1
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Palermo V, Camargo López JM, Brijaldo MH, Acevedo S, Mancipe S, Castillo JC, Rojas HA, Passos FB, Romanelli GP, Martínez JJ. Biochar-MgO from Soursop Seeds in the Production of Biofuel Additive Intermediates. Chempluschem 2023; 88:e202300401. [PMID: 37827994 DOI: 10.1002/cplu.202300401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2023] [Revised: 10/03/2023] [Accepted: 10/04/2023] [Indexed: 10/14/2023]
Abstract
The conversion of residual biomass from fruit seeds into biochar can be achieved using MgCl2 as an activating agent and calcining at 700 °C. The resulting MgO-biochars were employed in the aldol condensation reaction between furfural and acetone. This reaction is essential as the first step in the obtention of biofuels derived from biomass. The biochars were characterized through various physicochemical techniques, revealing that the presence of MgO nanoparticles deposited on the carbon surface modifies the structural and acidic-basic properties of the carbonaceous materials with a graphitic structure. The biochar with a surface content of MgO of 0.34 % w/w enables the achievement of 100 % of selectivity towards 4-(2-furanyl)-3-buten-2-one (I) with quantitative conversions under optimized conditions. This property highlights the potential of using this type of biochar, commonly used for CO2 capture, as a versatile acidic-basic catalyst, thereby introducing a novel approach to sustainable chemistry.
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Affiliation(s)
- Valeria Palermo
- Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco" (CINDECA-CCT La Plata-CONICET-CIC-PBA), Universidad Nacional de La Plata, Calle 47 No 257, B1900AJK, La Plata, Argentina
| | - Jhoan M Camargo López
- Escuela de Ciencias Administrativas y Económicas, Facultad de estudios a Distancia, Universidad Pedagógica y Tecnológica de Colombia, Av. Central Norte 39-115, Tunja, 150003, Colombia
- Escuela de Ciencias Químicas, Facultad de Ciencias, Universidad Pedagógica y Tecnológica de Colombia UPTC, Av. Central Norte, vía Paipa, Tunja, Boyacá, 150003, Colombia
| | - María H Brijaldo
- Escuela de Ciencias Administrativas y Económicas, Facultad de estudios a Distancia, Universidad Pedagógica y Tecnológica de Colombia, Av. Central Norte 39-115, Tunja, 150003, Colombia
| | - Sergio Acevedo
- Escuela de Ciencias Administrativas y Económicas, Facultad de estudios a Distancia, Universidad Pedagógica y Tecnológica de Colombia, Av. Central Norte 39-115, Tunja, 150003, Colombia
- Escuela de Ciencias Básicas, Universidad Nacional Abierta y a Distancia UNAD, Calle 5 # 1-08, Sogamoso, Colombia
| | - Sonia Mancipe
- Escuela de Ciencias Químicas, Facultad de Ciencias, Universidad Pedagógica y Tecnológica de Colombia UPTC, Av. Central Norte, vía Paipa, Tunja, Boyacá, 150003, Colombia
| | - Juan-Carlos Castillo
- Escuela de Ciencias Químicas, Facultad de Ciencias, Universidad Pedagógica y Tecnológica de Colombia UPTC, Av. Central Norte, vía Paipa, Tunja, Boyacá, 150003, Colombia
| | - Hugo A Rojas
- Escuela de Ciencias Químicas, Facultad de Ciencias, Universidad Pedagógica y Tecnológica de Colombia UPTC, Av. Central Norte, vía Paipa, Tunja, Boyacá, 150003, Colombia
| | - Fabio B Passos
- Departamento de Engenharia Química e de Petróleo, Universidade Federal Fluminense, Niterói, 24210-240, Brazil
| | - Gustavo P Romanelli
- Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco" (CINDECA-CCT La Plata-CONICET-CIC-PBA), Universidad Nacional de La Plata, Calle 47 No 257, B1900AJK, La Plata, Argentina
| | - José J Martínez
- Escuela de Ciencias Químicas, Facultad de Ciencias, Universidad Pedagógica y Tecnológica de Colombia UPTC, Av. Central Norte, vía Paipa, Tunja, Boyacá, 150003, Colombia
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2
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Monsef R, Salavati-Niasari M, Masjedi-Arani M. Hydrothermal Synthesis of Spinel-Perovskite Li–Mn–Fe–Si Nanocomposites for Electrochemical Hydrogen Storage. Inorg Chem 2022; 61:6750-6763. [DOI: 10.1021/acs.inorgchem.1c03605] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rozita Monsef
- Institute of Nano Science and Nano Technology, University of Kashan, P. O. Box 87317-51167, Kashan 87317-51167, I. R. Iran
| | - Masoud Salavati-Niasari
- Institute of Nano Science and Nano Technology, University of Kashan, P. O. Box 87317-51167, Kashan 87317-51167, I. R. Iran
| | - Maryam Masjedi-Arani
- Institute of Nano Science and Nano Technology, University of Kashan, P. O. Box 87317-51167, Kashan 87317-51167, I. R. Iran
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3
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Thang HV, Chen HYT. Do stoichiometric or nonstoichiometric models of a polar surface affect their structural, energetic and electronic structure properties? A DFT case study of Ru/MgO(111). JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:214007. [PMID: 35189606 DOI: 10.1088/1361-648x/ac5704] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2021] [Accepted: 02/21/2022] [Indexed: 06/14/2023]
Abstract
