1
|
Synergistic Effects of Bimetallic AuPd and La2O3 in the Catalytic Reduction of NO with CO. Catalysts 2021. [DOI: 10.3390/catal11080916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Bimetallic AuPd nanoparticles supported on TiO2 are known to catalyze the reduction of NO with CO. Here, we investigated the effects of the addition of lanthanum oxide to a AuPd/TiO2 catalyst with a AuPd particle size of 2.1–2.2 nm. The addition of La2O3 enhanced the catalytic activity; for example, at 250 °C, there was 40.9% NO conversion and 49.3% N2-selectivity for AuPd/TiO2, and 100% NO conversion and 100% N2-selectivity for AuPd-La (1:1)/TiO2. The temperature requiring 100% NO conversion dropped from 400 °C to 200 °C by the simple post-impregnation of La2O3 onto AuPd/TiO2. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) combined with modulation excitation spectroscopy (MES) demonstrated that CO adsorption occurs first on Au atoms and then, within 80 s, moves onto Pd atoms. This transformation between two adsorption sites was facilitated by the addition of La2O3.
Collapse
|
2
|
Potassium persulfate as an effective oxidizer for chemical mechanical polishing of GCr15 bearing steel. J APPL ELECTROCHEM 2021. [DOI: 10.1007/s10800-021-01540-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
3
|
Biswas S, Pal A, Pal T. Supported metal and metal oxide particles with proximity effect for catalysis. RSC Adv 2020; 10:35449-35472. [PMID: 35515660 PMCID: PMC9056907 DOI: 10.1039/d0ra06168a] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Accepted: 09/08/2020] [Indexed: 11/21/2022] Open
Abstract
External influence is essential for any change to occur in this world. Similarly, the reaction path of a chemical reaction can be changed with the addition of a catalyst from outside. Sometimes a catalyst performs better when it remains associated with an inert substance, which is called a support material (SM). Improved catalyst accomplishment arises from the 'proximity effect'. Even inert supports play a role in better product formulation or environmental remediation. In this review, it has been shown how the SM, as a nest, aids the catalyst particle synergistically to perform a good job in a chemical reaction. The structure-function relationship of SM helps in catalyst activation to some extent, and produces active centres that are difficult to fully ascertain. In the text, Langmuir-Hinshelwood (L-H), Mars-van Krevelen (MVK), and Eley-Rideal (E-R) mechanisms are highlighted for the adsorption processes as the case may be. Again, the importance of SM for both catalyst and substrates has been consolidated here in the text. Finally, the role of the initiator and the promoter is also discussed in this review.
Collapse
Affiliation(s)
- Subhadeep Biswas
- Department of Civil Engineering, Indian Institute of Technology Kharagpur 721302 India
| | - Anjali Pal
- Department of Civil Engineering, Indian Institute of Technology Kharagpur 721302 India
| | - Tarasankar Pal
- Department of Chemical Sciences, University of Johannesburg Auckland Park South Africa
| |
Collapse
|
4
|
Zhang B, Huang Y, Vinluan R, Wang S, Cui C, Lu X, Peng C, Zhang M, Zheng J, Gao PX. Enhancing ZnO nanowire gas sensors using Au/Fe 2O 3 hybrid nanoparticle decoration. NANOTECHNOLOGY 2020; 31:325505. [PMID: 32299070 DOI: 10.1088/1361-6528/ab89cf] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Heterojunctions are an important strategy for designing high performance electrical sensor materials and related devices. Herein, a new type of metal-semiconductor hybrid nanoparticle has been successfully used to remarkably sensitize the surface of ZnO nanowires for detecting NO2 with high responses over a broad temperature window ranging from room temperature to 600 °C. These hybrid nanoparticles are comprised of iron oxide nanowires with well dispersed single crystalline Au nanoparticles. The hybrid nanoparticle decorated ZnO nanowires have achieved a giant response, as high as 74 500 toward NO2 gas, about 42 times that of Au decorated ZnO nanowire sensors. This dramatic enhancement may be attributed to the efficient charge transfer across the Au-Fe2O3 Schottky and Fe2O3-ZnO semiconductor heterojunction interfaces. Due to the incorporation of thermally-stable Fe2O3 nanoparticles as the support of Au nanoparticles, the working temperature of nanowire sensors was successfully extended to higher temperatures, with an increase of 200 °C, from 400 °C to 600 °C. Such a combination of semiconductor heterojunction and semiconductor-metal Schottky contact presents a new strategy for designing high performance electrical sensors with high sensitivity, stability, selectivity, and wide operation temperature window, which are potentially suitable for advanced energy systems such as automotive engines and power plants.
