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Bimetallic Cu-Pt catalysts over nanoshaped ceria for hydrogen production via methanol decomposition. Catal Today 2022. [DOI: 10.1016/j.cattod.2021.07.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Buendía F, Araiza DG, López-Rodríguez L, Paz-Borbón LO, Díaz G. Methanol interaction over Cu-Pt clusters supported on CeO2: Towards an understanding of adsorption sites. Catal Today 2022. [DOI: 10.1016/j.cattod.2021.10.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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3
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Ricciardulli T, Adams JS, DeRidder M, van Bavel AP, Karim AM, Flaherty DW. H2O-assisted O2 reduction by H2 on Pt and PtAu bimetallic nanoparticles: Influences of composition and reactant coverages on kinetic regimes, rates, and selectivities. J Catal 2021. [DOI: 10.1016/j.jcat.2021.10.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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4
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Pasquale L, Najafishirtari S, Brescia R, Scarpellini A, Demirci C, Colombo M, Manna L. Atmosphere-Induced Transient Structural Transformations of Pd-Cu and Pt-Cu Alloy Nanocrystals. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2021; 33:8635-8648. [PMID: 34853491 PMCID: PMC8619592 DOI: 10.1021/acs.chemmater.1c02377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 10/29/2021] [Indexed: 06/13/2023]
Abstract
We have investigated the transformations of colloidal Pd-Cu and Pt-Cu bimetallic alloy nanocrystals (NCs) supported on γ-Al2O3 when exposed to a sequence of oxidizing and then reducing atmospheres, in both cases at high temperature (350 °C). A combination of in situ diffuse reflectance infrared Fourier transform spectroscopy and X-ray absorption spectroscopy was employed to probe the NC surface chemistry and structural/compositional variations in response to the different test conditions. Depending on the type of noble metal in the bimetallic NCs (whether Pd or Pt), different outcomes were observed. The oxidizing treatment on Pd-Cu NCs led to the formation of a PdCuO mixed oxide and PdO along with a minor fraction of CuO x species on the support. The same treatment on Pt-Cu NCs caused a complete dealloying between Pt and Cu, forming separate Pt NCs with a minor fraction of PtO NCs and CuO x species, the latter finely dispersed on the support. The reducing treatment that followed the oxidizing treatment largely restored the Pd-Cu alloy NCs, although with a residual fraction of CuO x species remaining. Similarly, Pt-Cu NCs were partially restored but with a large fraction of CuO x species still located on the support. Our results indicate that the noble metal present in the bimetallic Cu-based alloy NCs has a strong influence on the dealloying/migrations/realloying processes occurring under typical heterogeneous catalytic reactions, elucidating the structural/compositional variations of these NCs depending on the atmospheres to which they are exposed.
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Affiliation(s)
- Lea Pasquale
- Department
of Nanochemistry, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy
- Dipartimento
di Chimica e Chimica Industriale, Università
degli Studi di Genova, Via Dodecaneso 31, 16146 Genova, Italy
| | - Sharif Najafishirtari
- Department
of Nanochemistry, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy
| | - Rosaria Brescia
- Electron
Microscopy Facility, Istituto Italiano di
Tecnologia, Via Morego 30 16163, Genova, Italy
| | - Alice Scarpellini
- Electron
Microscopy Facility, Istituto Italiano di
Tecnologia, Via Morego 30 16163, Genova, Italy
| | - Cansunur Demirci
- Department
of Nanochemistry, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy
- Dipartimento
di Chimica e Chimica Industriale, Università
degli Studi di Genova, Via Dodecaneso 31, 16146 Genova, Italy
| | - Massimo Colombo
- Department
of Nanochemistry, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy
| | - Liberato Manna
- Department
of Nanochemistry, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy
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Methanol decomposition over bimetallic Cu-M catalysts supported on nanoceria: Effect of the second metal on the catalytic properties. Catal Today 2020. [DOI: 10.1016/j.cattod.2019.04.076] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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6
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Promotional Effect of Cu, Fe and Pt on the Performance of Ni/Al2O3 in the Deoxygenation of Used Cooking Oil to Fuel-Like Hydrocarbons. Catalysts 2020. [DOI: 10.3390/catal10010091] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Inexpensive Ni-based catalysts can afford comparable performance to costly precious metal formulations in the conversion of fat, oil, or greases (FOG) to fuel-like hydrocarbons via decarboxylation/decarbonylation (deCOx). While the addition of certain metals has been observed to promote Ni-based deCOx catalysts, the steady-state performance of bimetallic formulations must be ascertained using industrially relevant feeds and reaction conditions in order to make meaningful comparisons. In the present work, used cooking oil (UCO) was upgraded to renewable diesel via deCOx over Ni/Al2O3 promoted with Cu, Fe, or Pt in a fixed-bed reactor at 375 °C using a weight hourly space velocity (WHSV) of 1 h−1. Although all catalysts fully deoxygenated the feed to hydrocarbons throughout the entire 76 h duration of these experiments, the cracking activity (and the evolution thereof) was distinct for each formulation. Indeed, that of the Ni-Cu catalyst was low and relatively stable, that of the Ni-Fe formulation was initially high but progressively dropped to become negligible, and that of the Ni-Pt catalyst started as moderate, varied considerably, and finished high. Analysis of the spent catalysts suggests that the evolution of the cracking activity can be mainly ascribed to changes in the composition of the metal particles.