The structural, energetic and electronic structure properties of stoichiometric and nonstoichiometric slab models of bare MgO(111) and Ru/MgO(111) with different coverages of 1 monolayer (ML), 1/4 ML and 1/16 ML have been investigated using spin-polarized density functional theory. Calculated results show that the structural, energetic properties and charge transfer of both bare MgO(111) and Ru/MgO(111) are independent of the stoichiometric and nonstoichiometric models. In contrast, their density of state (DOS) profiles demonstrate metal and half-metal characters for the stoichiometric and nonstoichiometric bare MgO(111) surfaces, respectively. The Ru-O orbital coupling characters of these two types of Ru/MgO(111) models are also different. This work indicates that for a polar surface model, the calculated features and trends of the structural and energetic properties, charge distributions and magnetic structures might not be affected by their stoichiometric and nonstoichiometric models; however, the detailed features of their DOS features would strongly depend on the models constructed.
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Affiliation(s)
- Ho Viet Thang
- The University of Danang, University of Science and Technology, 54 Nguyen Luong Bang, Danang 550000, Vietnam
| | - Hsin-Yi Tiffany Chen
- Department of Engineering and System Science, National Tsing Hua University, 101, Sec. 2, Kuang-Fu Road, Hsinchu 300044, Taiwan
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4
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Zhang J, Wu TS, Thang HV, Tseng KY, Hao X, Xu B, Chen HYT, Peng YK. Cluster Nanozymes with Optimized Reactivity and Utilization of Active Sites for Effective Peroxidase (and Oxidase) Mimicking. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2104844. [PMID: 34825478 DOI: 10.1002/smll.202104844] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Revised: 09/26/2021] [Indexed: 06/13/2023]
Abstract
Single-atom catalysts have attracted attention in the past decade since they maximize the utilization of active sites and facilitate the understanding of product distribution in some catalytic reactions. Recently, this idea has been extended to single-atom nanozymes (SAzymes) for the mimicking of natural enzymes such as horseradish peroxidase (HRP) often used in bioanalytical applications. Herein, it is demonstrated that those SAzymes without constructing the reaction pocket of HRP still undergo the OH radical-mediated pathway like most of the reported nanozymes. Their positively charged single-atom centers resulting from support electronegative oxygen/nitrogen hinder the reductive conversion of H2 O2 to OH radicals and hence display low activity per site. In contrast, it is found that this step can be facilitated over their metallic counterparts on cluster nanozymes with much higher site activity and atom efficiency (cf. SAzymes with 100% atom utilization). Besides the mimicking of HRP in glucose detection, cluster nanozymes are also demonstrated as a better oxidase mimetic for glutathione detection.
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Affiliation(s)
- Jieru Zhang
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong SAR, China
| | - Tai-Sing Wu
- National Synchrotron Radiation Research Centre, Hsinchu, 30076, Taiwan
| | - Ho Viet Thang
- The University of Da-Nang, University of Science and Technology, Da-Nang, 550000, Vietnam
- Department of Engineering and System Science, National Tsing Hua University, Hsinchu, 300044, Taiwan
| | - Kai-Yu Tseng
- Department of Engineering and System Science, National Tsing Hua University, Hsinchu, 300044, Taiwan
| | - Xiaodong Hao
- Materials Institute of Atomic and Molecular Science, Shaanxi University of Science and Technology, Xi'an, 710021, China
| | - Bingshe Xu
- Materials Institute of Atomic and Molecular Science, Shaanxi University of Science and Technology, Xi'an, 710021, China
| | - Hsin-Yi Tiffany Chen
- Department of Engineering and System Science, National Tsing Hua University, Hsinchu, 300044, Taiwan
| | - Yung-Kang Peng
- Department of Chemistry, City University of Hong Kong, Kowloon, Hong Kong SAR, China
- City University of Hong Kong Shenzhen Research Institute, Shenzhen, 518057, China
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5
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Wang H, Ren X, Liu Z, Lv B. Chemical conversion based on the crystal facet effect of transition metal oxides and construction methods for sharp-faced nanocrystals. Chem Commun (Camb) 2022; 58:908-924. [PMID: 34981109 DOI: 10.1039/d1cc06721d] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
In-depth research has found that the nanocrystal facet of transition metal oxides (TMOs) greatly affects their heterogeneous catalytic performance, as well as the property of photocatalysis, gas sensing, electrochemical reaction, etc. that are all involved in chemical conversion processes. Therefore, the facet-dependent properties of TMO nanocrystals have been fully and carefully studied by combining systematic experiments and theoretical calculations, and mechanisms of chemical reactions are accurately explained at the molecular level, which will be closer to the essence of reactions. Evidently, as an accurate investigation on crystal facets, well-defined TMO nanocrystals are the basis and premise for obtaining relevant credible results, and shape-controlled synthesis of TMO nanocrystals thereby has received great attention and development. The success in understanding of facet-dependent properties and shape-controlled synthesis of TMO nanocrystals is highly valuable for the control of reaction and the design of high-efficiency TMO nanocrystal catalysts as well as other functional materials in practical applications.
