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Filez M, Walke P, Le-The H, Toyouchi S, Peeters W, Tomkins P, Eijkel JCT, De Feyter S, Detavernier C, De Vos DE, Uji-I H, Roeffaers MBJ. Nanoscale Chemical Diversity of Coke Deposits on Nanoprinted Metal Catalysts Visualized by Tip-Enhanced Raman Spectroscopy. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2305984. [PMID: 37938141 DOI: 10.1002/adma.202305984] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 10/31/2023] [Indexed: 11/09/2023]
Abstract
Coke formation is the prime cause of catalyst deactivation, where undesired carbon wastes block the catalyst surface and hinder further reaction in a broad gamut of industrial chemical processes. Yet, the origins of coke formation and their distribution across the catalyst remain elusive, obstructing the design of coke-resistant catalysts. Here, the first-time application of tip-enhanced Raman spectroscopy (TERS) is demonstrated as a nanoscale chemical probe to localize and identify coke deposits on a post-mortem metal nanocatalyst. Monitoring coke at the nanoscale circumvents bulk averaging and reveals the local nature of coke with unmatched detail. The nature of coke is chemically diverse and ranges from nanocrystalline graphite to disordered and polymeric coke, even on a single nanoscale location of a top-down nanoprinted SiO2 -supported Pt catalyst. Surprisingly, not all Pt is an equal producer of coke, where clear isolated coke "hotspots" are present non-homogeneously on Pt which generate large amounts of disordered coke. After their formation, coke shifts to the support and undergoes long-range transport on the surrounding SiO2 surface, where it becomes more graphitic. The presented results provide novel guidelines to selectively free-up the coked metal surface at more mild rejuvenation conditions, thus securing the long-term catalyst stability.
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Affiliation(s)
- Matthias Filez
- Centre for Membrane Separations, Adsorption, Catalysis and Spectroscopy for Sustainable Solutions (cMACS), KU Leuven, Celestijnenlaan 200F, Leuven, 3001, Belgium
- Conformal Coating of Nanomaterials (CoCooN), Department of Solid State Sciences, Ghent University, Krijgslaan 281/S1, Ghent, 9000, Belgium
| | - Peter Walke
- Division of Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200F, Leuven, 3001, Belgium
| | - Hai Le-The
- BIOS Lab-on-a-Chip Group, MESA+ Institute, University of Twente, Enschede, NB, 7522, The Netherlands
| | - Shuichi Toyouchi
- Division of Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200F, Leuven, 3001, Belgium
| | - Wannes Peeters
- Division of Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200F, Leuven, 3001, Belgium
| | - Patrick Tomkins
- Centre for Membrane Separations, Adsorption, Catalysis and Spectroscopy for Sustainable Solutions (cMACS), KU Leuven, Celestijnenlaan 200F, Leuven, 3001, Belgium
| | - Jan C T Eijkel
- BIOS Lab-on-a-Chip Group, MESA+ Institute, University of Twente, Enschede, NB, 7522, The Netherlands
| | - Steven De Feyter
- Division of Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200F, Leuven, 3001, Belgium
| | - Christophe Detavernier
- Conformal Coating of Nanomaterials (CoCooN), Department of Solid State Sciences, Ghent University, Krijgslaan 281/S1, Ghent, 9000, Belgium
| | - Dirk E De Vos
- Centre for Membrane Separations, Adsorption, Catalysis and Spectroscopy for Sustainable Solutions (cMACS), KU Leuven, Celestijnenlaan 200F, Leuven, 3001, Belgium
| | - Hiroshi Uji-I
- Division of Molecular Imaging and Photonics, Department of Chemistry, KU Leuven, Celestijnenlaan 200F, Leuven, 3001, Belgium
- Research Institute for Electronic Science (RIES), Hokkaido University, Sapporo, Hokkaido, 001-0020, Japan
- Division of Information Science and Technology, Graduate School of Information Science and Technology, Hokkaido University, Sapporo, Hokkaido, 060-0814, Japan
| | - Maarten B J Roeffaers
- Centre for Membrane Separations, Adsorption, Catalysis and Spectroscopy for Sustainable Solutions (cMACS), KU Leuven, Celestijnenlaan 200F, Leuven, 3001, Belgium
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2
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Ul Huda N, Ul-Hamid A, Khan MA, Shahida S, Zaheer M. Mesoporous Silica (MCM-41) Containing Dispersed Palladium Nanoparticles as Catalyst for Dehydrogenation, Methanolysis, and Reduction Reactions. Chempluschem 2023; 88:e202300338. [PMID: 37736704 DOI: 10.1002/cplu.202300338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Revised: 09/14/2023] [Accepted: 09/21/2023] [Indexed: 09/23/2023]
Abstract
Generating highly dispersed metal NPs of the desired size on surfaces such as porous silica is challenging due to wettability issues. Here, we report highly active and well-dispersed Pd incorporated mesoporous MCM-41 (Pd@MCM) using a facile impregnation via a molecular approach based on hydrogen bonding interaction of a palladium β-diketone complex with surface silanol groups of mesoporous silica. Controlled thermal treatment of so obtained materials in air, argon, and hydrogen provided the catalysts characterized by electron microscopy, nitrogen physisorption, X-ray diffraction and spectroscopy. Gratifyingly, our catalyst provided the lowest ever activation energy (14.3 kJ/mol) reported in literature for dehydrogenation of NaBH4 . Moreover, the rate constant (7×10-3 s-1 ) for the reduction of 4-nitrophenol outperformed the activity of commercial Pd/C (4×10-3 s-1 ) and Pd/Al2 O3 (5×10-3 s-1 ) catalysts.
