1
|
Barrow N, Bradley J, Corrie B, Cui Y, Tran TD, Erden TE, Fish A, Garcia M, Glen P, Mistry N, Nicholson M, Roloff-Standring S, Sheldon D, Smith T, Summer A, Din KU, Macleod N. Doubling the life of Cu/ZnO methanol synthesis catalysts via use of Si as a structural promoter to inhibit sintering. SCIENCE ADVANCES 2024; 10:eadk2081. [PMID: 38232167 DOI: 10.1126/sciadv.adk2081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Accepted: 12/19/2023] [Indexed: 01/19/2024]
Abstract
Cu/ZnO/Al2O3 catalysts used to synthesize methanol undergo extensive deactivation during use, mainly due to sintering. Here, we report on formulations wherein deactivation has been substantially reduced by the targeted use of a small quantity of a Si-based promoter, resulting in accrued activity benefits that can exceed a factor of 1.8 versus unpromoted catalysts. This enhanced stability also provides longer lifetimes, up to double that of prior generation catalysts. Detailed characterization of a library of aged catalysts has allowed the most important deactivation mechanisms to be established and the chemical state of the silicon promoter to be identified. We show that silicon is incorporated within the ZnO lattice, providing a pronounced improvement in the hydrothermal stability of this component. These findings have important implications for sustainable methanol production from H2 and CO2.
Collapse
Affiliation(s)
- Nathan Barrow
- Johnson Matthey Technology Centre, Sonning Common, RG4 9NH, UK
| | | | - Benjamin Corrie
- Johnson Matthey, Catalyst Technologies, Billingham, TS23 1LB, UK
| | - Youxin Cui
- Johnson Matthey, Catalyst Technologies, Billingham, TS23 1LB, UK
| | - Trung Dung Tran
- Johnson Matthey Technology Centre, Sonning Common, RG4 9NH, UK
| | | | - Andrew Fish
- Johnson Matthey, Catalyst Technologies, Billingham, TS23 1LB, UK
| | - Monica Garcia
- Johnson Matthey, Catalyst Technologies, Billingham, TS23 1LB, UK
| | - Pauline Glen
- Johnson Matthey, Catalyst Technologies, Billingham, TS23 1LB, UK
| | - Neetisha Mistry
- Johnson Matthey, Catalyst Technologies, Billingham, TS23 1LB, UK
| | | | | | - Daniel Sheldon
- Johnson Matthey, Catalyst Technologies, Billingham, TS23 1LB, UK
| | - Thomas Smith
- Johnson Matthey, Catalyst Technologies, Billingham, TS23 1LB, UK
| | - Aron Summer
- Johnson Matthey Technology Centre, Sonning Common, RG4 9NH, UK
| | - Kaamila Un Din
- Johnson Matthey, Catalyst Technologies, Billingham, TS23 1LB, UK
| | - Norman Macleod
- Johnson Matthey, Catalyst Technologies, Billingham, TS23 1LB, UK
| |
Collapse
|
2
|
Ming HP, Chan CY, Mutalik S, Younas MW, Pragya A, Noor N. Sonochemical Routes to Superhydrophobic Soft Matter Coatings: Comparing Silica and Copper Oxide Coatings on Polyester Fabric. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c02939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Hung Pak Ming
- School of Fashion and Textiles, Materials Synthesis and Processing Lab, The Hong Kong Polytechnic University, Hung Hom, Kowloon999077, Hong Kong SAR
| | - Cheuk Ying Chan
- School of Fashion and Textiles, Materials Synthesis and Processing Lab, The Hong Kong Polytechnic University, Hung Hom, Kowloon999077, Hong Kong SAR
| | - Suhas Mutalik
- School of Fashion and Textiles, Materials Synthesis and Processing Lab, The Hong Kong Polytechnic University, Hung Hom, Kowloon999077, Hong Kong SAR
| | - Muhammad Waseem Younas
- School of Fashion and Textiles, Materials Synthesis and Processing Lab, The Hong Kong Polytechnic University, Hung Hom, Kowloon999077, Hong Kong SAR
| | - Akanksha Pragya
- School of Fashion and Textiles, Materials Synthesis and Processing Lab, The Hong Kong Polytechnic University, Hung Hom, Kowloon999077, Hong Kong SAR
| | - Nuruzzaman Noor
- School of Fashion and Textiles, Materials Synthesis and Processing Lab, The Hong Kong Polytechnic University, Hung Hom, Kowloon999077, Hong Kong SAR
| |
Collapse
|
3
|