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Affiliation(s)
- Huixiang Wang
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001, China.
| | - Xiaobo Ren
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001, China.
| | - Zhong Liu
- Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, 810008, China. .,Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining, 810008, China
| | - Baoliang Lv
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001, China.
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6
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Manae MA, Dheer L, Rai S, Shetty S, Waghmare UV. Activation of CO 2 and CH 4 on MgO surfaces: mechanistic insights from first-principles theory. Phys Chem Chem Phys 2022; 24:1415-1423. [PMID: 34982078 DOI: 10.1039/d1cp04152e] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
One of the most challenging topics in heterogeneous catalysis is conversion of CH4 to higher hydrocarbons. Direct conversion of CH4 to ethylene can be achieved via the oxidative coupling of methane (OCM) reaction. Despite studies which have shown MgO to activate CH4 and initiate the OCM reaction, its large-scale applications face a significant impediment due to formation of a byproduct, CO2, and poisoning of the catalyst due to carbonate formation. In the present work, we address two aspects of the OCM reaction on MgO surfaces: carbonate formation on the surface of the catalyst, and (dissociative) adsorption of CH4. We use first-principles density functional theoretical calculations to determine the energetics and underlying mechanisms of interaction of CO2 and CH4 with various surfaces of MgO: (100), (110), and (111) (both Mg- and O-terminations), and the seldom studied, hydroxylated (111) MgO surface with O-termination. We find that the strength of the interaction of CO2 with MgO surfaces depends on several factors: their surface energies, coordination number of surface O atoms, and ability to donate electrons. However, the O-terminated (111) surface of MgO bucks all aforementioned factors, with only oxygen richness affecting its reactivity towards CO2. The interaction of CH4 with MgO surfaces depends primarily on the coordination number of the surface O atoms and the orientation of the CH4 molecule with respect to the surface. Finally, we provide insights into (a) formation of surface carbonates, which is relevant to CO2 capture and conversion, and (b) C-H bond activation on MgO surfaces, which is crucial for direct conversion of CH4 to value-added chemicals.
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Affiliation(s)
- Meghna A Manae
- Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560064, India.
| | - Lakshay Dheer
- Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560064, India.
| | - Sandhya Rai
- Shell India Markets Pvt. Ltd, Mahadeva Kodigehalli, Bengaluru, Karnataka 562149, India
| | - Sharan Shetty
- Shell India Markets Pvt. Ltd, Mahadeva Kodigehalli, Bengaluru, Karnataka 562149, India
| | - Umesh V Waghmare
- Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560064, India.
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7
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Balderas RI, Settle AE, York A, Conklin DR, Pham HN, Metz PC, Page K, Datye AK, Trewyn BG, Vardon DR, Richards RM. MgO(111) Nanocatalyst for Biomass Conversion: A Study of Carbon Coating Effects on Catalyst Faceting and Performance. Catal Letters 2022. [DOI: 10.1007/s10562-021-03879-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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8
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Thomele D, Baumann SO, Schneider J, Sternig AK, Shulda S, Richards RM, Schwab T, Zickler GA, Bourret GR, Diwald O. Cubes to Cubes: Organization of MgO Particles into One-Dimensional and Two-Dimensional Nanostructures. CRYSTAL GROWTH & DESIGN 2021; 21:4674-4682. [PMID: 34381312 PMCID: PMC8343528 DOI: 10.1021/acs.cgd.1c00535] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 06/22/2021] [Indexed: 05/29/2023]
Abstract
Developing simple, inexpensive, and environmentally benign approaches to integrate morphologically well-defined nanoscale building blocks into larger high surface area materials is a key challenge in materials design and processing. In this work, we investigate the fundamental surface phenomena between MgO and water (both adsorption and desorption) with particles prepared via a vapor-phase process (MgO nanocubes) and a modified aerogel process (MgO(111) nanosheets). Through these studies, we unravel a strategy to assemble individual MgO nanoparticles into extended faceted single-crystalline MgO nanosheets and nanorods with well-defined exposed surfaces and edges. This reorganization can be triggered by the presence of H2O vapor or bulk liquid water. Water adsorption and the progressive conversion of vapor-phase grown oxide particles into hydroxides give rise to either one-dimensional or two-dimensional (1D or 2D) structures of high dispersion and surface area. The resulting Mg(OH)2 lamella with a predominant (001) surface termination are well-suited precursor structures for their topotactic conversion into laterally extended and uniform MgO(111) grain surface configurations. To understand the potential of polar (111) surfaces for faceting and surface reconstruction effects associated with water desorption, we investigated the stability of MgO(111) nanosheets during vacuum annealing and electron beam exposure. The significant surface reconstruction of the MgO(111) surfaces observed shows that adsorbate-free (111)-terminated surfaces of unsupported MgO nanostructures reconstruct rather than remain as charged planes of either three-fold coordinated O2- ion or Mg2+ ions. Thus, here we demonstrate the role water can play in surface formation and reconstruction by bridging wet chemical and surface science inspired approaches.