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Affiliation(s)
- Noor Ul Huda
- Department of chemistry and Chemical Engineering, Syed Babar Ali School of Science and Engineering, Lahore University of Management Sciences (LUMS), Sector U, DHA, Lahore, 54792, Pakistan
| | - Anwar Ul-Hamid
- Core Research Facilities, King Fahd University of Petroleum and Mineral, Dhahran, 31261, Saudi Arabia
| | - Muhammad Abdullah Khan
- Renewable Energy Advancement Laboratory, Department of Environmental Sciences, Quaid-i-Azam University, Islamabad, Pakistan
| | - Shabnam Shahida
- Department of Chemistry, University of Poonch Rawalakot Azad Jammu and Kashmir, Rawalakot, Pakistan
| | - Muhammad Zaheer
- Department of chemistry and Chemical Engineering, Syed Babar Ali School of Science and Engineering, Lahore University of Management Sciences (LUMS), Sector U, DHA, Lahore, 54792, Pakistan
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3
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Li P, Fu X, Zhou Q, Fu X, Wang A, Zhang G, Jiao W, Wang C. Mechanistic understanding and the rational design of a SiO 2@CD catalyst for selective protection of L-lysine. Org Biomol Chem 2023; 21:551-563. [PMID: 36537901 DOI: 10.1039/d2ob01535h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The mechanism of the selective protection of L-lysine mediated by β-cyclodextrin (β-CD) was investigated by preliminary experiments, including the reaction efficiency influenced by different reaction conditions, and the existence of (1a·CD)' and 1a·CD·2a was evidenced by ESI-MS and 2D Rotating Frame Overhauser Effect Spectroscopy (ROESY) analysis. The results indicated that the formation of (1a·CD)' is critical for the product selectivity and the further formation of the ternary complex 1·CD·2 is responsible for the reaction efficiency. Thus, the yields and selectivity were significantly influenced by the structure, size and reactivity of the reactants. During the mechanistic investigations, we realized that the formation of the product and the β-CD complex at the final stage of the reaction would cause difficulty in product purification by a previously reported homogeneous method. In light of this understanding, an efficient and practical protocol for selective protection of L-lys based on a heterogeneous catalyst SiO2@CD was developed. The use of the SiO2 immobilized β-CD catalyst prevented the formation of the "capped" products by controlling the spatial rearrangement of β-CDs on solid supports, which represents a considerable synthetic improvement over the tedious and wasteful organic solvent extraction for product purification.
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Affiliation(s)
- Pinyi Li
- Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China. .,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xue Fu
- Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China. .,College of Architecture and Environment, Sichuan university, Chengdu 610065, China
| | - Qiang Zhou
- Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China.
| | - Xuewen Fu
- Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China.
| | - An Wang
- College of Architecture and Environment, Sichuan university, Chengdu 610065, China
| | - Guolin Zhang
- Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China.
| | - Wei Jiao
- Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China.
| | - Chun Wang
- Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China.
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4
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Xie W, Zhang G, Guo Z, Huang H, Ye J, Gao X, Yue K, Wei Y, Zhao L. Shape-controllable and kinetically miscible Copper-Palladium bimetallic nanozymes with enhanced Fenton-like performance for biocatalysis. Mater Today Bio 2022; 16:100411. [PMID: 36186845 PMCID: PMC9520275 DOI: 10.1016/j.mtbio.2022.100411] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Revised: 08/23/2022] [Accepted: 08/24/2022] [Indexed: 12/03/2022] Open
Abstract
Bimetallic nanozymes have been emerging as essential catalysts due to their unique physicochemical properties from the monometallics. However, the access to optimize catalytic performance is often limited by the thermodynamic immiscibility and also heterogeneity. Thus, we present a one-step coreduction strategy to prepare the miscible Cu-Pd bimetallic nanozymes with controllable shape and homogeneously alloyed structure. The homogeneity is systematically explored and luckily, the homogeneous introduction of Cu successfully endows Cu-Pd bimetallic nanozymes with enhanced Fenton-like efficiency. Density functional theory (DFT) theoretical calculation reveals that Cu-Pd bimetallic nanozymes exhibit smaller d-band center compared with Pd nanozymes. Easier adsorption of H2O2 molecular contributed by the electronic structure of Cu significantly accelerate the catalytic process together with the strong repulsive interaction between H atom and Pd atom. In vitro cytotoxicity and intracellular ROS generation performance reveal the potential for in vivo biocatalysis. The strategy to construct kinetically miscible Cu-Pd bimetallic nanozymes will guide the development of bimetallic catalysts with excellent Fenton-like efficiency for biocatalytic nanomedicine.
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Affiliation(s)
- Wensheng Xie
- The Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, PR China
| | - Genpei Zhang
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, PR China
- Shunde Graduate School of University of Science and Technology Beijing, Shunde, Guangdong Province, 528399, PR China
| | - Zhenhu Guo
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, PR China
| | - Hongye Huang
- The Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, PR China
| | - Jielin Ye
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, PR China
| | - Xiaohan Gao
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, PR China
| | - Kai Yue
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, PR China
- Shunde Graduate School of University of Science and Technology Beijing, Shunde, Guangdong Province, 528399, PR China
| | - Yen Wei
- The Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, PR China
| | - Lingyun Zhao
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, PR China
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5
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Sharma AK, Mehara P, Das P. Recent Advances in Supported Bimetallic Pd–Au Catalysts: Development and Applications in Organic Synthesis with Focused Catalytic Action Study. ACS Catal 2022. [DOI: 10.1021/acscatal.2c00725] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ajay Kumar Sharma
- Chemical Technology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh 176061, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Pushkar Mehara
- Chemical Technology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh 176061, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Pralay Das
- Chemical Technology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, Himachal Pradesh 176061, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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6
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Qu J, Yang W, Wu T, Ren W, Huang J, Yu H, Zhao C, Griffith MJ, Zheng R, Ringer SP, Cairney JM. Atom probe specimen preparation methods for nanoparticles. Ultramicroscopy 2022; 233:113420. [PMID: 34775241 DOI: 10.1016/j.ultramic.2021.113420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 10/26/2021] [Accepted: 10/31/2021] [Indexed: 11/17/2022]
Abstract
Revealing the position of materials with chemical selectivity at atomic scale within functional nanoparticles is essential to understand and control their performance and cutting-edge atom probe tomography is a powerful tool to undertake this task. In this paper, we demonstrate three effective methods to prepare the needle-shaped specimens required for atom probe tomography measurements from nanoparticles of different sizes and provide examples of how atom probe can be used to provide data that is critical to their functionality. Samples measured include lithium-ion batteries (LIBs) cathode nanoparticles (300 - 500 nm), nickel-doped silicon dioxide (Ni@SiO2) catalytic nanoparticles (100 - 200 nm) and tin-doped copper (Sn@Cu) catalytic nanoparticles (<100 nm). The methods presented can be used to address the ongoing challenge of specimen preparation from particle samples for atom probe measurement, and they provide high quality data. These methods will broaden the application of atom probe tomography and will provide alternative option for researchers to assess the performance/structure of their functional nanomaterials.