Effect of Reaction Time and Hydrothermal Treatment Time on the Textural Properties of SBA-15 Synthesized Using Sodium Silicate as a Silica Source and Its Efficiency for Reducing Tobacco Smoke Toxicity. Catalysts 2021. [DOI: 10.3390/catal11070808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The synthesis of SBA-15 has been optimized using sodium silicate, an inexpensive precursor of SBA-15. In this work, the influence of synthesis times of the precipitation and the hydrothermal treatment steps, on the textural properties developed as well as for reducing the toxic compounds generated in tobacco smoking, has been studied. The hydrothermal treatment has been proved to be necessary to obtain materials with adequate performance in this particular application. Twenty-four hours of hydrothermal treatment provide materials with the best properties. Although the reaction stage usually involves the mixing of reagents during 24 h, 40 min is enough to obtain a material with stick-like morphology and typical textural properties. Moreover, between 1 and 2 h of reaction time, the material proved to have the best performance for the purpose of reducing the toxicity of the products generated during the tobacco smoking process. These results are of great significance for an eventual scaling up to industrial scale of the SBA-15 manufacturing process. Results of a pilot plant experiment in a batch of 4 kg of SBA-15 are reported.
Collapse
|
4
|
Quantum-Sized Zinc Oxide Nanoparticles Synthesised within Mesoporous Silica (SBA-11) by Humid Thermal Decomposition of Zinc Acetate. CRYSTALS 2020. [DOI: 10.3390/cryst10060549] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A modified facile method is presented to synthesise quantum-sized zinc oxide nanoparticles within the pores of a mesoporous silica host (SBA-11). This method eliminates the 3 h alcohol reflux and the basic solution reaction steps of zinc acetate. The mesoporous structure and the ZnO nanoparticles were analysed by X-ray diffractometry, transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, nitrogen sorption analysis and UV–VIS spectroscopy. These tests confirm the synthesis of ~1 nm sized ZnO within the pores of SBA-11 and that the porous structure remained intact after ZnO synthesis.
Collapse
|
5
|
Yang C, Kou J, Fan H, Tian Z, Kong W, Shangguan J. Facile and Versatile Sol-Gel Strategy for the Preparation of a High-Loaded ZnO/SiO 2 Adsorbent for Room-Temperature H 2S Removal. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:7759-7768. [PMID: 31140809 DOI: 10.1021/acs.langmuir.9b00853] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Preparation of well-dispersed ZnO nanograins is necessary to improve their reactivity toward room-temperature H2S removal. However, the challenge to design such a ZnO-based adsorbent with high ZnO loading is yet to be fulfilled. Herein, a facile sol-gel strategy is reported for the preparation of ZnO/SiO2 adsorbents for efficient H2S removal, by innovating a gel-drying method and simultaneously controlling ZnO grain formation through optimizing the molar ratio of ethylene glycol (EG)/nitrates in its precursors. The fabricated adsorbent embedded well-dispersed ZnO nanograins, of approximately 10-15 nm, into a SiO2 matrix (57 wt % ZnO loading) and thus yielded a high H2S removal capacity of 108.9 mg S/g sorbent. Therein, EG was used as a modifier for inhibiting the formation of a denser SiO2 network during the gel drying process and was used as a fuel for promoting the decomposition of nitrates and increasing the surface area of the composites in the subsequent calcination. Modulating the molar ratio of EG/nitrates ≤ 2 in precursors or traditional drying of the gel in an oven should be avoided because these would lead to the oxidation of EG by metallic nitrates and form carboxylate complexes during the gel-drying process. Although the produced ZnO grains had a very small size of less than 5 nm, a layer of monodentate ZnCO3 impurity was formed on the ZnO surface, which will drastically decrease the reactivity of ZnO toward H2S. According to the encouraging results from CuO and Co3O4, this strategy has proved to be versatile for the preparation of other metal oxide/SiO2 adsorbents.