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Affiliation(s)
- Daniel Thomele
- Department
of Chemistry and Physics of Materials, Paris-Lodron
University Salzburg, Jakob Haringerstrasse 2a, Salzburg, 5020, Austria
- Institute
of Particle Technology (LFG), Friedrich-Alexander-Universität
Erlangen-Nürnberg, Cauerstraße 4, Erlangen, 91058, Germany
| | - Stefan O. Baumann
- Institute
of Particle Technology (LFG), Friedrich-Alexander-Universität
Erlangen-Nürnberg, Cauerstraße 4, Erlangen, 91058, Germany
| | - Johannes Schneider
- Department
of Chemistry and Physics of Materials, Paris-Lodron
University Salzburg, Jakob Haringerstrasse 2a, Salzburg, 5020, Austria
- Institute
of Particle Technology (LFG), Friedrich-Alexander-Universität
Erlangen-Nürnberg, Cauerstraße 4, Erlangen, 91058, Germany
| | - Andreas K. Sternig
- Institute
of Particle Technology (LFG), Friedrich-Alexander-Universität
Erlangen-Nürnberg, Cauerstraße 4, Erlangen, 91058, Germany
| | - Sarah Shulda
- Department
of Chemistry, Colorado School of Mines, Golden, Colorado 80401, United States
| | - Ryan M. Richards
- Department
of Chemistry, Colorado School of Mines, Golden, Colorado 80401, United States
| | - Thomas Schwab
- Department
of Chemistry and Physics of Materials, Paris-Lodron
University Salzburg, Jakob Haringerstrasse 2a, Salzburg, 5020, Austria
| | - Gregor A. Zickler
- Department
of Chemistry and Physics of Materials, Paris-Lodron
University Salzburg, Jakob Haringerstrasse 2a, Salzburg, 5020, Austria
| | - Gilles R. Bourret
- Department
of Chemistry and Physics of Materials, Paris-Lodron
University Salzburg, Jakob Haringerstrasse 2a, Salzburg, 5020, Austria
| | - Oliver Diwald
- Department
of Chemistry and Physics of Materials, Paris-Lodron
University Salzburg, Jakob Haringerstrasse 2a, Salzburg, 5020, Austria
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9
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Electro catalytic oxidation reactions for harvesting alternative energy over non noble metal oxides: Are we a step closer to sustainable energy solution? ADV POWDER TECHNOL 2021. [DOI: 10.1016/j.apt.2021.06.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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10
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Schwab T, Aicher K, Razouq H, Zickler GA, Diwald O. Segregation Engineering in MgO Nanoparticle-Derived Ceramics: The Impact of Calcium and Barium Admixtures on the Microstructure and Light Emission Properties. ACS APPLIED MATERIALS & INTERFACES 2021; 13:25493-25502. [PMID: 34009927 PMCID: PMC8176451 DOI: 10.1021/acsami.1c02931] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Accepted: 05/06/2021] [Indexed: 06/12/2023]
Abstract
Nanostructured segregates of alkaline earth oxides exhibit bright photoluminescence emission and great potential as components of earth-abundant inorganic phosphors. We evaluated segregation engineering of Ca2+- and Ba2+-admixtures in sintered MgO nanocube-derived compacts. Compaction and sintering transform the nanoparticle agglomerates into ceramics with residual porosities of Φ = 24-28%. Size mismatch drives admixture segregation into the intergranular region, where they form thin metal oxide films and inclusions decorating grain boundaries and pores. An important trend in the median grain size evolution of the sintered bodies with dCa(10 at. %) = 90 nm < dBa(1 at. %) = 160 nm < dMgO = 250 nm ∼ dCa(1 at. %) = 280 nm < dBa(10 at. %) = 870 nm is rationalized by segregation and interface energies, barriers for ion diffusion, admixture concentration, and the increasing surface basicity of the grains during processing. We outline the potential of admixtures on interface engineering in MgO nanocrystal-derived ceramics and demonstrate that in the sintered compacts, the photoluminescence emission originating from the grain surfaces is retained. Interior parts of the ceramic, which are accessible to molecules from the gas phase, contribute with oxygen partial pressure-dependent intensities to light emission.