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Affiliation(s)
- Jiangtao Qu
- Australian Centre for Microscopy & Microanalysis
| | - Wenjie Yang
- School of Chemical and Biomolecular Engineering
| | - Tianhao Wu
- Key Laboratory of Advanced Functional Materials, Beijing University of Technology, Beijing 100124 China
| | - Wenhao Ren
- School of Chemistry, University of New South Wales, 2052 NSW, Australia
| | - Jun Huang
- School of Chemical and Biomolecular Engineering
| | - Haijun Yu
- Key Laboratory of Advanced Functional Materials, Beijing University of Technology, Beijing 100124 China
| | - Chuan Zhao
- School of Chemistry, University of New South Wales, 2052 NSW, Australia
| | | | - Rongkun Zheng
- Australian Centre for Microscopy & Microanalysis; the School of Physics
| | - Simon P Ringer
- Australian Centre for Microscopy & Microanalysis; School of Aerospace, Mechanical and Mechatronic Engineering, the University of Sydney, 2006, Australia
| | - Julie M Cairney
- Australian Centre for Microscopy & Microanalysis; School of Aerospace, Mechanical and Mechatronic Engineering, the University of Sydney, 2006, Australia.
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7
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Goodman ED, Asundi AS, Hoffman AS, Bustillo KC, Stebbins JF, Bare SR, Bent SF, Cargnello M. Monolayer Support Control and Precise Colloidal Nanocrystals Demonstrate Metal-Support Interactions in Heterogeneous Catalysts. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2104533. [PMID: 34535919 DOI: 10.1002/adma.202104533] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2021] [Revised: 07/22/2021] [Indexed: 06/13/2023]
Abstract
Electronic and geometric interactions between active and support phases are critical in determining the activity of heterogeneous catalysts, but metal-support interactions are challenging to study. Here, it is demonstrated how the combination of the monolayer-controlled formation using atomic layer deposition (ALD) and colloidal nanocrystal synthesis methods leads to catalysts with sub-nanometer precision of active and support phases, thus allowing for the study of the metal-support interactions in detail. The use of this approach in developing a fundamental understanding of support effects in Pd-catalyzed methane combustion is demonstrated. Uniform Pd nanocrystals are deposited onto Al2 O3 /SiO2 spherical supports prepared with control over morphology and Al2 O3 layer thicknesses ranging from sub-monolayer to a ≈4 nm thick uniform coating. Dramatic changes in catalytic activity depending on the coverage and structure of Al2 O3 situated at the Pd/Al2 O3 interface are observed, with even a single monolayer of alumina contributing an order of magnitude increase in reaction rate. By building the Pd/Al2 O3 interface up layer-by-layer and using uniform Pd nanocrystals, this work demonstrates the importance of controlled and tunable materials in determining metal-support interactions and catalyst activity.
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Affiliation(s)
- Emmett D Goodman
- Department of Chemical Engineering, Stanford University, Stanford, CA, 94305, USA
| | - Arun S Asundi
- Department of Chemical Engineering, Stanford University, Stanford, CA, 94305, USA
| | - Adam S Hoffman
- SSRL, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
| | - Karen C Bustillo
- National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - Jonathan F Stebbins
- Department of Geological Sciences, Stanford University, Stanford, CA, 94305, USA
| | - Simon R Bare
- SSRL, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
| | - Stacey F Bent
- Department of Chemical Engineering, Stanford University, Stanford, CA, 94305, USA
| | - Matteo Cargnello
- Department of Chemical Engineering, Stanford University, Stanford, CA, 94305, USA
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8
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Serna P, Rodríguez-Fernández A, Yacob S, Kliewer C, Moliner M, Corma A. Single-Site vs. Cluster Catalysis in High Temperature Oxidations. Angew Chem Int Ed Engl 2021; 60:15954-15962. [PMID: 33881798 DOI: 10.1002/anie.202102339] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 04/07/2021] [Indexed: 12/28/2022]
Abstract
The behavior of single Pt atoms and small Pt clusters was investigated for high-temperature oxidations. The high stability of these molecular sites in CHA is a key to intrinsic structure-performance descriptions of elemental steps such as O2 dissociation, and subsequent oxidation catalysis. Subtle changes in the atomic structure of Pt are responsible for drastic changes in performance driven by specific gas/metal/support interactions. Whereas single Pt atoms and Pt clusters (> ca. 1 nm) are unable to activate, scramble, and desorb two O2 molecules at moderate T (200 °C), clusters <1 nm do so catalytically, but undergo oxidative fragmentation. Oxidation of alkanes at high T is attributed to stable single Pt atoms, and the C-H cleavage is inferred to be rate-determining and less sensitive to changes in metal nuclearity compared to its effect on O2 scrambling. In contrast, when combustion involves CO, catalysis is dominated by metal clusters, not single Pt atoms.
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Affiliation(s)
- Pedro Serna
- ExxonMobil Research and Engineering Co., Corporate Strategic Research, Annandale, NJ, 08801, USA
| | - Aida Rodríguez-Fernández
- Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Cientificas (UPV-CSIC), Av. de los Naranjos, s/n, 46022, Valencia, Spain
| | - Sara Yacob
- ExxonMobil Research and Engineering Co., Corporate Strategic Research, Annandale, NJ, 08801, USA
| | - Christine Kliewer
- ExxonMobil Research and Engineering Co., Corporate Strategic Research, Annandale, NJ, 08801, USA
| | - Manuel Moliner
- Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Cientificas (UPV-CSIC), Av. de los Naranjos, s/n, 46022, Valencia, Spain
| | - Avelino Corma
- Instituto de Tecnología Química, Universitat Politècnica de València-Consejo Superior de Investigaciones Cientificas (UPV-CSIC), Av. de los Naranjos, s/n, 46022, Valencia, Spain
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9
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Serna P, Rodríguez‐Fernández A, Yacob S, Kliewer C, Moliner M, Corma A. Single‐Site vs. Cluster Catalysis in High Temperature Oxidations. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202102339] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Pedro Serna
- ExxonMobil Research and Engineering Co. Corporate Strategic Research Annandale NJ 08801 USA
| | - Aida Rodríguez‐Fernández
- Instituto de Tecnología Química, Universitat Politècnica de València—Consejo Superior de Investigaciones Cientificas (UPV-CSIC) Av. de los Naranjos, s/n 46022 Valencia Spain
| | - Sara Yacob
- ExxonMobil Research and Engineering Co. Corporate Strategic Research Annandale NJ 08801 USA
| | - Christine Kliewer
- ExxonMobil Research and Engineering Co. Corporate Strategic Research Annandale NJ 08801 USA
| | - Manuel Moliner
- Instituto de Tecnología Química, Universitat Politècnica de València—Consejo Superior de Investigaciones Cientificas (UPV-CSIC) Av. de los Naranjos, s/n 46022 Valencia Spain
| | - Avelino Corma
- Instituto de Tecnología Química, Universitat Politècnica de València—Consejo Superior de Investigaciones Cientificas (UPV-CSIC) Av. de los Naranjos, s/n 46022 Valencia Spain
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10
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Goodman ED, Carlson EZ, Dietze EM, Tahsini N, Johnson A, Aitbekova A, Nguyen Taylor T, Plessow PN, Cargnello M. Size-controlled nanocrystals reveal spatial dependence and severity of nanoparticle coalescence and Ostwald ripening in sintering phenomena. NANOSCALE 2021; 13:930-938. [PMID: 33367382 DOI: 10.1039/d0nr07960j] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
A major aim in the synthesis of nanomaterials is the development of stable materials for high-temperature applications. Although the thermal coarsening of small and active nanocrystals into less active aggregates is universal in material deactivation, the atomic mechanisms governing nanocrystal growth remain elusive. By utilizing colloidally synthesized Pd/SiO2 powder nanocomposites with controlled nanocrystal sizes and spatial arrangements, we unravel the competing contributions of particle coalescence and atomic ripening processes in nanocrystal growth. Through the study of size-controlled nanocrystals, we can uniquely identify the presence of either nanocrystal dimers or smaller nanoclusters, which indicate the relative contributions of these two processes. By controlling and tracking the nanocrystal density, we demonstrate the spatial dependence of nanocrystal coalescence and the spatial independence of Ostwald (atomic) ripening. Overall, we prove that the most significant loss of the nanocrystal surface area is due to high-temperature atomic ripening. This observation is in quantitative agreement with changes in the nanocrystal density produced by simulations of atomic exchange. Using well-defined colloidal materials, we extend our analysis to explain the unusual high-temperature stability of Au/SiO2 materials up to 800 °C.