Collapse
Affiliation(s)
| | | | | | - Zhen Tian
- Deparment of Analysis and Service Center , Micromeritics Instrumental Ltd , Shanghai 1071 , China
| | | | | |
Collapse
|
6
|
Aqeel T, Abdullah HN. Direct one-step synthesis of mesoporous ZnO-silicate matrix using a true liquid crystal method. MAIN GROUP CHEMISTRY 2018. [DOI: 10.3233/mgc-180266] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Tariq Aqeel
- Department of Science, College of Basic Education, the Public Authority of Applied Education and Training (PAAET) Kuwait, Safat, Kuwait
| | - Haifaa N. Abdullah
- Department of Laboratories – Applied Chemistry, College of Technological Studies, (PAAET) Kuwait
| |
Collapse
|
7
|
Großmann D, Klementiev K, Sinev I, Grünert W. Surface Alloy or Metal-Cation Interaction-The State of Zn Promoting the Active Cu Sites in Methanol Synthesis Catalysts. ChemCatChem 2016. [DOI: 10.1002/cctc.201601102] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Dennis Großmann
- Lehrstuhl Technische Chemie; Ruhr-Universität Bochum; P.O. Box 102148 44780 Bochum Germany
- Present address: Sasol; Germany, GmbH Paul-Baumann-Str. 1 45772 Marl Germany
| | - Konstantin Klementiev
- Alba Synchrotron; 08290 Cerdanyola del Vallès Barcelona Spain
- Present address: MAX IV Laboratory; Lund University; Lund Sweden
| | - Ilya Sinev
- Lehrstuhl Technische Chemie; Ruhr-Universität Bochum; P.O. Box 102148 44780 Bochum Germany
| | - Wolfgang Grünert
- Lehrstuhl Technische Chemie; Ruhr-Universität Bochum; P.O. Box 102148 44780 Bochum Germany
| |
Collapse
|
8
|
Fei H, Lin Y. Zinc pyridinedicarboxylate micro-nanostructures: Promising anode materials for lithium-ion batteries with excellent cycling performance. J Colloid Interface Sci 2016; 481:256-62. [DOI: 10.1016/j.jcis.2016.07.056] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Revised: 07/19/2016] [Accepted: 07/22/2016] [Indexed: 10/21/2022]
|
9
|
Brown NJ, García-Trenco A, Weiner J, White ER, Allinson M, Chen Y, Wells PP, Gibson EK, Hellgardt K, Shaffer MSP, Williams CK. From Organometallic Zinc and Copper Complexes to Highly Active Colloidal Catalysts for the Conversion of CO2 to Methanol. ACS Catal 2015. [DOI: 10.1021/cs502038y] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Neil J. Brown
- Department
of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, United Kingdom
| | - Andrés García-Trenco
- Department
of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, United Kingdom
| | - Jonathan Weiner
- Department
of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, United Kingdom
| | - Edward R. White
- Department
of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, United Kingdom
| | - Matthew Allinson
- Department
of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, United Kingdom
| | - Yuxin Chen
- Department
of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, United Kingdom
| | - Peter P. Wells
- The UK Catalysis
Hub, Research Complex at Harwell, Harwell, Oxon OX11 0FA, United Kingdom
- Kathleen Lonsdale Building,
Department of Chemistry, University College London, Gordon Street, London WC1H 0AJ, United Kingdom
| | - Emma K. Gibson
- The UK Catalysis
Hub, Research Complex at Harwell, Harwell, Oxon OX11 0FA, United Kingdom
- Kathleen Lonsdale Building,
Department of Chemistry, University College London, Gordon Street, London WC1H 0AJ, United Kingdom
| | - Klaus Hellgardt
- Department
of Chemical Engineering, Imperial College London, South Kensington, London SW7 2AZ, United Kingdom
| | - Milo S. P. Shaffer
- Department
of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, United Kingdom
| | - Charlotte K. Williams
- Department
of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, United Kingdom
| |
Collapse
|
10
|
SBA-15-supported highly dispersed copper catalysts: Vacuum–thermal preparation and catalytic studies in propylene partial oxidation to acrolein. J Catal 2014. [DOI: 10.1016/j.jcat.2014.05.013] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
11
|
Hamdy MS, Amrollahi R, Sinev I, Mei B, Mul G. Strategies to Design Efficient Silica-Supported Photocatalysts for Reduction of CO2. J Am Chem Soc 2013; 136:594-7. [DOI: 10.1021/ja410363v] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Mohamed S. Hamdy
- Photocatalytic
Synthesis Group, Faculty of Science and Technology, MESA+ Institute for Nanotechnology, University of Twente, Enschede, The Netherlands