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11
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Shinagawa T, Chigane M, Izaki M. Electrochemical Growth of Mg(OH) x Layered Films Stacked Parallel to the Substrates and Their Thermal Conversion to (111)-Oriented Nanoporous MgO Films. ACS OMEGA 2021; 6:2312-2317. [PMID: 33521469 PMCID: PMC7841930 DOI: 10.1021/acsomega.0c05619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Accepted: 12/30/2020] [Indexed: 06/12/2023]
Abstract
Stacking layered metal hydroxide films parallel to a substrate is challenging. Here, we demonstrate a simple and rapid electrodeposition method for stacking magnesium hydroxide layered films. Room-temperature cathodic electrolysis (40 mA cm-2) in a Mg(NO3)2 aqueous solution induces the deposition of ⟨001⟩-oriented Mg(OH) x layered films stacked parallel to the substrate at the deposition rate of ∼2 μm min-1. The obtained Mg(OH) x layered films undergo an overall oriented transformation by heat treatment to form ⟨111⟩-oriented nanoporous MgO films.
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Affiliation(s)
- Tsutomu Shinagawa
- Electronic
Materials Research Division, Morinomiya Center, Osaka Research Institute of Industrial Science and Technology (ORIST), Osaka 536-8553, Japan
- Graduate
School of Engineering, Toyohashi University
of Technology, Toyohashi, Aichi 441-8580, Japan
| | - Masaya Chigane
- Electronic
Materials Research Division, Morinomiya Center, Osaka Research Institute of Industrial Science and Technology (ORIST), Osaka 536-8553, Japan
| | - Masanobu Izaki
- Graduate
School of Engineering, Toyohashi University
of Technology, Toyohashi, Aichi 441-8580, Japan
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12
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Susman MD, Pham HN, Zhao X, West DH, Chinta S, Bollini P, Datye AK, Rimer JD. Synthesis of NiO Crystals Exposing Stable High‐Index Facets. Angew Chem Int Ed Engl 2020; 59:15119-15123. [DOI: 10.1002/anie.202003390] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Indexed: 11/10/2022]
Affiliation(s)
- Mariano D. Susman
- Department of Chemical and Biomolecular Engineering University of Houston 4726 Calhoun Road Houston TX 77204-4004 USA
| | - Hien N. Pham
- Department of Chemical and Biological Engineering and Center for Microengineered Materials University of New Mexico Albuquerque NM 87131-0001 USA
| | - Xiaohui Zhao
- Department of Chemical and Biomolecular Engineering University of Houston 4726 Calhoun Road Houston TX 77204-4004 USA
| | - David H. West
- SABIC Technology Center 1600 Industrial Blvd. Sugar Land Houston TX 77478 USA
| | | | - Praveen Bollini
- Department of Chemical and Biomolecular Engineering University of Houston 4726 Calhoun Road Houston TX 77204-4004 USA
| | - Abhaya K. Datye
- Department of Chemical and Biological Engineering and Center for Microengineered Materials University of New Mexico Albuquerque NM 87131-0001 USA
| | - Jeffrey D. Rimer
- Department of Chemical and Biomolecular Engineering University of Houston 4726 Calhoun Road Houston TX 77204-4004 USA
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13
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Susman MD, Pham HN, Zhao X, West DH, Chinta S, Bollini P, Datye AK, Rimer JD. Synthesis of NiO Crystals Exposing Stable High‐Index Facets. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202003390] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Mariano D. Susman
- Department of Chemical and Biomolecular Engineering University of Houston 4726 Calhoun Road Houston TX 77204-4004 USA
| | - Hien N. Pham
- Department of Chemical and Biological Engineering and Center for Microengineered Materials University of New Mexico Albuquerque NM 87131-0001 USA
| | - Xiaohui Zhao
- Department of Chemical and Biomolecular Engineering University of Houston 4726 Calhoun Road Houston TX 77204-4004 USA
| | - David H. West
- SABIC Technology Center 1600 Industrial Blvd. Sugar Land Houston TX 77478 USA
| | | | - Praveen Bollini
- Department of Chemical and Biomolecular Engineering University of Houston 4726 Calhoun Road Houston TX 77204-4004 USA
| | - Abhaya K. Datye