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Affiliation(s)
- Emmett D Goodman
- Department of Chemical Engineering and SUNCAT Center for Interface Science and Catalysis, Stanford University, Stanford, CA 94305, USA.
| | - Evan Z Carlson
- Department of Chemical Engineering and SUNCAT Center for Interface Science and Catalysis, Stanford University, Stanford, CA 94305, USA.
| | - Elisabeth M Dietze
- Institute of Catalysis Research and Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Nadia Tahsini
- Department of Chemical Engineering and SUNCAT Center for Interface Science and Catalysis, Stanford University, Stanford, CA 94305, USA.
| | - Arun Johnson
- Department of Chemical Engineering and SUNCAT Center for Interface Science and Catalysis, Stanford University, Stanford, CA 94305, USA.
| | - Aisulu Aitbekova
- Department of Chemical Engineering and SUNCAT Center for Interface Science and Catalysis, Stanford University, Stanford, CA 94305, USA.
| | - Temy Nguyen Taylor
- Department of Chemical Engineering and SUNCAT Center for Interface Science and Catalysis, Stanford University, Stanford, CA 94305, USA.
| | - Philipp N Plessow
- Institute of Catalysis Research and Technology, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Matteo Cargnello
- Department of Chemical Engineering and SUNCAT Center for Interface Science and Catalysis, Stanford University, Stanford, CA 94305, USA.
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11
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Pramanik A, Bhar S. Silica–sulfuric acid and alumina–sulfuric acid: versatile supported Brønsted acid catalysts. NEW J CHEM 2021. [DOI: 10.1039/d1nj02887a] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
–SO3H functionalized silica and alumina have emerged as efficient and eco-compatible heterogeneous solid acid catalysts for the construction of various important molecular skeletons.
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Affiliation(s)
- Amit Pramanik
- Department of Chemistry, A.B.N. Seal College, Cooch Behar, PIN-736 101, India
| | - Sanjay Bhar
- Department of Chemistry, Jadavpur University, Kolkata, PIN-700 032, India
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12
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Norouzi N, Das MK, Richard AJ, Ibrahim AA, El-Kaderi HM, El-Shall MS. Heterogeneous catalysis by ultra-small bimetallic nanoparticles surpassing homogeneous catalysis for carbon-carbon bond forming reactions. NANOSCALE 2020; 12:19191-19202. [PMID: 32926030 DOI: 10.1039/d0nr04105j] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Palladium catalyzed cross-coupling reactions represent a significant advancement in contemporary organic synthesis as these reactions are of strategic importance in the area of pharmaceutical drug discovery and development. Supported palladium-based catalysts are highly sought-after in carbon-carbon bond forming catalytic processes to ensure catalyst recovery and reuse while preventing product contamination. This paper reports the development of heterogeneous Pd-based bimetallic catalysts supported on fumed silica that have high activity and selectivity matching those of homogeneous catalysts, eliminating the catalyst's leaching and sintering and allowing efficient recycling of the catalysts. Palladium and base metal (Cu, Ni or Co) contents of less than 1.0 wt% loading are deposited on a mesoporous fumed silica support (surface area SABET = 350 m2 g-1) using strong electrostatic adsorption (SEA) yielding homogeneously alloyed nanoparticles with an average size of 1.3 nm. All bimetallic catalysts were found to be highly active toward Suzuki cross-coupling (SCC) reactions with superior activity and stability for the CuPd/SiO2 catalyst. A low CuPd/SiO2 loading (Pd: 0.3 mol%) completes the conversion of bromobenzene and phenylboronic acid to biphenyl in 30 minutes under ambient conditions in water/ethanol solvent. In contrast, monometallic Pd/SiO2 (Pd: 0.3 mol%) completes the same reaction in three hours under the same conditions. The combination of Pd with the base metals helps in retaining the Pd0 status by charge donation from the base metals to Pd, thus lowering the activation energy of the aryl halide oxidative addition step. Along with its exceptional activity, CuPd/SiO2 exhibits excellent recycling performance with a turnover frequency (TOF) of 280 000 h-1 under microwave reaction conditions at 60 °C. Our study demonstrates that SEA is an excellent synthetic strategy for depositing ultra-small Pd-based bimetallic nanoparticles on porous silica for SCC. This avenue not only provides highly active and sintering-resistant catalysts but also significantly lowers Pd contents in the catalysts without compromising catalytic activity, making the catalysts very practical for large-scale applications.
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Affiliation(s)
- Nazgol Norouzi
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284-2006, USA.
| | - Mrinmoy K Das
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284-2006, USA.
| | - Alexander J Richard
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284-2006, USA.
| | - Amr A Ibrahim
- Department of Chemistry, Faculty of Science, Mansoura University, Al-Mansoura 35516, Egypt
| | - Hani M El-Kaderi
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284-2006, USA.
| | - M Samy El-Shall
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284-2006, USA.