Collapse
Affiliation(s)
- Bo Zhang
- Department of Materials Science and Engineering & Institute of Materials Science, University of Connecticut, Storrs, CT 06269-3136, United States of America
| | | | | | | | | | | | | | | | | | | |
Collapse
|
5
|
Bathomarco CG, Franke KN, Ferreira AP. Aspects of the interaction between Au and Fe in supported catalysts applied to the preferential CO oxidation. Catal Today 2020. [DOI: 10.1016/j.cattod.2018.12.025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
6
|
Zhu X, Wang D, Li Z, Ma W. Enhanced activity for gas phase propylene oxide rearrangement to allyl alcohol by Au promotion of Li3PO4 catalyst. J SOLID STATE CHEM 2019. [DOI: 10.1016/j.jssc.2019.120922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
7
|
Marques Mota F, Nguyen DLT, Lee JE, Piao H, Choy JH, Hwang YJ, Kim DH. Toward an Effective Control of the H2 to CO Ratio of Syngas through CO2 Electroreduction over Immobilized Gold Nanoparticles on Layered Titanate Nanosheets. ACS Catal 2018. [DOI: 10.1021/acscatal.8b00647] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Filipe Marques Mota
- Department of Chemistry and Nano Science, Division of Molecular and Life Sciences, College of Natural Sciences, Ewha Womans University, 52, Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Republic of Korea
| | - Dang Le Tri Nguyen
- Clean Energy Research Center, Korea Institute of Science and Technology (KIST), 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
- Division of Energy and Environmental Technology, KIST School, Korea University of Science and Technology (UST), 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
| | - Ji-Eun Lee
- Department of Chemistry and Nano Science, Division of Molecular and Life Sciences, College of Natural Sciences, Ewha Womans University, 52, Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Republic of Korea
| | - Huiyan Piao
- Department of Chemistry and Nano Science, Division of Molecular and Life Sciences, College of Natural Sciences, Ewha Womans University, 52, Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Republic of Korea
- Center for Intelligent Nano-Bio Materials (CINBM), Department of Chemistry and Nano Science, Division of Molecular and Life Sciences, College of Natural Sciences, Ewha Womans University, 52, Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Republic of Korea
| | - Jin-Ho Choy
- Department of Chemistry and Nano Science, Division of Molecular and Life Sciences, College of Natural Sciences, Ewha Womans University, 52, Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Republic of Korea
- Center for Intelligent Nano-Bio Materials (CINBM), Department of Chemistry and Nano Science, Division of Molecular and Life Sciences, College of Natural Sciences, Ewha Womans University, 52, Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Republic of Korea
| | - Yun Jeong Hwang
- Clean Energy Research Center, Korea Institute of Science and Technology (KIST), 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
- Division of Energy and Environmental Technology, KIST School, Korea University of Science and Technology (UST), 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
| | - Dong Ha Kim
- Department of Chemistry and Nano Science, Division of Molecular and Life Sciences, College of Natural Sciences, Ewha Womans University, 52, Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Republic of Korea
- Division of Chemical Engineering and Materials Science, College of Engineering, Ewha Womans University, 52, Ewhayeodae-gil, Seodaemun-gu, Seoul 03760, Republic of Korea
| |
Collapse
|
8
|
Smirnov MY, Vovk EI, Kalinkin AV, Bukhtiyarov VI. Effect of the Composition of the Reaction Atmosphere on the Thermal Stability of Highly Dispersed Gold Particles on an Oxide Support (Au/Fe2O3 System). KINETICS AND CATALYSIS 2018. [DOI: 10.1134/s0023158417060106] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
9
|
Yepez A, Prinsen P, Pineda A, Balu AM, Garcia A, Lam FLY, Luque R. A comprehensive study on the continuous flow synthesis of supported iron oxide nanoparticles on porous silicates and their catalytic applications. REACT CHEM ENG 2018. [DOI: 10.1039/c8re00063h] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The present work demonstrates an efficient continuous flow methodology for the preparation of iron oxide nanoparticles supported on porous silicates.