- Department of Chemical and Biological Engineering and Center for Microengineered Materials University of New Mexico Albuquerque NM 87131-0001 USA
| | - Jeffrey D. Rimer
- Department of Chemical and Biomolecular Engineering University of Houston 4726 Calhoun Road Houston TX 77204-4004 USA
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14
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Wu S, Peng YK, Chen TY, Mo J, Large A, McPherson I, Chou HL, Wilkinson I, Venturini F, Grinter D, Ferrer Escorihuela P, Held G, Tsang SCE. Removal of Hydrogen Poisoning by Electrostatically Polar MgO Support for Low-Pressure NH3 Synthesis at a High Rate over the Ru Catalyst. ACS Catal 2020. [DOI: 10.1021/acscatal.0c00954] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Simson Wu
- Wolfson Catalysis Centre, Department of Chemistry University of Oxford, Oxford OX1 3QR, U.K
| | - Yung-Kang Peng
- Wolfson Catalysis Centre, Department of Chemistry University of Oxford, Oxford OX1 3QR, U.K
| | - Tian-Yi Chen
- Wolfson Catalysis Centre, Department of Chemistry University of Oxford, Oxford OX1 3QR, U.K
| | - Jiaying Mo
- Wolfson Catalysis Centre, Department of Chemistry University of Oxford, Oxford OX1 3QR, U.K
| | - Alex Large
- University of Reading, Reading RG6 6UR, U.K
| | - Ian McPherson
- Wolfson Catalysis Centre, Department of Chemistry University of Oxford, Oxford OX1 3QR, U.K
| | - Hung-Lung Chou
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 10617, Taiwan
| | - Ian Wilkinson
- Siemens plc, CT NTF, Wharf Road, Oxford OX29 4BP, U.K
| | | | | | | | - Georg Held
- University of Reading, Reading RG6 6UR, U.K
- Diamond Light Source, Didcot OX11 0DE, U.K
| | - Shik Chi Edman Tsang
- Wolfson Catalysis Centre, Department of Chemistry University of Oxford, Oxford OX1 3QR, U.K
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15
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Cheng S, Metzger LE, Martínez-Monteagudo SI. One-pot synthesis of sweetening syrup from lactose. Sci Rep 2020; 10:2730. [PMID: 32066852 PMCID: PMC7026174 DOI: 10.1038/s41598-020-59704-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Accepted: 02/03/2020] [Indexed: 12/22/2022] Open
Abstract
Lactose has become the main byproduct of many dairy products and ingredients. Current applications of lactose are insufficient to use the recovered lactose from manufacturing operations. Here we exemplified a new process for converting aqueous lactose into a sweeting syrup via one-pot synthesis. The synthesis consisted of two-steps: (1) enzymatic hydrolysis of lactose and (2) catalytic isomerization over MgO/SiO2. The hydrolysis of lactose over β-galactosidase converted 95.77 ± 0.67% of lactose into glucose and galactose. The catalytic isomerization was performed over MgO/SiO2 with different MgO loadings (10-40 wt.%). A battery of tests was conducted to characterize the different catalysts, including surface properties, basicity, and microstructure. The one-pot synthesis, enzymatic hydrolysis and catalytic isomerization over 20%-MgO/SiO2, converted 99.3% of lactose into a sweetening syrup made of glucose (30.48%), galactose (33.51%), fructose (16.92%), D-tagatose (10.54%), and lactulose (3.62%). The outcomes of this research present an opportunity for expanding the utilization of lactose.
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Affiliation(s)
- Shouyun Cheng
- South Dakota State University, Dairy and Food Science Department, Brookings, SD, 57006, USA
| | - Lloyd E Metzger
- South Dakota State University, Dairy and Food Science Department, Brookings, SD, 57006, USA
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16
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17
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Hermawan A, Hanindriyo AT, Ramadhan ER, Asakura Y, Hasegawa T, Hongo K, Inada M, Maezono R, Yin S. Octahedral morphology of NiO with (111) facet synthesized from the transformation of NiOHCl for the NOx detection and degradation: experiment and DFT calculation. Inorg Chem Front 2020. [DOI: 10.1039/d0qi00682c] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
NiO with polar (111) facets was successfully synthesized from the transformation of a layered NiOHCl, exhibiting excellent NOx detection and degradation activity.