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13
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Sharma J, Polizos G. Hollow Silica Particles: Recent Progress and Future Perspectives. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E1599. [PMID: 32823994 PMCID: PMC7466709 DOI: 10.3390/nano10081599] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Revised: 08/11/2020] [Accepted: 08/12/2020] [Indexed: 01/17/2023]
Abstract
Hollow silica particles (or mesoporous hollow silica particles) are sought after for applications across several fields, including drug delivery, battery anodes, catalysis, thermal insulation, and functional coatings. Significant progress has been made in hollow silica particle synthesis and several new methods are being explored to use these particles in real-world applications. This review article presents a brief and critical discussion of synthesis strategies, characterization techniques, and current and possible future applications of these particles.
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Affiliation(s)
- Jaswinder Sharma
- Roll-to-Roll Manufacturing Group, Energy and Transportation Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
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14
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Singh RK, Sharda S, Sharma S, Kumar S, Prasad DN. Multicomponent Catalytic Synthesis of 1,5-Benzodiazepines: An Update. MINI-REV ORG CHEM 2020. [DOI: 10.2174/1570193x16666190509074109] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
1,5-Benzodiazepines are considered some of the most vital classes of heterocyclic compounds due to their amazing biological and varied pharmacological activities. They are regarded as privileged structures and therefore have been striking synthetic targets for organic and medicinal chemists over the last decade. This results in the exploration of various silica supported catalysts, Lewis acids, organoacids, magnetic nanoparticles and other miscellaneous catalysts that have been investigated till date for an efficient and green synthesis of 1,5-benzodiazepine and its derivatives. The current review article primarily covers the one-pot green chemical synthesis of 1,5- benzodiazepines using various novel catalysts. The main motive of this review is the assessment of the literature on various catalysts along with their yield, reaction condition, and mechanism of action. In the end, the entire catalysts are structured systematically into various Lewis acids, Bronsted organoacids, supported catalysts, nanocatalysts, and miscellaneous catalysts and are presented in the form of tables for quick ‘at a glance’ study of catalysts, their reaction condition, time taken, etc.
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Affiliation(s)
- Rajesh K. Singh
- Department of Pharmaceutical Chemistry, Shivalik College of Pharmacy, Nangal, Dist. Rupnagar, 140126, Punjab, India
| | - Sadhna Sharda
- Department of Pharmaceutical Chemistry, Lovely Professional University, Phagwara, 144411, Punjab, India
| | - Shikha Sharma
- Department of Pharmaceutical Chemistry, Global College of Pharmacy, Kahnpur-Khui, Dist. Ropar, Punjab, India
| | - Sahil Kumar
- Department of Pharmacy, School of Medical and Allied Sciences, GD Goenka University, Sohna, Dist. Gurugram- 122103, Haryana, India
| | - Deo Nandan Prasad
- Department of Pharmaceutical Chemistry, Shivalik College of Pharmacy, Nangal, Dist. Rupnagar, 140126, Punjab, India
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15
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Singh RK, Dhiman A, Chaudhary S, Prasad DN, Kumar S. Current Progress in the Multicomponent Catalytic Synthesis of Amidoalkyl- Naphthols: An Update. CURR ORG CHEM 2020. [DOI: 10.2174/1385272822666200217100344] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Amidoalkyl-2-naphthol is one of the vital synthetic intermediates which occupy
an imperative position in medicinal chemistry due to its amazing biological, pharmacological
as well as industrial and synthetic applications. Owing to its diverse pharmaceutical
activities, hundreds of scientific literature are available, signifying the efficient synthesis
of this intermediate using various catalysts. Most of these literature methods suffer from
low yield and harsh reaction conditions that further ignited the researcher to explore for
another green catalyst and fresh methodologies. This review summarizes the last five
years progress in the catalytic synthesis of 1-amidoalkyl-2-naphthols using various heterogenous,
homogenous and nanocatalysts along with their mechanism of action. Various
advantages like green synthesis, atom economy, clean reaction profile and catalyst recovery
are discussed which facilitate the scientist to probe and stimulate the study on this scaffold. In the end, the
catalysts and reactions condition are organized into the tables for swift at a glance understanding of different
catalysts used with their yield and time taken for the synthesis.
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Affiliation(s)
- Rajesh K. Singh
- Department of Pharmaceutical Chemistry, Shivalik College of Pharmacy, Nangal, District Rupnagar, 140126, Punjab, India
| | - Ashima Dhiman
- Department of Pharmaceutical Chemistry, Shivalik College of Pharmacy, Nangal, District Rupnagar, 140126, Punjab, India
| | - Shallu Chaudhary
- Department of Pharmaceutical Chemistry, Shivalik College of Pharmacy, Nangal, District Rupnagar, 140126, Punjab, India
| | - Deo Nandan Prasad
- Department of Pharmaceutical Chemistry, Shivalik College of Pharmacy, Nangal, District Rupnagar, 140126, Punjab, India
| | - Sahil Kumar
- Department of Pharmacy, School of Medical and Allied Sciences, GD Goenka University, Sohna, District Gurugram-122103, Haryana, Faridabad, India
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16
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Hu Y, Jensen JO, Cleemann LN, Brandes BA, Li Q. Synthesis of Pt–Rare Earth Metal Nanoalloys. J Am Chem Soc 2019; 142:953-961. [DOI: 10.1021/jacs.9b10813] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yang Hu
- Department of Energy Conversion and Storage, Technical University of Denmark, Fysikvej, Building 310, DK-2800 Kgs. Lyngby, Denmark
| | - Jens Oluf Jensen
- Department of Energy Conversion and Storage, Technical University of Denmark, Fysikvej, Building 310, DK-2800 Kgs. Lyngby, Denmark
| | - Lars Nilausen Cleemann
- Department of Energy Conversion and Storage, Technical University of Denmark, Fysikvej, Building 310, DK-2800 Kgs. Lyngby, Denmark
| | - Benedikt Axel Brandes
- Department of Energy Conversion and Storage, Technical University of Denmark, Fysikvej, Building 310, DK-2800 Kgs. Lyngby, Denmark
| | - Qingfeng Li
- Department of Energy Conversion and Storage, Technical University of Denmark, Fysikvej, Building 310, DK-2800 Kgs. Lyngby, Denmark
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17