Collapse
Affiliation(s)
- Alfonso Yepez
- Departamento de Química Orgánica
- Universidad de Córdoba
- Córdoba
- Spain
| | - Pepijn Prinsen
- Departamento de Química Orgánica
- Universidad de Córdoba
- Córdoba
- Spain
| | - Antonio Pineda
- Departamento de Química Orgánica
- Universidad de Córdoba
- Córdoba
- Spain
| | - Alina M. Balu
- Departamento de Química Orgánica
- Universidad de Córdoba
- Córdoba
- Spain
| | - Angel Garcia
- Departamento de Química Orgánica
- Universidad de Córdoba
- Córdoba
- Spain
| | - Frank L. Y. Lam
- Department of Chemical and Biomolecular Engineering
- Hong Kong University of Science and Technology
- Kowloon
- Hong Kong
| | - Rafael Luque
- Departamento de Química Orgánica
- Universidad de Córdoba
- Córdoba
- Spain
- Peoples Friendship University of Russia (RUDN University)
| |
Collapse
|
10
|
Investigation of the calcination temperature effect on the interaction between Au nanoparticles and the catalytic support α-Fe 2 O 3 for the low temperature CO oxidation. J Taiwan Inst Chem Eng 2017. [DOI: 10.1016/j.jtice.2017.03.032] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
11
|
Widmann D, Behm RJ. Formation and removal of active oxygen species for the non-catalytic CO oxidation on Au/TiO 2 catalysts. CHINESE JOURNAL OF CATALYSIS 2016. [DOI: 10.1016/s1872-2067(16)62452-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
12
|
Liu Z, Huang Z, Cheng F, Guo Z, Wang G, Chen X, Wang Z. Efficient Dual-Site Carbon Monoxide Electro-Catalysts via Interfacial Nano-Engineering. Sci Rep 2016; 6:33127. [PMID: 27650532 PMCID: PMC5030650 DOI: 10.1038/srep33127] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Accepted: 08/19/2016] [Indexed: 11/09/2022] Open
Abstract
Durable, highly efficient, and economic sound electrocatalysts for CO electrooxidation (COE) are the emerging key for wide variety of energy solutions, especially fuel cells and rechargeable metal-air batteries. Herein, we report the novel system of nickel-aluminum double layered hydroxide (NiAl-LDH) nanoplates on carbon nanotubes (CNTs) network. The formulation of such complexes system was to be induced through the assistance of gold nanoparticles in order to form dual-metal active sites so as to create a extended Au/NiO two phase zone. Bis (trifluoromethylsulfonyl)imide (NTf2) anion of ionic liquid electrolyte was selected to enhance the CO/O2 adsorption and to facilitate electro-catalyzed oxidation of Ni (OH)2 to NiOOH by increasing the electrophilicity of catalytic interface. The resulting neutral catalytic system exhibited ultra-high electrocatalytic activity and stability for CO electrooxidation than commercial and other reported precious metal catalysts. The turnover frequency (TOF) of the LDH-Au/CNTs COE catalyst was much higher than the previous reported other similar electrocatalysts, even close to the activity of solid-gas chemical catalysts at high temperature. Moreover, in the long-term durability testing, the negligible variation of current density remains exsisting after 1000 electrochemistry cycles.
Collapse
Affiliation(s)
- Zhen Liu
- Department of Chemistry, Xavier University of Louisiana, New Orleans, LA 70125, USA
- Department of Physics & Engineering, Frostburg State University, Frostburg, MD 21532-2303, USA
- Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA
| | - Zhongyuan Huang
- Department of Chemistry, Xavier University of Louisiana, New Orleans, LA 70125, USA
| | - Feifei Cheng
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Zhanhu Guo
- Integrated Composites Laboratory (ICL), Department of Chemical & Biomolecular Engineering, University of Tennessee, Knoxville, TN 37996, USA
| | - Guangdi Wang
- Department of Chemistry, Xavier University of Louisiana, New Orleans, LA 70125, USA
| | - Xu Chen
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Zhe Wang
- Department of Chemistry, Xavier University of Louisiana, New Orleans, LA 70125, USA
| |
Collapse
|
13
|
Villa A, Dimitratos N, Chan-Thaw CE, Hammond C, Veith GM, Wang D, Manzoli M, Prati L, Hutchings GJ. Characterisation of gold catalysts. Chem Soc Rev 2016; 45:4953-94. [DOI: 10.1039/c5cs00350d] [Citation(s) in RCA: 118] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Au-based catalysts have established a new important field of catalysis, revealing specific properties in terms of both high activity and selectivity for many reactions.