- Chemistry
Department, Faculty of Science, Helwan University, Cairo, Egypt
| | - Rezvaneh Amrollahi
- Photocatalytic
Synthesis Group, Faculty of Science and Technology, MESA+ Institute for Nanotechnology, University of Twente, Enschede, The Netherlands
| | - Ilya Sinev
- Laboratory
of Industrial Chemistry, Ruhr-University Bochum, 44780 Bochum, Germany
| | - Bastian Mei
- Laboratory
of Industrial Chemistry, Ruhr-University Bochum, 44780 Bochum, Germany
| | - Guido Mul
- Photocatalytic
Synthesis Group, Faculty of Science and Technology, MESA+ Institute for Nanotechnology, University of Twente, Enschede, The Netherlands
| |
Collapse
|
12
|
Qian WJ, Wan MM, Lin WG, Zhu JH. Fabricating a sustained releaser of heparin using SBA-15 mesoporous silica. J Mater Chem B 2013; 2:92-101. [PMID: 32261302 DOI: 10.1039/c3tb21092h] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The sustained release of heparin in sufficient amounts and over long time is a challenge to drive the development of functional materials. In this paper SBA-15 mesoporous silica is selected in the search for a favorable morphology and optimized surface state for the sustained release of heparin. In situ carbonization of the template in the as-synthesized sample enables SBA-15 to possess narrowed channels with rougher surfaces, while modification with (aminopropyl)triethoxysilane (APTES) through a one-pot synthesis offers SBA-15 with positive charges to attract heparin through electro-static interactions. The structure of modified SBA-15 samples is assessed with XRD (powder X-ray diffraction analysis), nitrogen adsorption-desorption and electron microscopy techniques, and their performance is evaluated in adsorption and release of heparin. These modifications improve the heparin adsorption in SBA-15 and thus promote its sustained release, prolonging the release-equilibrium time up to 60 days. Among them, the SBA-15 sample modified with APTES can trap three times as much heparin as the parent SBA-15, and the release ratio is elevated to 80% (that of SBA-15 is 38%), realizing the best performance of controlling heparin release to date.
Collapse
Affiliation(s)
- Wen Juan Qian
- School of Chemistry and Chemical Engineering, Nanjing University, 22 Hankou Road, Nanjing, Jiangsu, China.
| | | | | | | |
Collapse
|
13
|
García-Trenco A, Martínez A. A simple and efficient approach to confine Cu/ZnO methanol synthesis catalysts in the ordered mesoporous SBA-15 silica. Catal Today 2013. [DOI: 10.1016/j.cattod.2013.03.005] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
14
|
Ontam A, Khaorapapong N, Ogawa M. An incorporation of cadmium selenide at organophillic surface of clay mineral. Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2012.06.038] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
15
|
Wan MM, Yang JY, Qiu Y, Zhou Y, Guan CX, Hou Q, Lin WG, Zhu JH. Sustained release of heparin on enlarged-pore and functionalized MCM-41. ACS APPLIED MATERIALS & INTERFACES 2012; 4:4113-22. [PMID: 22850329 DOI: 10.1021/am300878z] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Mesoporous silica MCM-41 and SBA-15 were chosen to study the adsorption and release of bulky biomolecule heparin, in order to develop new heparin controlled delivery system and expand the application of mesoporous materials in life science. To explore how the structure of support such as pore size and surface state affects the accommodation and release of heparin, we used decane as swelling agent to enlarge pores of MCM-41, introduced amino groups for improving the biocompatibility of support, and controllably retained templates in the as-synthesized sample. The influence of modification on the structure of samples was investigated by XRD and N(2) adsorption-desorption, whereas their performance of adsorbing and releasing heparin was assessed with that of toluidine blue method. Both enlarged pore and organic modification significantly promoted the adsorption and prolonged the release of heparin in MCM-41, and the release was characterized with a three-stage release model. The mechanism of heparin release from mesoporous material was studied by fitting the release profiles to the theoretical equation. As expected, some mesoporous composites could release heparin in the long term with tuned dosage.