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Affiliation(s)
- Angga Hermawan
- Institute of Multidisciplinary Research for Advanced Materials (IMRAM)
- Tohoku University 2-1-1 Katahira
- Sendai
- Japan
| | | | | | - Yusuke Asakura
- Institute of Multidisciplinary Research for Advanced Materials (IMRAM)
- Tohoku University 2-1-1 Katahira
- Sendai
- Japan
| | - Takuya Hasegawa
- Institute of Multidisciplinary Research for Advanced Materials (IMRAM)
- Tohoku University 2-1-1 Katahira
- Sendai
- Japan
| | - Kenta Hongo
- School of Information Science
- JAIST
- Nomi
- Japan
- Research Center for Advanced Computing Infrastructure
| | - Miki Inada
- Center of Advanced Instrumental Analysis
- Kyushu University
- Kasuga-Shi
- Japan
| | | | - Shu Yin
- Institute of Multidisciplinary Research for Advanced Materials (IMRAM)
- Tohoku University 2-1-1 Katahira
- Sendai
- Japan
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18
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Niedermaier M, Taniteerawong C, Schwab T, Zickler G, Bernardi J, Diwald O. Impurity Segregation and Nanoparticle Reorganization of Indium Doped MgO Cubes. CHEMNANOMAT : CHEMISTRY OF NANOMATERIALS FOR ENERGY, BIOLOGY AND MORE 2019; 5:634-641. [PMID: 31231606 PMCID: PMC6563704 DOI: 10.1002/cnma.201900077] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/02/2019] [Accepted: 02/26/2019] [Indexed: 06/09/2023]
Abstract
Metal oxide nanocomposites are non-equilibrium solids and promising precursors for functional materials. Annealing of such materials can provide control over impurity segregation and, depending on the level of consolidation, represents a versatile approach to engineer free surfaces, particle-particle interfaces and grain boundaries. Starting with indium-magnesium-oxide nanoparticle powders obtained via injection of an indium organic precursor into the magnesium combustion flame and subsequent particle quenching in argon, we investigated the stability of the trivalent In3+ ions in the host lattice of MgO nanoparticles by determining grain growth, morphology evolution and impurity segregation. The latter process is initiated by vacuum annealing at 873 K and can be tracked at 1173 K on a time scale of minutes. In the first instance the surface segregated indium wets the nanoparticle interfaces. After prolonged annealing indium evaporates and leaves the powder via the gas phase. Resulting MgO nanocubes are devoid of residual indium, regain their high morphological definition and show spectroscopic fingerprints (UV Diffuse Reflectance and Photoluminescence emission) that are characteristic of electronically unperturbed MgO cube corner and edge features. The results of this combined XRD, TEM, and spectroscopy study reveal the parameter window within which control over indium segregation is used to introduce a semiconducting metal oxide component into the intergranular region between insulating MgO nanograins.
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Affiliation(s)
- Matthias Niedermaier
- Department of Chemistry and Physics of MaterialsUniversity of SalzburgJakob-Haringer-Strasse 2a5020SalzburgAustria
| | - Chatpawee Taniteerawong
- Department of Chemistry and Physics of MaterialsUniversity of SalzburgJakob-Haringer-Strasse 2a5020SalzburgAustria
| | - Thomas Schwab
- Department of Chemistry and Physics of MaterialsUniversity of SalzburgJakob-Haringer-Strasse 2a5020SalzburgAustria
| | - Gregor Zickler
- Department of Chemistry and Physics of MaterialsUniversity of SalzburgJakob-Haringer-Strasse 2a5020SalzburgAustria
| | - Johannes Bernardi
- University Service Centre for Transmission Electron MicroscopyTechnische Universität Wien1040ViennaAustria
| | - Oliver Diwald
- Department of Chemistry and Physics of MaterialsUniversity of SalzburgJakob-Haringer-Strasse 2a5020SalzburgAustria
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19
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Thomele D, Gheisi AR, Niedermaier M, Elsässer MS, Bernardi J, Grönbeck H, Diwald O. Thin water films and particle morphology evolution in nanocrystalline MgO. JOURNAL OF THE AMERICAN CERAMIC SOCIETY. AMERICAN CERAMIC SOCIETY 2018; 101:4994-5003. [PMID: 30333631 PMCID: PMC6175089 DOI: 10.1111/jace.15775] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Accepted: 05/05/2018] [Indexed: 05/29/2023]
Abstract
A key question in the field of ceramics and catalysis is how and to what extent residual water in the reactive environment of a metal oxide particle powder affects particle coarsening and morphology. With X-ray Diffraction (XRD) and Transmission Electron Microscopy (TEM), we investigated annealing-induced morphology changes on powders of MgO nanocubes in different gaseous H2O environments. The use of such a model system for particle powders enabled us to describe how adsorbed water that originates from short exposure to air determines the evolution of MgO grain size, morphology, and microstructure. While cubic nanoparticles with a predominant abundance of (100) surface planes retain their shape after annealing to T = 1173 K under continuous pumping with a base pressure of water p(H2O) = 10-5 mbar, higher water partial pressures promote mass transport on the surfaces and across interfaces of such particle systems. This leads to substantial growth and intergrowth of particles and simultaneously favors the formation of step edges and shallow protrusions on terraces. The mass transfer is promoted by thin films of water providing a two-dimensional solvent for Mg2+ ion hydration. In addition, we obtained direct evidence for hydroxylation-induced stabilization of (110) faces and step edges of the grain surfaces.