Collapse
Affiliation(s)
- Alberto Villa
- Dipartimento di Chimica
- Università degli studi di Milano
- Milano
- Italy
| | | | | | | | - Gabriel M. Veith
- Materials Science and Technology Division
- Oak Ridge National Laboratory
- Oak Ridge
- USA
| | - Di Wang
- Institute of Nanotechnology and Karlsruhe Nano Micro Facility Karlsruhe Institute of Technology (KIT)
- 76344 Eggenstein-Leopoldshafen
- Germany
| | - Maela Manzoli
- Dipartimento di Chimica
- Università degli Studi di Torino
- Torino
- Italy
| | - Laura Prati
- Dipartimento di Chimica
- Università degli studi di Milano
- Milano
- Italy
| | | |
Collapse
|
14
|
Borshch VN, Pugacheva EV, Zhuk SY, Sanin VN, Andreev DE, Yukhvid VI, Eliseev OL, Kazantsev RV, Kolesnikov SI, Kolesnikov IM, Lapidus AL. Polymetallic catalysts for the Fischer–Tropsch synthesis and hydrodesulfurization prepared using self-propagating high-temperature synthesis. KINETICS AND CATALYSIS 2015. [DOI: 10.1134/s0023158415050031] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
15
|
Liu CH, Liu RH, Sun QJ, Chang JB, Gao X, Liu Y, Lee ST, Kang ZH, Wang SD. Controlled synthesis and synergistic effects of graphene-supported PdAu bimetallic nanoparticles with tunable catalytic properties. NANOSCALE 2015; 7:6356-62. [PMID: 25786139 DOI: 10.1039/c4nr06855f] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Graphene-supported bimetallic nanoparticles are promising nanocatalysts, which can show strong and tunable catalytic activity and selectivity. Herein room-temperature-ionic-liquid-assisted metal sputtering is utilized to synthesize PdAu bimetallic nanoparticles on graphene with bare surface, small size, high surface density and controlled Pd-to-Au ratio. This controllable synthetic approach is green-chemistry compatible and totally free of additives and byproducts. The supported PdAu nanoparticles show excellent catalytic capabilities for both oxidation and reduction reactions, strongly dependent on the Pd-to-Au ratio. A strong correlation among catalytic performance, bimetallic composition and charge redistribution in the PdAu nanoparticles has been demonstrated. The results suggest that sufficient Au d-holes appear to be significant to the catalysis of oxidation reaction, and a metallic Pd surface is critical to the catalysis of reduction reaction. By the present method, the bimetallic combination can be tailored for distinct types of catalytic reactions.
Collapse
Affiliation(s)
- Chang-Hai Liu
- Soochow University-Western University Joint Centre for Synchrotron Radiation Research, Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, P. R. China.
| | | | | | | | | | | | | | | | | |
Collapse
|
16
|
Luo W, Sankar M, Beale AM, He Q, Kiely CJ, Bruijnincx PCA, Weckhuysen BM. High performing and stable supported nano-alloys for the catalytic hydrogenation of levulinic acid to γ-valerolactone. Nat Commun 2015; 6:6540. [PMID: 25779385 PMCID: PMC4382690 DOI: 10.1038/ncomms7540] [Citation(s) in RCA: 158] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Accepted: 02/06/2015] [Indexed: 12/23/2022] Open
Abstract
The catalytic hydrogenation of levulinic acid, a key platform molecule in many biorefinery schemes, into γ-valerolactone is considered as one of the pivotal reactions to convert lignocellulose-based biomass into renewable fuels and chemicals. Here we report on the development of highly active, selective and stable supported metal catalysts for this reaction and on the beneficial effects of metal nano-alloying. Bimetallic random alloys of gold-palladium and ruthenium-palladium supported on titanium dioxide are prepared with a modified metal impregnation method. Gold-palladium/titanium dioxide shows a marked,~27-fold increase in activity (that is, turnover frequency of 0.1 s−1) compared with its monometallic counterparts. Although ruthenium-palladium/titanium dioxide is not only exceptionally active (that is, turnover frequency of 0.6 s−1), it shows excellent, sustained selectivity to γ-valerolactone (99%). The dilution and isolation of ruthenium by palladium is thought to be responsible for this superior catalytic performance. Alloying, furthermore, greatly improves the stability of both supported nano-alloy catalysts. The hydrogenation of leuvinic acid to γ-valerolactone is an important step in the conversion of lignocellulose to high value chemicals. Here, the authors report that bimetallic alloys are active and stable catalysts for this reaction, and attribute this to geometric and electronic effects.