Collapse
Affiliation(s)
- Mi Mi Wan
- Key Laboratory of Mesoscopic Chemistry of MOE, College of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | | | | | | | | | | | | | | |
Collapse
|
16
|
Deshpande PA, Polisetti S, Madras G, Jyothi D, Chandrasekaran S. Dispersed ZrO2 nanoparticles in MCM-48 with high adsorption activity. AIChE J 2012. [DOI: 10.1002/aic.13719] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
|
17
|
Thielemann JP, Girgsdies F, Schlögl R, Hess C. Pore structure and surface area of silica SBA-15: influence of washing and scale-up. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2011; 2:110-118. [PMID: 21977421 PMCID: PMC3148055 DOI: 10.3762/bjnano.2.13] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2010] [Accepted: 01/12/2011] [Indexed: 05/31/2023]
Abstract
The removal of the surfactant (EO(20)PO(70)EO(20)) by washing before final calcination is a critical step in the synthesis of silica SBA-15. In contrast to washing with pure water or ethanol, washing with water and ethanol may, depending on the quantity of solvent used, alter the homogeneity and order of the pores, but also lead to an increase of the surface area of SBA-15. A reduction of solvent volume and a controlled washing protocol allow the synthesis of high surface area SBA-15 materials with a narrow monomodal pore size distribution. For larger batch sizes the influence of the quantity of solvent on the quality of the SBA-15 is reduced.
Collapse
Affiliation(s)
- Jörg P Thielemann
- Abteilung Anorganische Chemie, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4–6, 14195 Berlin, Germany
- Eduard-Zintl-Institut für Anorganische und Physikalische Chemie, Technische Universität Darmstadt, Petersenstr. 20, 64287 Darmstadt, Germany
| | - Frank Girgsdies
- Abteilung Anorganische Chemie, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4–6, 14195 Berlin, Germany
| | - Robert Schlögl
- Abteilung Anorganische Chemie, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4–6, 14195 Berlin, Germany
| | - Christian Hess
- Eduard-Zintl-Institut für Anorganische und Physikalische Chemie, Technische Universität Darmstadt, Petersenstr. 20, 64287 Darmstadt, Germany
| |
Collapse
|
18
|
Horlait D, Coasne B, Mezy A, Ravot D, Tedenac JC. Molecular simulation of zinc oxide nanostructures confined in carbon nanotubes. MOLECULAR SIMULATION 2010. [DOI: 10.1080/08927022.2010.501798] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
19
|
Marceau E, Che M, Čejka J, Zukal A. Nickel(II) Nitrate vs. Acetate: Influence of the Precursor on the Structure and Reducibility of Ni/MCM-41 and Ni/Al-MCM-41 Catalysts. ChemCatChem 2010. [DOI: 10.1002/cctc.200900289] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
20
|
Coasne B, Mezy A, Pellenq RJM, Ravot D, Tedenac JC. Zinc Oxide Nanostructures Confined in Porous Silicas. J Am Chem Soc 2009; 131:2185-98. [PMID: 19199634 DOI: 10.1021/ja806666n] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Benoit Coasne
- Institut Charles Gerhardt Montpellier, UMR 5253 CNRS, Université Montpellier 2, ENSCM, Place Eugène Bataillon, 34095 Montpellier Cedex 05, France, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77, Massachusetts Avenue, Cambridge, Massachusetts 02139, and Centre Interdisciplinaire des Nanosciences de Marseille, UPR 3118 CNRS, Campus de Luminy, 13288 Marseilles, France
| | - Aude Mezy
- Institut Charles Gerhardt Montpellier, UMR 5253 CNRS, Université Montpellier 2, ENSCM, Place Eugène Bataillon, 34095 Montpellier Cedex 05, France, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77, Massachusetts Avenue, Cambridge, Massachusetts 02139, and Centre Interdisciplinaire des Nanosciences de Marseille, UPR 3118 CNRS, Campus de Luminy, 13288 Marseilles, France
| | - R. J. M. Pellenq
- Institut Charles Gerhardt Montpellier, UMR 5253 CNRS, Université Montpellier 2, ENSCM, Place Eugène Bataillon, 34095 Montpellier Cedex 05, France, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77, Massachusetts Avenue, Cambridge, Massachusetts 02139, and Centre Interdisciplinaire des Nanosciences de Marseille, UPR 3118 CNRS, Campus de Luminy, 13288 Marseilles, France
| | - D. Ravot