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Affiliation(s)
- Francisco Zaera
- Department of Chemistry and
UCR Center for Catalysis, University of California, Riverside, California 92521, United States
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Buchwalter P, Rosé J, Braunstein P. Multimetallic catalysis based on heterometallic complexes and clusters. Chem Rev 2014; 115:28-126. [PMID: 25545815 DOI: 10.1021/cr500208k] [Citation(s) in RCA: 557] [Impact Index Per Article: 55.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Paulin Buchwalter
- Laboratoire de Chimie de Coordination (UMR 7177 CNRS), Institut Le Bel - Université de Strasbourg , 4, rue Blaise Pascal F-67081, Strasbourg, France
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9
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Song YJ, Monnier JR, Fanson PT, Williams CT. Bimetallic Ag–Ir/Al2O3 catalysts prepared by electroless deposition: Characterization and kinetic evaluation. J Catal 2014. [DOI: 10.1016/j.jcat.2014.04.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Anouti M, Jacquemin J. Structuring reductive media containing protic ionic liquids and their application to the formation of metallic nanoparticles. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2013.12.064] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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11
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Großmann K, Wicker S, Weimar U, Barsan N. Impact of Pt additives on the surface reactions between SnO2, water vapour, CO and H2; an operando investigation. Phys Chem Chem Phys 2013; 15:19151-8. [DOI: 10.1039/c3cp52782d] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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12
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Yu W, Porosoff MD, Chen JG. Review of Pt-Based Bimetallic Catalysis: From Model Surfaces to Supported Catalysts. Chem Rev 2012; 112:5780-817. [DOI: 10.1021/cr300096b] [Citation(s) in RCA: 951] [Impact Index Per Article: 79.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Weiting Yu
- Catalysis Center for Energy
Innovation, Department of Chemical and Bimolecular Engineering, University
of Delaware, Newark, Delaware 19716, United States
| | - Marc D. Porosoff
- Catalysis Center for Energy
Innovation, Department of Chemical and Bimolecular Engineering, University
of Delaware, Newark, Delaware 19716, United States
| | - Jingguang G. Chen
- Catalysis Center for Energy
Innovation, Department of Chemical and Bimolecular Engineering, University
of Delaware, Newark, Delaware 19716, United States
- Department of Chemical Engineering,
Columbia University, New York, New York 10027, United States
- Chemistry Department, Brookhaven
National Laboratory, Upton, New York 11973, United States
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Ohashi M, Beard KD, Ma S, Blom DA, St-Pierre J, Van Zee JW, Monnier JR. Electrochemical and structural characterization of carbon-supported Pt–Pd bimetallic electrocatalysts prepared by electroless deposition. Electrochim Acta 2010. [DOI: 10.1016/j.electacta.2010.06.068] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Gaikwad AV, Verschuren P, Kinge S, Rothenberg G, Eiser E. Matter of age: growing anisotropic gold nanocrystals in organic media. Phys Chem Chem Phys 2008; 10:951-6. [DOI: 10.1039/b715112h] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Gaikwad AV, Verschuren P, Eiser E, Rothenberg G. A Simple Method for Measuring the Size of Metal Nanoclusters in Solution. J Phys Chem B 2006; 110:17437-43. [PMID: 16942082 DOI: 10.1021/jp063644n] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The connection between quantum size effects and the surface plasmon resonance of metal nanoclusters is introduced and the pros and cons of in situ and ex situ cluster analysis methods are outlined. A new method for estimating the size of nanoclusters is presented. This method combines core/shell cluster synthesis, UV-visible spectroscopy, and Mie theory. The core/shell approach enables the estimation of metal cluster sizes directly from the UV-visible spectra, even for transition metal nanoclusters such as Pd that have no distinct surface-plasmon peak in UV-visible region. Pd/Au and Au/Pd core/shell clusters as well as Au-Pd alloy clusters are synthesized and used as test cases for simulations and spectroscopic measurements. The results of the simulations and UV-visible spectroscopy experiments are validated with transmission electron microscopy.
