorjai, James M. Krier

Publikováno v: ACS Catalysis. 2:2250-2258

This review paper discusses the in situ surface characterization and catalytic measurements of colloidally synthesized model metal nanoparticle (NP) catalysts studied in the Somorjai lab. Sum Frequency Generation (SFG) vibrational spectroscopy techni

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https://doi.org/10.1021/cs3004903

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Sum Frequency Generation Vibrational Spectroscopy of Colloidal Platinum Nanoparticle Catalysts: Disordering versus Removal of Organic Capping

Autor: Kyriakos Komvopoulos, Kwangjin An, L. Robert Baker, Gabor A. Somorjai, William D. Michalak, James M. Krier

Publikováno v: The Journal of Physical Chemistry C. 116:17540-17546

Recent work with nanoparticle catalysts shows that size and shape control on the nanometer scale influences reaction rate and selectivity. Sum frequency generation (SFG) vibrational spectroscopy is...

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1872899b1dbbbc819e88a0d59114b23a
https://doi.org/10.1021/jp303363m

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Dramatically different kinetics and mechanism at solid/liquid and solid/gas interfaces for catalytic isopropanol oxidation over size-controlled platinum nanoparticles

Autor: Lindsay M. Carl, Danylo Zherebetskyy, Xiaojun Cai, Christopher Thompson, Lin-Wang Wang, Fudong Liu, James M. Krier, András Sápi, Gabor A. Somorjai, Hailiang Wang

Publikováno v: Journal of the American Chemical Society. 136(29)

We synthesize platinum nanoparticles with controlled average sizes of 2, 4, 6, and 8 nm and use them as model catalysts to study isopropanol oxidation to acetone in both the liquid and gas phases at 60 °C. The reaction at the solid/liquid interface

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ae28f635c1ef30f2c0037c1f9b1f9fef
https://pubmed.ncbi.nlm.nih.gov/24992695

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