Collapse
Affiliation(s)
- Wenhao Luo
- Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
| | - Meenakshisundaram Sankar
- Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
| | - Andrew M Beale
- 1] Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands [2] UK Catalysis Hub, Research Complex at Harwell, Rutherford Appleton Laboratory, Oxfordshire OX11 0QX, UK [3] Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK
| | - Qian He
- Department of Materials Science and Engineering, Lehigh University, 5 East Packer Avenue, Bethlehem, Pennsylvania 18015, USA
| | - Christopher J Kiely
- Department of Materials Science and Engineering, Lehigh University, 5 East Packer Avenue, Bethlehem, Pennsylvania 18015, USA
| | - Pieter C A Bruijnincx
- Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
| | - Bert M Weckhuysen
- Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
| |
Collapse
|
17
|
Sohn Y, Pradhan D, Kang JS, Leung KT. Nanoscale architecture of bimetallic hybrid Fe–Au nanostructures with and without 1,4-phenylene diisocyanide pre-functionalization. RSC Adv 2015. [DOI: 10.1039/c5ra02564h] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The nanoscale architecture of a hybrid material has been very important in deriving a new interesting synergic property.
Collapse
Affiliation(s)
- Youngku Sohn
- WATLab and Department of Chemistry
- University of Waterloo
- Waterloo
- Canada
- Department of Chemistry
| | - Debabrata Pradhan
- WATLab and Department of Chemistry
- University of Waterloo
- Waterloo
- Canada
- Materials Science Center
| | - Jung-Soo Kang
- WATLab and Department of Chemistry
- University of Waterloo
- Waterloo
- Canada
| | - K. T. Leung
- WATLab and Department of Chemistry
- University of Waterloo
- Waterloo
- Canada
| |
Collapse
|
18
|
Yepez A, Lam FLY, Romero AA, Kappe CO, Luque R. Continuous Flow Preparation of Iron Oxide Nanoparticles Supported on Porous Silicates. ChemCatChem 2014. [DOI: 10.1002/cctc.201402802] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
19
|
Kitayama Y, Takeuchi T. Synthesis of CO2/N2-triggered reversible stability-controllable poly(2-(diethylamino)ethyl methacrylate)-grafted-AuNPs by surface-initiated atom transfer radical polymerization. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:12684-12689. [PMID: 25268967 DOI: 10.1021/la502801t] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
CO2/N2-triggered stability-controllable gold nanoparticles (AuNPs) grafted with poly(2-(diethylamino)ethyl methacrylate) (PDEAEMA) layers (PDEAEMA-g-AuNPs) were synthesized by the surface-initiated atom transfer radical polymerization of DEAEMA with AuNPs bearing the bis[2-(2-bromoisobutyryloxy)undecyl] layer (grafting from method). Extension of the PDEAEMA chain length increased the stability of the PDEAEMA-g-AuNPs in CO2-bubbled water because of the electrosteric repulsion of the protonated PDEAEMA layer. The chain-length-dependent stability of PDEAEMA-g-AuNPs was confirmed by DLS and UV-vis spectra by using the localized surface plasmon resonance property of the AuNPs, where the extinction wavelength was shifted toward shorter wavelength with increasing PDEAEMA chain length. The reversible stability change with the gas stimuli of CO2/N2 was also successfully demonstrated. Finally, the transfer across the immiscible interface between water and organic solvent was successfully demonstrated by N2-triggered insolubilization of PDEAEMA layer on AuNPs in the aqueous phase, leading to the successful collection of AuNPs using organic solvent from the aqueous phase. Our "grafting from" method of reversible stability-controllable AuNPs can be applied to develop advanced materials such as reusable optical AuNP-based nanosensors because the molecular recognition layer can be constructed by two-step polymerization.