- Institut Charles Gerhardt Montpellier, UMR 5253 CNRS, Université Montpellier 2, ENSCM, Place Eugène Bataillon, 34095 Montpellier Cedex 05, France, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77, Massachusetts Avenue, Cambridge, Massachusetts 02139, and Centre Interdisciplinaire des Nanosciences de Marseille, UPR 3118 CNRS, Campus de Luminy, 13288 Marseilles, France
| | - J. C. Tedenac
- Institut Charles Gerhardt Montpellier, UMR 5253 CNRS, Université Montpellier 2, ENSCM, Place Eugène Bataillon, 34095 Montpellier Cedex 05, France, Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77, Massachusetts Avenue, Cambridge, Massachusetts 02139, and Centre Interdisciplinaire des Nanosciences de Marseille, UPR 3118 CNRS, Campus de Luminy, 13288 Marseilles, France
| |
Collapse
|
21
|
van den Berg MWE, Polarz S, Tkachenko OP, Kähler K, Muhler M, Grünert W. Dynamical Changes in the Cu–ZnO x Interaction Observed in a Model Methanol Synthesis Catalyst. Catal Letters 2008. [DOI: 10.1007/s10562-008-9746-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
22
|
Khyzhun OY, Strunskus T, Wöll C, Gies H, Staemmler V. Comparison of the OKα x-ray emission bands in micro- and mesoporous silica materials and in α-quartz. J Chem Phys 2008; 129:084711. [DOI: 10.1063/1.2972145] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
23
|
Tang H, Ren Y, Yue B, Yan S, He H. Cu-incorporated mesoporous materials: Synthesis, characterization and catalytic activity in phenol hydroxylation. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.molcata.2006.07.019] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
24
|
Ramin M, van Vegten N, Grunwaldt JD, Baiker A. Simple preparation routes towards novel Zn-based catalysts for the solventless synthesis of propylene carbonate using dense carbon dioxide. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.molcata.2006.05.041] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
25
|
Schröder F, Hermes S, Parala H, Hikov T, Muhler M, Fischer RA. Non aqueous loading of the mesoporous siliceous MCM-48 matrix with ZnO: a comparison of solution, liquid and gas-phase infiltration using diethyl zinc as organometallic precursor. ACTA ACUST UNITED AC 2006. [DOI: 10.1039/b606814f] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
26
|
Tkachenko OP, Klementiev KV, van den Berg MWE, Gies H, Grünert W. The reduction of copper in porous matrices—the role of electrostatic stabilisation. Phys Chem Chem Phys 2006; 8:1539-49. [PMID: 16633638 DOI: 10.1039/b514744a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The redox properties of Cu(II) species in FAU matrices have been studied by temperature programmed reduction (TPR) in hydrogen and by XAFS analysis of the products obtained after (stationary) reduction treatments at various temperatures. The influence of the matrix polarity was investigated by comparing aluminosilicate FAU (Y zeolite) with siliceous FAU. In addition, the influence of Zn ions on the reduction process was studied. It was found that both the matrix composition and the presence of zinc ions exert a significant influence on the course of the reduction. In Y zeolite, heat treatment which is known to transfer Cu(II) ions to remote sites (SI, SI', SII') affects the reduction process dramatically. Cu(II) is most easily reduced in siliceous FAU, but the reduction proceeds in two clearly separated steps. Between these steps, small Cu(0) nuclei coexist with Cu(I) species, apparently unable to activate hydrogen for the autocatalytic reduction of the remaining Cu ions. The polarity of the matrix causes an upshift of the Cu(II) reduction temperature (in TPR by ca. 80 K for sites in the large cavity, by ca. 105 K for the remote sites), but the reduction of Cu(I) depends strongly on the simultaneous presence of Cu(0) and on its ability to activate hydrogen and induce an autocatalytic reduction mechanism. While Cu(I) species in the large cavities are easily reduced to the metal, tending to segregate from the zeolite lattice, Cu(I) ions in remote sites are strongly stabilized towards further reduction and even traces of Cu metal form only at very high temperatures. In the presence of zinc ions, the Cu metal particles formed were found to be smaller than in zinc-free samples.
