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Han S, Ciufo RA, Wygant BR, Keitz BK, Mullins CB. Methanol Oxidation Catalyzed by Copper Nanoclusters Incorporated in Vacuum-Deposited HKUST-1 Thin Films. ACS Catal 2020. [DOI: 10.1021/acscatal.0c00592] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Sungmin Han
- Department of Chemistry, University of Texas at Austin, Austin, Texas 78712-0231, United States
| | - Ryan A. Ciufo
- Department of Chemistry, University of Texas at Austin, Austin, Texas 78712-0231, United States
| | - Bryan R. Wygant
- Department of Chemistry, University of Texas at Austin, Austin, Texas 78712-0231, United States
| | - Benjamin K. Keitz
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712-0231, United States
| | - C. Buddie Mullins
- Department of Chemistry, University of Texas at Austin, Austin, Texas 78712-0231, United States
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712-0231, United States
- Texas Materials Institute, Center for Electrochemistry, University of Texas at Austin, Austin, Texas 78712-0231, United States
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Brandt AJ, Maddumapatabandi TD, Shakya DM, Xie K, Seuser GS, Farzandh S, Chen DA. Water-gas shift activity on Pt-Re surfaces and the role of the support. J Chem Phys 2019; 151:234714. [DOI: 10.1063/1.5128735] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Amy J. Brandt
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA
| | | | - Deependra M. Shakya
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA
| | - Kangmin Xie
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA
| | - Grant S. Seuser
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA
| | - Sharfa Farzandh
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA
| | - Donna A. Chen
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA
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Liu Z, Yao S, Johnston-Peck A, Xu W, Rodriguez JA, Senanayake SD. Methanol steam reforming over Ni-CeO2 model and powder catalysts: Pathways to high stability and selectivity for H2/CO2 production. Catal Today 2018. [DOI: 10.1016/j.cattod.2017.08.041] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Duke AS, Xie K, Brandt AJ, Maddumapatabandi TD, Ammal SC, Heyden A, Monnier JR, Chen DA. Understanding Active Sites in the Water–Gas Shift Reaction for Pt–Re Catalysts on Titania. ACS Catal 2017. [DOI: 10.1021/acscatal.7b00086] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Audrey S. Duke
- Department of Chemistry
and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Kangmin Xie
- Department of Chemistry
and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Amy J. Brandt
- Department of Chemistry
and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Thathsara D. Maddumapatabandi
- Department of Chemistry
and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Salai C. Ammal
- Department of Chemical Engineering, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Andreas Heyden
- Department of Chemical Engineering, University of South Carolina, Columbia, South Carolina 29208, United States
| | - John R. Monnier
- Department of Chemical Engineering, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Donna A. Chen
- Department of Chemistry
and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
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Araiza DG, Gómez-Cortés A, Díaz G. Reactivity of methanol over copper supported on well-shaped CeO2: a TPD-DRIFTS study. Catal Sci Technol 2017. [DOI: 10.1039/c7cy00984d] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Methoxy and formate species resulting from methanol adsorption on Cu supported on well-shaped CeO2 are morphology-dependent.
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Affiliation(s)
- Daniel G. Araiza
- Instituto de Física
- Universidad Nacional Autónoma de México
- Ciudad de México 04510
- México
| | - Antonio Gómez-Cortés
- Instituto de Física
- Universidad Nacional Autónoma de México
- Ciudad de México 04510
- México
| | - Gabriela Díaz
- Instituto de Física
- Universidad Nacional Autónoma de México
- Ciudad de México 04510
- México
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6
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Freitas I, Damyanova S, Oliveira D, Marques C, Bueno J. Effect of Cu content on the surface and catalytic properties of Cu/ZrO2 catalyst for ethanol dehydrogenation. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.molcata.2013.09.038] [Citation(s) in RCA: 82] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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7
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Sato A, Volanti D, Meira D, Damyanova S, Longo E, Bueno J. Effect of the ZrO2 phase on the structure and behavior of supported Cu catalysts for ethanol conversion. J Catal 2013. [DOI: 10.1016/j.jcat.2013.06.022] [Citation(s) in RCA: 201] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Mehmood F, Greeley J, Zapol P, Curtiss LA. Comparative Density Functional Study of Methanol Decomposition on Cu4 and Co4 Clusters. J Phys Chem B 2010; 114:14458-66. [DOI: 10.1021/jp101594z] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- F. Mehmood
- Materials Science Division and Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439