Collapse
Affiliation(s)
- Yukiya Kitayama
- Graduate School of Engineering, Kobe University , 1-1, Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan
| | | |
Collapse
|
20
|
Gondo T, Kaneko K, Nishiyama T, Yamada K, Saghi Z, Barnard JS, Midgley PA. Microstructural analysis of Au/TiO2-SBA-15 nanocomposite. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2014; 20:1001-1007. [PMID: 24786633 DOI: 10.1017/s1431927614000841] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Properties of gold nanoparticles (AuNPs) are very different from bulk gold, in particular, highly dispersed AuNPs exhibit high catalytic activities on metal oxide supports. Catalytic activities of AuNPs are strongly dependent on: (i) size and morphology; (ii) synthesis methods; (iii) nature of the support; (iv) interaction between AuNPs and the support; and (v) oxidation state of AuNPs in the synthesized catalysts. A goal is to maintain the size and to prohibit aggregation of AuNPs, since aggregations deteriorate catalytic activities. Some strong interactions are therefore required between AuNPs and their supports to prevent the movement of AuNPs. SBA-15 is a promising material for the support of AuNPs since it has ordered two-dimensional hexagonal pore channels, uniform pore size ranging from 5 to 30 nm, narrow pore size distribution, thick amorphous walls ranging from 3 to 6 nm, and high surface area. In this study, SBA-15, TiO2-SBA-15 and TiO2-SBA-15-AuNP nanocomposites were synthesized by the sol-gel method and microstructural characterizations were carried out by both X-ray diffraction analysis and electron microscopy.
Collapse
Affiliation(s)
- Takashi Gondo
- 1Department of Material Science and Engineering,Kyushu University,744 Motooka,Nishiku,Fukuoka 819-0395,Japan
| | - Kenji Kaneko
- 1Department of Material Science and Engineering,Kyushu University,744 Motooka,Nishiku,Fukuoka 819-0395,Japan
| | - Takeshi Nishiyama
- 1Department of Material Science and Engineering,Kyushu University,744 Motooka,Nishiku,Fukuoka 819-0395,Japan
| | - Kazuhiro Yamada
- 1Department of Material Science and Engineering,Kyushu University,744 Motooka,Nishiku,Fukuoka 819-0395,Japan
| | - Zineb Saghi
- 2Department of Materials Science and Metallurgy,University of Cambridge,27 Charles Babbage Road,Cambridge,CB3 0FS,UK
| | - Jonathan S Barnard
- 2Department of Materials Science and Metallurgy,University of Cambridge,27 Charles Babbage Road,Cambridge,CB3 0FS,UK
| | - Paul A Midgley
- 2Department of Materials Science and Metallurgy,University of Cambridge,27 Charles Babbage Road,Cambridge,CB3 0FS,UK
| |
Collapse
|
21
|
|
22
|
Martínez JJ, Rojas H, Vargas L, Parra C, Brijaldo MH, Passos FB. Hydrogenation of m-dinitrobenzene over Au catalysts on magnetic supports. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.molcata.2013.11.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
23
|
Mizera J, Spiridis N, Socha R, Grabowski R, Samson K, Korecki J, Grzybowska B, Gurgul J, Kępiński L, Małecka M. Au/FeOx catalysts of different degree of iron oxide reduction. Catal Today 2012. [DOI: 10.1016/j.cattod.2012.01.031] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
24
|
CuxCryOz mixed oxide as a promising support for gold – The effect of Au loading method on the effectiveness in oxidation reactions. Catal Today 2012. [DOI: 10.1016/j.cattod.2011.09.042] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
25
|
|
26
|
Au/MCr2O4 (M = Co, Mn, Fe) catalysts in the oxidations of CO, C2, and C3 hydrocarbons. REACTION KINETICS MECHANISMS AND CATALYSIS 2011. [DOI: 10.1007/s11144-011-0377-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
27
|
Total CO oxidation over Fe-containing Au/HMS catalysts: Effects of gold loading and catalyst pretreatment. Catal Today 2011. [DOI: 10.1016/j.cattod.2011.02.067] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
28
|
Zou X, Xu J, Qi S, Suo Z, An L, Li F. Effects of preparation conditions of Au/FeOx/Al2O3 catalysts prepared by a modified two-step method on the stability for CO oxidation. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/s1003-9953(10)60150-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
29
|
Preferential oxidation of CO in H2 rich stream (PROX) over gold catalysts supported on doped ceria: Effect of preparation method and nature of dopant. Catal Today 2010. [DOI: 10.1016/j.cattod.2010.06.017] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
30
|
Plashnitsa VV, Elumalai P, Fujio Y, Miura N. Zirconia-based electrochemical gas sensors using nano-structured sensing materials aiming at detection of automotive exhausts. Electrochim Acta 2009. [DOI: 10.1016/j.electacta.2008.12.040] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