Collapse
Affiliation(s)
- O P Tkachenko
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia
| | | | | | | | | |
Collapse
|
27
|
Tkachenko OP, Klementiev KV, van den Berg MWE, Koc N, Bandyopadhyay M, Birkner A, Wöll C, Gies H, Grünert W. Reduction of Copper in Porous Matrixes. Stepwise and Autocatalytic Reduction Routes. J Phys Chem B 2005; 109:20979-88. [PMID: 16853720 DOI: 10.1021/jp054033i] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reduction of Cu(II) oxide species in siliceous matrixes of different porosity (MFI, FAU, MCM-48) and in alumosilicate MFI was studied by temperature-programmed reduction in hydrogen (TPR), by X-ray absorption fine structure (after stationary hydrogen treatments), and by transmission electron microscopy. It was found that the reduction may proceed in one or in two reduction steps. The two-step scheme known for zeolites was observed also for Cu(II) in siliceous microporous matrixes, with similar temperature of Cu(II) reduction onset as for the alumosilicate MFI. Therefore, the two-step scheme cannot be explained by the stabilization of Cu ions by intra-zeolite electrical fields. CuOx clusters in MCM-48 were reduced in a one-step scheme (similar to bulk CuO) at high Cu content (6 wt %) but in a two-step scheme at low Cu content (1 wt %). The two reduction steps observed with most samples cannot be identified with the transitions of all Cu(II) to Cu(I) and of Cu(I) to Cu(0). Instead, Cu(0) nuclei were observed already at low reduction temperatures and were found to coexist with Cu ions over temperature ranges of different extension. This coexistence range was narrow in materials that favor aggregation of the Cu nuclei into particles: Cu-MCM-48 of low Cu content and Cu-ZSM-5. In the latter, metal segregation from the pore system was found to be accompanied by an autocatalytic initiation of the second reduction step. In the siliceous microporous matrixes, the Cu(0) nuclei were observed to coexist with Cu ions over wide temperature ranges (100 K for MFI) at temperatures far above that of Cu reduction in the bulk oxide. These observations suggest that oligomeric Cu metal nuclei which may have been formed, e.g., at the intersections of the MFI channel system, may be unable to activate hydrogen, which would be required for rapid reduction of the coexisting Cu ions.
Collapse
Affiliation(s)
- O P Tkachenko
- Lehrstuhl für Technische Chemie, , Ruhr-Universität Bochum, D-44780 Bochum, Germany
| | | | | | | | | | | | | | | | | |
Collapse
|
28
|
Polarz S, Neues F, van den Berg MWE, Grünert W, Khodeir L. Mesosynthesis of ZnO−Silica Composites for Methanol Nanocatalysis. J Am Chem Soc 2005; 127:12028-34. [PMID: 16117543 DOI: 10.1021/ja0516514] [Citation(s) in RCA: 100] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Methanol catalysis meets chemistry under confined conditions. Methanol is regarded as one of the most important future energy sources. ZnO/Cu composite materials are very effective in heterogeneous catalysis for methanol production due to the so-called strong metal-support interaction effect (SMSI). Therefore, materials of superior structural design potentially representing model systems for heterogeneous catalysis are highly desired. Ultimately, such materials could help to understand the interaction between copper and zinc oxide in more detail than currently possible. We report the preparation of nanocrystalline, size-selected ZnO inside the pore system of ordered mesoporous silica materials. A new, liquid precursor for ZnO is introduced. It is seen that the spatial confinement significantly influences the chemical properties of the precursor as well as determines a hierarchical architecture of the final ZnO/SiO(2) nanocomposites. Finally, the ability of the materials to act as model systems in methanol preparation is investigated. The materials are characterized by a variety of techniques including electron microscopy, X-ray scattering, solid-state NMR, EPR, EXAFS, and Raman spectroscopy, and physisorption analysis.
Collapse
Affiliation(s)
- S Polarz
- Technical University Berlin, Institute of Chemistry, Strasse des 17, Juni 135, 10623 Berlin, Germany.
| | | | | | | | | |
Collapse
|
29
|
Mori K, Mitani Y, Hara T, Mizugaki T, Ebitani K, Kaneda K. A single-site hydroxyapatite-bound zinc catalyst for highly efficient chemical fixation of carbon dioxide with epoxides. Chem Commun (Camb) 2005:3331-3. [PMID: 15983664 DOI: 10.1039/b502636a] [Citation(s) in RCA: 86] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A zinc-based hydroxyapatite catalyst in conjunction with a Lewis base proved to be efficient for the coupling of CO2 and epoxide in the absence of additional organic solvents under an atmospheric CO2 pressure; the work-up procedure is straightforward and the catalyst could be reused without loss of catalytic activity and selectivity.
Collapse
Affiliation(s)
- Kohsuke Mori
- Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan
| | | | | | | | | | | |
Collapse
|
30
|
|