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Affiliation(s)
- Anil V Gaikwad
- van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands
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Tian WQ, Ge M, Gu F, Yamada T, Aoki Y. Binary Clusters AuPt and Au6Pt: Structure and Reactivity within Density Functional Theory. J Phys Chem A 2006; 110:6285-93. [PMID: 16686464 DOI: 10.1021/jp055506o] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Within density functional theory with the general gradient approximation for the exchange and correlation, the bimetallic clusters AuPt and Au(6)Pt have been studied for their structure and reactivity. The bond strength of AuPt lies between those of Au(2) and Pt(2), and it is closer to that of Au(2). The Pt atom is the reactive center in both AuPt and AuPt(+) according to electronic structure analysis. AuPt(+) is more stable than AuPt. Au(6)Pt prefers electronic states with low multiplicity. The most stable conformation of Au(6)Pt is a singlet and has quasi-planar hexagonal frame with Pt lying at the hexagonal center. The doping of Pt in Au cluster enhances the chemical regioselectivity of the Au cluster. The Pt atom essentially serves as electron donor and the Au atoms bonded to the Pt atom acts as electron acceptor in Au(6)Pt. The lowest triplet of edge-capped rhombus Au(6)Pt clusters is readily accessible with very small singlet-triplet energy gap (0.32 eV). O(2) prefers to adsorb on Au and CO prefers to adsorb on Pt. O(2) and CO have stronger adsorption on AuPt than they do on Au(6)Pt. CO has a much stronger adsorption on AuPt bimetallic cluster than O(2) does. The adsorption of CO on Pt modifies the geometry of AuPt bimetallic clusters.
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Affiliation(s)
- Wei Quan Tian
- State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, China.
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Mohamed AA, Burini A, Fackler JP. Mixed-Metal Triangular Trinuclear Complexes: Dimers of Gold−Silver Mixed-Metal Complexes from Gold(I) Carbeniates and Silver(I) 3,5-Diphenylpyrazolates. J Am Chem Soc 2005; 127:5012-3. [PMID: 15810823 DOI: 10.1021/ja0429869] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Dimers of trinuclear mixed gold-silver compounds are obtained by the reaction of a gold(I) carbeniate, [Au(mu-C(OEt)=NC6H4-p-CH3)]3, with a silver(I) pyrazolate, [Ag(mu-3,5-Ph2pz)]3. The crystalline products are the mixed-metal species Au(carb)Ag2(mu-3,5-Ph2pz)2 and Au2(carb)2Ag(mu-3,5-Ph2pz)CCH2Cl2.
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Affiliation(s)
- Ahmed A Mohamed
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, USA
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Lang H, Maldonado S, Stevenson KJ, Chandler BD. Synthesis and Characterization of Dendrimer Templated Supported Bimetallic Pt−Au Nanoparticles. J Am Chem Soc 2004; 126:12949-56. [PMID: 15469292 DOI: 10.1021/ja046542o] [Citation(s) in RCA: 256] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Bimetallic dendrimer-stabilized nanoparticles (DSNs) were used to prepare supported Pt-Au catalysts within the bulk miscibility gap for this binary system. Hydroxy-terminated generation 5 PAMAM dendrimers were used to prepare Cu(0) nanoparticles (NPs). The Cu(0) NPs were subsequently used to reduce K(2)PtCl(4) and HAuCl(4), preparing stabilized bimetallic Pt-Au NPs with a 1:1 stoichiometry. The stabilized NPs were adsorbed onto a high surface area silica support and thermally activated to remove the dendrimers. Transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), and infrared spectroscopy of adsorbed CO showed that this preparation route resulted in NPs in which the two metals are intimately mixed and that the majority of the bimetallic NPs were smaller than 3 nm. Further, the bimetallic NPs were highly active for CO oxidation catalysis near room temperature and showed evidence of CO induced restructuring at ambient temperatures.
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Affiliation(s)
- Huifang Lang
- Department of Chemistry, Trinity University, One Trinity Place, San Antonio, TX 78212-7200, USA
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Borovkov VY, Luebke DR, Kovalchuk VI, d'Itri JL. Hydrogen-Assisted 1,2-Dichloroethane Dechlorination Catalyzed by Pt−Cu/SiO2: Evidence for Different Functions of Pt and Cu Sites. J Phys Chem B 2003. [DOI: 10.1021/jp0300389] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Victor Yu. Borovkov
- Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
| | - David R. Luebke
- Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
| | - Vladimir I. Kovalchuk
- Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
| | - Julie L. d'Itri
- Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
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20
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Affiliation(s)
- O. S. Alexeev
- Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616
| | - B. C. Gates
- Department of Chemical Engineering and Materials Science, University of California, Davis, California 95616
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22
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Zwijnenburg A, Saleh M, Makkee M, Moulijn JA. Direct gas-phase epoxidation of propene over bimetallic Au catalysts. Catal Today 2002. [DOI: 10.1016/s0920-5861(01)00478-3] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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