31
|
Beck A, Horváth A, Stefler G, Katona R, Geszti O, Tolnai G, Liotta L, Guczi L. Formation and structure of Au/TiO2 and Au/CeO2 nanostructures in mesoporous SBA-15. Catal Today 2008. [DOI: 10.1016/j.cattod.2008.05.039] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
32
|
Jianxin W, Laitao L. A Comparative Study of Partial Oxidation of Methanol over Zinc Oxide Supported Metallic Catalysts. Catal Letters 2008. [DOI: 10.1007/s10562-008-9624-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
33
|
Imai H, Daté M, Tsubota S. Preferential Oxidation of CO in H2-Rich Gas at Low Temperatures over Au Nanoparticles Supported on Metal Oxides. Catal Letters 2008. [DOI: 10.1007/s10562-008-9501-x] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
34
|
Zanella R, Sandoval A, Santiago P, Basiuk VA, Saniger JM. New preparation method of gold nanoparticles on SiO2. J Phys Chem B 2007; 110:8559-65. [PMID: 16640406 DOI: 10.1021/jp060601y] [Citation(s) in RCA: 104] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
It is shown that adsorption of the [Au(en)(2)](3+) cationic complex can be successfully employed for the deposition of gold nanoparticles (1.5 to 3 nm) onto SiO(2) with high metal loading, good dispersion, and small Au particle size. When the solution pH increases (from 3.8 to 10.5), the Au loading in the Au/SiO(2) samples increases proportionally (from 0.2 to 5.5 wt %), and the average gold particle size also increases (from 1.5 to 2.4 nm). These effects are explained by the increase in the amount of negatively charged sites present on the SiO(2) surface, namely, when the solution pH increases, a higher number of [Au(en)(2)](3+) species can be adsorbed. Extending the adsorption time from 2 to 16 h gives rise to an increase in the gold loading from 3.3 to 4.0 wt % and in the average particle size from 1.8 to 2.9 nm. Different morphologies of gold nanoparticles are present as a function of the particle size. Particles with a size of 3-5 nm show defective structure, some of them having a multiple twinning particle (MTP) structure. At the same time, nanoparticles with an average size of ca. 2 nm exhibit defect-free structure with well-distinguishable {111} family planes. TEM and HAADF observations revealed that Au particles do not agglomerate on the SiO(2) support: gold is present on the surface of SiO(2) only as small particles. Density functional theory calculations were employed to study the mechanisms of [Au(en)(2)](3+) adsorption, where neutral and negatively charged silica surfaces were simulated by neutral cluster Si(4)O(10)H(4) and negatively charged cluster Si(4)O(10)H(3), respectively. The calculation results are totally consistent with the suggestion that the deposition of gold takes place according to a cationic adsorption mechanism.
Collapse
Affiliation(s)
- Rodolfo Zanella
- Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Universidad Nacional Autónoma de México (UNAM), Circuito Exterior S/N, A. P. 70-186, C. P. 04510, Ciudad Universitaria, México D. F., Mexico. zanella@ aleph.cinstrum.unam.mx
| | | | | | | | | |
Collapse
|
35
|
Moma JA, Scurrell MS, Jordaan WA. Effects of incorporation of ions into Au/TiO2 catalysts for carbon monoxide oxidation. Top Catal 2007. [DOI: 10.1007/s11244-007-0290-z] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
36
|
Temporal analysis of products (TAP) study on low temperature carbon monoxide oxidation on supported Au catalysts. Top Catal 2007. [DOI: 10.1007/s11244-007-0287-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
37
|
|
38
|
|
39
|
A Study of Water Influence on Carbon Monoxide Adsorption and Oxidation on Nanocrystals of: γ-Fe 2O 3, Au/Fe 2O 3 and Mn xZn 1-xFe 2O 4. ACTA ACUST UNITED AC 2006. [DOI: 10.4028/www.scientific.net/msf.518.85] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this paper the adsorption and oxidation of CO on nanocrystalline Au/γ-Fe2O3, Au/α-
Fe2O3, γ-Fe2O3 and a series of mixed ferrite with MnxZn1-xFe2O4 composition are investigated. The
catalysts were prepared by co-precipitation method and characterized using X-ray diffraction
(XRPD), specific surface (BET), transition electron spectroscopy (TEM) and magnetization
measurements. A temperature programmed desorption (TPD) study of the water and CO interaction
with nanocrystalline adsorbents is presented. The catalytic activities towards CO oxidation
increased in the following order: γ-Fe2O3 < MnxZn1-xFe2O4 < Au/γ-Fe2O3 .