| | - J. Greeley
- Materials Science Division and Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439
| | - P. Zapol
- Materials Science Division and Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439
| | - L. A. Curtiss
- Materials Science Division and Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439
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Ratliff JS, Tenney SA, Hu X, Conner SF, Ma S, Chen DA. Decomposition of dimethyl methylphosphonate on Pt, Au, and Au-Pt clusters supported on TiO2(110). LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:216-225. [PMID: 19053659 DOI: 10.1021/la802361q] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The decomposition of dimethyl methylphosphonate (DMMP) was studied by temperature programmed desorption (TPD), X-ray photoelectron spectroscopy (XPS), and Auger electron spectroscopy (AES) on TiO(2)-supported Pt, Au, and Au-Pt clusters as well as on TiO(2)(110) itself. In agreement with previous work, TPD experiments for DMMP on TiO(2)(110) showed that methyl and methane were the main gaseous products. Multiple DMMP adsorption-reaction cycles on TiO(2)(110) demonstrated that active sites for DMMP decomposition were blocked after a single cycle, but some activity for methyl production was sustained even after five cycles. Furthermore, the activity of the TiO(2) surface could be regenerated by heating in O(2) at 800 K or heating in vacuum to 965 K to remove surface carbon and phosphorus, which are byproducts of DMMP decomposition. On 0.5 ML Pt clusters deposited on TiO(2)(110), TPD studies of DMMP reaction showed that CO and H(2) were the main gas products, with methyl and methane as minor products. The Pt clusters were more active than TiO(2) both in terms of the total amount of DMMP reaction and the ability to break C-H, P-O, and P-OCH(3) bonds in DMMP. However, the Pt clusters had no sustained activity for DMMP decomposition, since the product yields dropped to zero after a single adsorption-reaction cycle. This loss of activity is attributed to a combination of poisoning of active sites by surface phosphorus species and encapsulation of the Pt clusters by reduced titania after heating above 600 K due to strong metal support interactions (SMSI). On 0.5 ML Au clusters, CO and H(2) were also the main products detected in TPD experiments, in addition to methane and methyl produced from reaction on the support. The Au clusters were less active for DMMP decomposition to CO and H(2) as well as P-O bond scission, but surface phosphorus was removed from the Au clusters by desorption at approximately 900 K. Au-Pt bimetallic clusters on TiO(2)(110) were prepared by depositing 0.25 ML of Pt followed by 0.25 ML of Au, and the bimetallic surfaces exhibited activity intermediate between that of pure Pt and pure Au in terms of CO and H(2) desorption yields. However, there is evidence that the production of methane from DMMP decomposition occurs at Au-Pt sites.
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Affiliation(s)
- Jay S Ratliff
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA
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Welch CM, Hyde ME, Banks CE, Compton RG. The Detection of Nitrate Using in-situ Copper Nanoparticle Deposition at a Boron Doped Diamond Electrode. ANAL SCI 2005; 21:1421-30. [PMID: 16379380 DOI: 10.2116/analsci.21.1421] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Electrochemical deposition from a 0.1 M sodium sulphate solution, containing Cu2+ (adjusted to pH 3 with hydrochloric acid) produced a well defined copper nanoparticle deposit on the surface of a boron doped diamond electrode. Changing conditions such as potential (-0.8, -1.0 and -1.2 V), time (5, 2 and 0.5 s) and concentration of Cu2+ (500, 250 and 100 microM) was found to give copper nanoparticles of varying size and particle density. The electrocatalytic properties of the copper surface towards nitrate reduction were explored. An in-situ copper nanoparticle production method was developed for the detection of nitrate; this involves electrodeposition, followed by linear sweep voltammetry for the reduction of nitrate and then application of a stripping potential to renew the electrode surface. The linear sweep was discovered to have homogenised the size of the nanoparticles but their number density was still dependant on the initial conditions of deposition. Some particles were still present at the surface after the stripping potential had been applied but repetitions of the procedure showed these did not have an effect on subsequent deposits. Optimisation of the method lead to applying a deposition potential of -0.8 V, at a BDD electrode for 5 s in a 0.1 M sodium sulphate solution (pH 3) containing 100 microM Cu2+ followed by a linear sweep at 1 V/s; this yielded a limit of detection of 1.5 microM nitrate. The analytical applicability of the technique was evaluated for nitrate detection in a natural mineral water sample and was found to agree well with that stated by the manufacturer.
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Affiliation(s)
- Christine M Welch
- Physical and Theoretical Chemistry Laboratory, University of Oxford South Parks Road, Oxford, UK
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