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Palermo AP, Schöttle C, Zhang S, Grosso-Giordano NA, Okrut A, Dixon DA, Frei H, Gates BC, Katz A. Spectroscopic Characterization of μ-η1:η1-Peroxo Ligands Formed by Reaction of Dioxygen with Electron-Rich Iridium Clusters. Inorg Chem 2019; 58:14338-14348. [DOI: 10.1021/acs.inorgchem.9b01529] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Andrew P. Palermo
- Department of Chemical Engineering, University of California at Davis, One Shields Avenue, Davis, California 95616, United States
| | - Christian Schöttle
- Department of Chemical and Biomolecular Engineering, University of California at Berkeley, Berkeley, California 94720-1462, United States
| | - Shengjie Zhang
- Department of Chemistry and Biochemistry, The University of Alabama, Tuscaloosa, Alabama 35487, United States
| | - Nicolás A. Grosso-Giordano
- Department of Chemical and Biomolecular Engineering, University of California at Berkeley, Berkeley, California 94720-1462, United States
| | - Alexander Okrut
- Department of Chemical and Biomolecular Engineering, University of California at Berkeley, Berkeley, California 94720-1462, United States
| | - David A. Dixon
- Department of Chemistry and Biochemistry, The University of Alabama, Tuscaloosa, Alabama 35487, United States
| | - Heinz Frei
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, University of California at Berkeley, Berkeley, California 94720, United States
| | - Bruce C. Gates
- Department of Chemical Engineering, University of California at Davis, One Shields Avenue, Davis, California 95616, United States
| | - Alexander Katz
- Department of Chemical and Biomolecular Engineering, University of California at Berkeley, Berkeley, California 94720-1462, United States
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18
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Meng J, Chang F, Su Y, Liu R, Cheng T, Liu G. Switchable Catalysts Used To Control Suzuki Cross-Coupling and Aza–Michael Addition/Asymmetric Transfer Hydrogenation Cascade Reactions. ACS Catal 2019. [DOI: 10.1021/acscatal.9b01593] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Jingjing Meng
- Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, People’s Republic of China
| | - Fengwei Chang
- Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, People’s Republic of China
| | - Yanchao Su
- Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, People’s Republic of China
| | - Rui Liu
- Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, People’s Republic of China
| | - Tanyu Cheng
- Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, People’s Republic of China
| | - Guohua Liu
- Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, People’s Republic of China
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19
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Integrated soluble polymer and mesoporous silica as a double–type support to immobilize tertiary amine–Ru/diamine–bifunctionality for aza–addition/reduction cascade reaction. J Catal 2019. [DOI: 10.1016/j.jcat.2019.07.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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20
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Liu Z, Li J, Buettner M, Ranganathan RV, Uddi M, Wang R. Metal-Support Interactions in CeO 2- and SiO 2-Supported Cobalt Catalysts: Effect of Support Morphology, Reducibility, and Interfacial Configuration. ACS APPLIED MATERIALS & INTERFACES 2019; 11:17035-17049. [PMID: 30977630 DOI: 10.1021/acsami.9b02455] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
With the increasing demand for highly efficient and durable catalysts, researchers have been doing extensive research to engineer the shape, size, and even phase (e.g., hcp or fcc Co) of individual catalyst nanoparticles, as well as the interface structure between the catalyst and support. In this work, cobalt oxides were deposited on ceria with rod-like morphology (CeO2NR) and cube-like morphology (CeO2NC) and silica with sphere-like morphology (SiO2NS) via a precipitation-deposition method to investigate the effects of support morphology, surface defects, support reducibility, and the metal-support interactions on redox and catalytic properties. XRD, Raman, XPS, BET, H2-TPR, O2-TPD, CO-TPD, TEM, and TPR/TPO cycling measurements have been mainly employed for catalysts characterization. Compared with CeO2NC and SiO2NS supports, as well as CeO2NC- and SiO2NS-supported cobalt catalysts, CeO2NR counterparts exhibited enhanced reducibility and CO oxidation performance at a lower temperature. Both the apparent activation energy and CO conversion demonstrated the following catalytic activity order: 10 wt % CoO x/CeO2NR > 10 wt % CoO x/CeO2NC > 10 wt % CoO x/SiO2NS. These results showed a strong support-dependent reducibility, CO oxidation, and redox cycling activity/stability of the as-prepared catalysts. Moreover, the significantly enhanced catalytic CO oxidation of the 10 wt % CoO x/CeO2NR catalyst indicated the vital role of CeO2NR support with rich surface oxygen vacancies, superior oxygen storage capacity and mobility, and excellent adsorption/desorption behavior of CO and O2 species.
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21
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The Support Effects on the Direct Conversion of Syngas to Higher Alcohol Synthesis over Copper-Based Catalysts. Catalysts 2019. [DOI: 10.3390/catal9020199] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
The types of supports employed profoundly influence the physicochemical properties and performances of as-prepared catalysts in almost all catalytic systems. Herein, Cu catalysts, with different supports (SiO2, Al2O3), were prepared by a facile impregnation method and used for the direct synthesis of higher alcohols from CO hydrogenation. The prepared catalysts were characterized using multiple techniques, such as X-ray diffraction (XRD), N2 sorption, H2-temperature-programmed reduction (H2-TPR), temperature-programmed desorption of ammonia (NH3-TPD), X-ray photoelectron spectroscopy (XPS) and in situ Fourier-transform infrared spectroscopy (FTIR), etc. Compared to the Cu/Al2O3 catalyst, the Cu/SiO2 catalyst easily promoted the formation of a higher amount of C1 oxygenate species on the surface, which is closely related to the formation of higher alcohols. Simultaneously, the Cu/Al2O3 and Cu/SiO2 catalysts showed obvious differences in the CO conversion, alcohol distribution, and CO2 selectivity, which were probably originated from differences in the structural and physicochemical properties, such as the types of copper species, the reduction behaviors, acidity, and electronic properties. Besides, it was also found that the gap in performances in two kinds of catalysts with the different supports could be narrowed by the addition of potassium because of its neutralization to surface acidy of Al2O3 and the creation of new basic sites, as well as the alteration of electronic properties.