Collapse
|
40
|
Šmit G, Zrnčević S, Lázár K. Adsorption and low-temperature oxidation of CO over iron oxides. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.molcata.2006.02.051] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
41
|
A comparative study of CO adsorption and oxidation on Au/Fe2O3 catalysts by FT-IR and in situ DRIFTS spectroscopies. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.molcata.2006.02.058] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
42
|
Wang S, Huang J, Geng L, Zhu B, Wang X, Wu S, Zhang S, Huang W. Tin Dioxide Supported Nanometric Gold: Synthesis, Characterization, and Lowtemperature Catalytic Oxidation of CO. Catal Letters 2006. [DOI: 10.1007/s10562-006-0017-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
43
|
Ruszel M, Grzybowska B, Samson K, Gressel I, Klisińska A. MIICr2O4-spinels as supports for Au nanoparticles in oxidation of CO. Catal Today 2006. [DOI: 10.1016/j.cattod.2005.11.055] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
44
|
Grzybowska-Świerkosz B. Nano-Au/oxide support catalysts in oxidation reactions: Provenance of active oxygen species. Catal Today 2006. [DOI: 10.1016/j.cattod.2005.11.051] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
45
|
Lee SY, Harris MT. Surface modification of magnetic nanoparticles capped by oleic acids: characterization and colloidal stability in polar solvents. J Colloid Interface Sci 2005; 293:401-8. [PMID: 16054635 DOI: 10.1016/j.jcis.2005.06.062] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2005] [Revised: 06/10/2005] [Accepted: 06/16/2005] [Indexed: 11/19/2022]
Abstract
The lyophobic surface of monodisperse magnetic nanoparticles capped by oleic acid was made to be more lyophilic by ozonolysis to increase the stability of the suspension in polar solvents like ethanol. The ozone oxidatively cleaved the double bond of oleic acid to form carbonyl and carboxyl groups on the surface of the nanoparticles. Additionally, interfacial ligand exchange of the capping molecules was applied to make the hydrophobic particle surface more hydrophilic. The magnetic particles showed enhanced miscibility and short-term stability in water after interfacial ligand exchange. The structure changes of the capping molecules on the nanoparticle surfaces were investigated using Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS). From these spectroscopy studies, the cleavage of the oleic acid and the formations of the carboxyl and carbonyl groups on the particle surface were confirmed. The shape and the magnetic properties of the nanoparticles were maintained after the surface modification. Ozonolysis is an effective method in modifying the lyophobic surface of the magnetic nanoparticles.
Collapse
Affiliation(s)
- Sang-Yup Lee
- School of Chemical Engineering, Purdue University, West Lafayette, IN 47907, USA
| | | |
Collapse
|
46
|
Affiliation(s)
- Hsin-Yu Lin
- Department of Chemical and Materials Engineering, Nanocatalysis Research Center, National Central University, Chung-Li 32054, Taiwan
| | - Yu-Wen Chen
- Department of Chemical and Materials Engineering, Nanocatalysis Research Center, National Central University, Chung-Li 32054, Taiwan
| |
Collapse
|
47
|
Effect of Au in V2O5/SiO2 and MoO3/SiO2 catalysts on physicochemical and catalytic properties in oxidation of C3 hydrocarbons and of CO. Catal Today 2005. [DOI: 10.1016/j.cattod.2004.09.035] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
48
|
Daniel MC, Astruc D. Gold nanoparticles: assembly, supramolecular chemistry, quantum-size-related properties, and applications toward biology, catalysis, and nanotechnology. Chem Rev 2004; 104:293-346. [PMID: 14719978 DOI: 10.1021/cr030698+] [Citation(s) in RCA: 7410] [Impact Index Per Article: 370.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Marie-Christine Daniel
- Molecular Nanosciences and Catalysis Group, LCOO, UMR CNRS No. 5802, Université Bordeaux I, 33405 Talence Cedex, France
| | | |
Collapse
|
49
|
Daniel MC, Astruc D. Gold nanoparticles: assembly, supramolecular chemistry, quantum-size-related properties, and applications toward biology, catalysis, and nanotechnology. Chem Rev 2004. [PMID: 14719978 DOI: 10.1021/cr030698%2b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/20/2023]
Affiliation(s)
- Marie-Christine Daniel
- Molecular Nanosciences and Catalysis Group, LCOO, UMR CNRS No. 5802, Université Bordeaux I, 33405 Talence Cedex, France
| | | |
Collapse
|
50
|
Valence band and catalytic activity of Au nanoparticles in Fe2O3/SiO2/Si(100) environment. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2003. [DOI: 10.1016/j.msec.2003.09.075] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|