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22
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Li XL, Yang GH, Zhang M, Gao XF, Xie HJ, Bai YX, Wu YQ, Pan JX, Tan YS. Insight into the Correlation between Cu Species Evolution and Ethanol Selectivity in the Direct Ethanol Synthesis from CO Hydrogenation. ChemCatChem 2019. [DOI: 10.1002/cctc.201801888] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Xiao-Li Li
- State Key Laboratory of Coal Conversion Institute of Coal Chemistry; Chinese Academy of Sciences; Taiyuan 030001 P. R. China
- University of Chinese Academy of Sciences; Beijing 100049 P. R. China
| | - Guo-Hui Yang
- State Key Laboratory of Coal Conversion Institute of Coal Chemistry; Chinese Academy of Sciences; Taiyuan 030001 P. R. China
| | - Meng Zhang
- State Key Laboratory of Coal Conversion Institute of Coal Chemistry; Chinese Academy of Sciences; Taiyuan 030001 P. R. China
- University of Chinese Academy of Sciences; Beijing 100049 P. R. China
| | - Xiao-Feng Gao
- State Key Laboratory of Coal Conversion Institute of Coal Chemistry; Chinese Academy of Sciences; Taiyuan 030001 P. R. China
- University of Chinese Academy of Sciences; Beijing 100049 P. R. China
| | - Hong-Juan Xie
- State Key Laboratory of Coal Conversion Institute of Coal Chemistry; Chinese Academy of Sciences; Taiyuan 030001 P. R. China
| | - Yun-Xing Bai
- State Key Laboratory of Coal Conversion Institute of Coal Chemistry; Chinese Academy of Sciences; Taiyuan 030001 P. R. China
- University of Chinese Academy of Sciences; Beijing 100049 P. R. China
| | - Ying-Quan Wu
- State Key Laboratory of Coal Conversion Institute of Coal Chemistry; Chinese Academy of Sciences; Taiyuan 030001 P. R. China
| | - Jun-Xuan Pan
- State Key Laboratory of Coal Conversion Institute of Coal Chemistry; Chinese Academy of Sciences; Taiyuan 030001 P. R. China
| | - Yi-Sheng Tan
- State Key Laboratory of Coal Conversion Institute of Coal Chemistry; Chinese Academy of Sciences; Taiyuan 030001 P. R. China
- National Engineering Research Center for Coal-Based Synthesis Institute of Coal Chemistry; Chinese Academy of Sciences; Taiyuan 030001 P. R. China
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23
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Maity N, Barman S, Abou-Hamad E, D'Elia V, Basset JM. Clean chlorination of silica surfaces by a single-site substitution approach. Dalton Trans 2018; 47:4301-4306. [PMID: 29488534 DOI: 10.1039/c8dt00186c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A chlorination method for the selective substitution of well-defined isolated silanol groups of the silica surface has been developed using the catalytic Appel reaction. Spectroscopic analysis, complemented by elemental microanalysis studies, reveals that a quantitative chlorination could be achieved with highly dehydroxylated silica materials that exclusively possess non-hydrogen bonded silanol groups. The employed method did not leave any carbon or phosphorus residue on the silica surface and can be regarded as a promising tool for the future functionalization of metal oxide surfaces.
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Affiliation(s)
- Niladri Maity
- King Abdullah University of Science & Technology, KAUST Catalysis Center (KCC), 23955-6900 Thuwal, Saudi Arabia. and Department of Chemistry, Indira Gandhi Institute of Technology, Sarang, Dhenkanal, Odisha-759146, India
| | - Samir Barman
- King Abdullah University of Science & Technology, KAUST Catalysis Center (KCC), 23955-6900 Thuwal, Saudi Arabia.
| | - Edy Abou-Hamad
- King Abdullah University of Science & Technology, KAUST Catalysis Center (KCC), 23955-6900 Thuwal, Saudi Arabia.
| | - Valerio D'Elia
- King Abdullah University of Science & Technology, KAUST Catalysis Center (KCC), 23955-6900 Thuwal, Saudi Arabia. and Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), 21210, Payupnai, WangChan, Rayong, Thailand.
| | - Jean-Marie Basset
- King Abdullah University of Science & Technology, KAUST Catalysis Center (KCC), 23955-6900 Thuwal, Saudi Arabia.
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Affiliation(s)
- Ronghua Jin
- Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key, Laboratory of Rare Earth Functional Materials; Shanghai Normal University; No.100 Guilin Rd Shanghai P.R. China
| | - Dongsong Zheng
- Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key, Laboratory of Rare Earth Functional Materials; Shanghai Normal University; No.100 Guilin Rd Shanghai P.R. China
| | - Rui Liu
- Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key, Laboratory of Rare Earth Functional Materials; Shanghai Normal University; No.100 Guilin Rd Shanghai P.R. China
| | - Guohua Liu
- Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key, Laboratory of Rare Earth Functional Materials; Shanghai Normal University; No.100 Guilin Rd Shanghai P.R. China
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25
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Shu X, Jin R, Zhao Z, Cheng T, Liu G. An integrated immobilization strategy manipulates dual active centers to boost enantioselective tandem reactions. Chem Commun (Camb) 2018; 54:13244-13247. [DOI: 10.1039/c8cc07841f] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A bifunctional catalyst assembled by dual species manipulation presents high efficiency in Suzuki coupling-asymmetric transfer hydrogenation tandem reactions.
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Affiliation(s)
- Xiaomin Shu
- Key Laboratory of Resource Chemistry of Ministry of Education
- Key Laboratory of Rare Earth Functional Materials
- Shanghai Normal University
- Shanghai 200234
- China
| | - Ronghua Jin
- Key Laboratory of Resource Chemistry of Ministry of Education
- Key Laboratory of Rare Earth Functional Materials
- Shanghai Normal University
- Shanghai 200234
- China
| | - Zhongrui Zhao
- Key Laboratory of Resource Chemistry of Ministry of Education
- Key Laboratory of Rare Earth Functional Materials
- Shanghai Normal University
- Shanghai 200234
- China
| | - Tanyu Cheng
- Key Laboratory of Resource Chemistry of Ministry of Education
- Key Laboratory of Rare Earth Functional Materials
- Shanghai Normal University
- Shanghai 200234
- China
| | - Guohua Liu
- Key Laboratory of Resource Chemistry of Ministry of Education
- Key Laboratory of Rare Earth Functional Materials
- Shanghai Normal University
- Shanghai 200234
- China
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26
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Wong A, Liu Q, Griffin S, Nicholls A, Regalbuto JR. Synthesis of ultrasmall, homogeneously alloyed, bimetallic nanoparticles on silica supports. Science 2017; 358:1427-1430. [DOI: 10.1126/science.aao6538] [Citation(s) in RCA: 195] [Impact Index Per Article: 27.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2017] [Accepted: 11/13/2017] [Indexed: 01/19/2023]
Abstract
Supported nanoparticles containing more than one metal have a variety of applications in sensing, catalysis, and biomedicine. Common synthesis techniques for this type of material often result in large, unalloyed nanoparticles that lack the interactions between the two metals that give the particles their desired characteristics. We demonstrate a relatively simple, effective, generalizable method to produce highly dispersed, well-alloyed bimetallic nanoparticles. Ten permutations of noble and base metals (platinum, palladium, copper, nickel, and cobalt) were synthesized with average particle sizes from 0.9 to 1.4 nanometers, with tight size distributions. High-resolution imaging and x-ray analysis confirmed the homogeneity of alloying in these ultrasmall nanoparticles.
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Najafpour MM, Salimi S, Madadkhani S, Hołyńska M, Tomo T, Allakhverdiev SI. Nanostructured manganese oxide on silica aerogel: a new catalyst toward water oxidation. PHOTOSYNTHESIS RESEARCH 2016; 130:225-235. [PMID: 27037826 DOI: 10.1007/s11120-016-0247-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/25/2015] [Accepted: 03/10/2016] [Indexed: 06/05/2023]
Abstract
Herein we report on the synthesis and characterization of nano-sized Mn oxide/silica aerogel with low density as a good catalyst toward water oxidation. The composite was synthesized by a simple and low-cost hydrothermal procedure. In the next step, we studied the composite in the presence of cerium(IV) ammonium nitrate and photo-produced Ru(bpy) 33+ as a water-oxidizing catalyst. The low-density composite is a good Mn-based catalyst with turnover frequencies of ~0.3 and 0.5 (mmol O2/(mol Mn·s)) in the presence of Ru(bpy) 33+ and cerium(IV) ammonium nitrate, respectively. In addition to the water-oxidizing activities of the composite under different conditions, its self-healing reaction in the presence of cerium(IV) ammonium nitrate was also studied.
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Affiliation(s)
- Mohammad Mahdi Najafpour
- Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, 45137-66731, Iran.
- Center of Climate Change and Global Warming, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, 45137-66731, Iran.
| | - Saeideh Salimi
- Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, 45137-66731, Iran
| | - Sepideh Madadkhani
- Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, 45137-66731, Iran
| | - Małgorzata Hołyńska
- Fachbereich Chemie and Wissenschaftliches Zentrum für Materialwissenschaften (WZMW), Philipps-Universität Marburg, Hans-Meerwein-Straße, 35032, Marburg, Germany
| | - Tatsuya Tomo
- Department of Biology, Faculty of Science, Tokyo University of Science, Kagurazaka 1-3, Shinjuku-ku, Tokyo, 162-8601, Japan
- PRESTO, Japan Science and Technology Agency (JST), 4-1-8 Honcho Kawaguchi, Saitama, 332-0012, Japan
| | - Suleyman I Allakhverdiev
- Controlled Photobiosynthesis Laboratory, Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya Street 35, Moscow, Russia, 127276.
- Institute of Basic Biological Problems, Russian Academy of Sciences, Pushchino, Moscow Region, Russia, 142290.
- Department of Plant Physiology, Faculty of Biology, M.V. Lomonosov Moscow State University, Leninskie Gory 1-12, Moscow, Russia, 119991.
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28
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Sun X, Zhou S, Schlangen M, Schwarz H. Efficient Room-Temperature Methane Activation by the Closed-Shell, Metal-Free Cluster [OSiOH]+
: A Novel Mechanistic Variant. Chemistry 2016; 22:14257-63. [DOI: 10.1002/chem.201601981] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Indexed: 12/16/2022]
Affiliation(s)
- Xiaoyan Sun
- Institut für Chemie; Technische Universität Berlin; Straße des 17. Juni 135 10623 Berlin Germany
| | - Shaodong Zhou
- Institut für Chemie; Technische Universität Berlin; Straße des 17. Juni 135 10623 Berlin Germany
| | - Maria Schlangen
- Institut für Chemie; Technische Universität Berlin; Straße des 17. Juni 135 10623 Berlin Germany
| | - Helmut Schwarz
- Institut für Chemie; Technische Universität Berlin; Straße des 17. Juni 135 10623 Berlin Germany
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Hoffman AS, Debefve LM, Bendjeriou-Sedjerari A, Ould-Chikh S, Bare SR, Basset JM, Gates BC. Transmission and fluorescence X-ray absorption spectroscopy cell/flow reactor for powder samples under vacuum or in reactive atmospheres. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:073108. [PMID: 27475549 DOI: 10.1063/1.4958824] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Accepted: 07/01/2016] [Indexed: 06/06/2023]
Abstract
X-ray absorption spectroscopy is an element-specific technique for probing the local atomic-scale environment around an absorber atom. It is widely used to investigate the structures of liquids and solids, being especially valuable for characterization of solid-supported catalysts. Reported cell designs are limited in capabilities-to fluorescence or transmission and to static or flowing atmospheres, or to vacuum. Our goal was to design a robust and widely applicable cell for catalyst characterizations under all these conditions-to allow tracking of changes during genesis and during operation, both under vacuum and in reactive atmospheres. Herein, we report the design of such a cell and a demonstration of its operation both with a sample under dynamic vacuum and in the presence of gases flowing at temperatures up to 300 °C, showing data obtained with both fluorescence and transmission detection. The cell allows more flexibility in catalyst characterization than any reported.
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Affiliation(s)
- A S Hoffman
- Department of Chemical Engineering, University of California at Davis, Davis, California 95616, USA
| | - L M Debefve
- Department of Chemical Engineering, University of California at Davis, Davis, California 95616, USA
| | - A Bendjeriou-Sedjerari
- KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), 23955-6900 Thuwal, Saudi Arabia
| | - S Ould-Chikh
- KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), 23955-6900 Thuwal, Saudi Arabia
| | - Simon R Bare
- SLAC National Accelerator Laboratory, SSRL, Menlo Park, California 94025, USA
| | - J-M Basset
- KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), 23955-6900 Thuwal, Saudi Arabia
| | - B C Gates
- Department of Chemical Engineering, University of California at Davis, Davis, California 95616, USA
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30
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Yang M, Wu H, Wu H, Huang C, Weng W, Chen M, Wan H. Preparation and characterization of a highly dispersed and stable Ni catalyst with a microporous nanosilica support. RSC Adv 2016. [DOI: 10.1039/c6ra15358e] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Microporous Stöber silica was synthesized by controlling the post-drying conditions. Using the silica as support, a highly dispersed Ni catalyst was successfully prepared by a simple impregnation method.
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Affiliation(s)
- Meihua Yang
- State Key Laboratory of Physical Chemistry of Solid Surfaces
- National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters
- Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
| | - Huanhuan Wu
- State Key Laboratory of Physical Chemistry of Solid Surfaces
- National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters
- Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
| | - Huayi Wu
- State Key Laboratory of Physical Chemistry of Solid Surfaces
- National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters
- Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
| | - Chuanjing Huang
- State Key Laboratory of Physical Chemistry of Solid Surfaces
- National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters
- Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
| | - Weizheng Weng
- State Key Laboratory of Physical Chemistry of Solid Surfaces
- National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters
- Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
| | - Mingshu Chen
- State Key Laboratory of Physical Chemistry of Solid Surfaces
- National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters
- Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
| | - Huilin Wan
- State Key Laboratory of Physical Chemistry of Solid Surfaces
- National Engineering Laboratory for Green Chemical Productions of Alcohols, Ethers and Esters
- Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
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