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Affiliation(s)
- Daniel Thomele
- Department of Chemistry and Physics of MaterialsParis‐Lodron University SalzburgSalzburgAustria
| | - Amir R. Gheisi
- Institute of Particle TechnologyFriedrich‐Alexander Universität Erlangen‐NürnbergErlangenGermany
| | - Matthias Niedermaier
- Department of Chemistry and Physics of MaterialsParis‐Lodron University SalzburgSalzburgAustria
| | - Michael S. Elsässer
- Department of Chemistry and Physics of MaterialsParis‐Lodron University SalzburgSalzburgAustria
| | - Johannes Bernardi
- University Service Center for Transmission Electron MicroscopyTechnische Universität WienViennaAustria
| | - Henrik Grönbeck
- Department of Physics and Competence Centre for CatalysisChalmers University of TechnologyGothenburgSweden
| | - Oliver Diwald
- Department of Chemistry and Physics of MaterialsParis‐Lodron University SalzburgSalzburgAustria
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20
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Mutch GA, Shulda S, McCue AJ, Menart MJ, Ciobanu CV, Ngo C, Anderson JA, Richards RM, Vega-Maza D. Carbon Capture by Metal Oxides: Unleashing the Potential of the (111) Facet. J Am Chem Soc 2018; 140:4736-4742. [PMID: 29553264 DOI: 10.1021/jacs.8b01845] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Solid metal oxides for carbon capture exhibit reduced adsorption capacity following high-temperature exposure, due to surface area reduction by sintering. Furthermore, only low-coordinate corner/edge sites on the thermodynamically stable (100) facet display favorable binding toward CO2, providing inherently low capacity. The (111) facet, however, exhibits a high concentration of low-coordinate sites. In this work, MgO(111) nanosheets displayed high capacity for CO2, as well as a ∼65% increase in capacity despite a ∼30% reduction in surface area following sintering (0.77 mmol g-1 @ 227 m2 g-1 vs 1.28 mmol g-1 @ 154 m2 g-1). These results, unique to MgO(111), suggest intrinsic differences in the effects of sintering on basic site retention. Spectroscopic and computational investigations provided a new structure-activity insight: the importance of high-temperature activation to unleash the capacity of the polar (111) facet of MgO. In summary, we present the first example of a faceted sorbent for carbon capture and challenge the assumption that sintering is necessarily a negative process; here we leverage high-temperature conditions for facet-dependent surface activation.
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Affiliation(s)
- Greg A Mutch
- School of Engineering , Newcastle University , Newcastle upon Tyne NE1 7RU , United Kingdom.,School of Engineering , University of Aberdeen , Aberdeen AB24 3FX , United Kingdom
| | - Sarah Shulda
- Department of Chemistry and Geochemistry , Colorado School of Mines , Golden , Colorado 80401 , United States
| | - Alan J McCue
- School of Engineering , University of Aberdeen , Aberdeen AB24 3FX , United Kingdom
| | - Martin J Menart
- Department of Chemistry and Geochemistry , Colorado School of Mines , Golden , Colorado 80401 , United States
| | - Cristian V Ciobanu
- Department of Mechanical Engineering and Materials Science Program , Colorado School of Mines , Golden , Colorado 80401 , United States
| | - Chilan Ngo
- Department of Chemistry and Geochemistry , Colorado School of Mines , Golden , Colorado 80401 , United States
| | - James A Anderson
- School of Engineering , University of Aberdeen , Aberdeen AB24 3FX , United Kingdom
| | - Ryan M Richards
- Department of Chemistry and Geochemistry , Colorado School of Mines , Golden , Colorado 80401 , United States
| | - David Vega-Maza
- School of Engineering , University of Aberdeen , Aberdeen AB24 3FX , United Kingdom
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21
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Hoffman AS, Debefve LM, Zhang S, Perez-Aguilar JE, Conley ET, Justl KR, Arslan I, Dixon DA, Gates BC. Beating Heterogeneity of Single-Site Catalysts: MgO-Supported Iridium Complexes. ACS Catal 2018. [DOI: 10.1021/acscatal.8b00143] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Adam S. Hoffman
- Department of Chemical Engineering, University of California—Davis, Davis, California 95616, United States
| | - Louise M. Debefve
- Department of Chemical Engineering, University of California—Davis, Davis, California 95616, United States
| | - Shengjie Zhang
- Department of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487, United States
| | - Jorge E. Perez-Aguilar
- Department of Chemical Engineering, University of California—Davis, Davis, California 95616, United States
| | - Edward T. Conley
- Department of Chemical Engineering, University of California—Davis, Davis, California 95616, United States
- Department of Materials Science and Engineering, University of California—Davis, Davis, California 95616, United States
| | - Kimberly R. Justl
- Department of Chemical Engineering, University of California—Davis, Davis, California 95616, United States
- Department of Materials Science and Engineering, University of California—Davis, Davis, California 95616, United States
| | - Ilke Arslan
- Fundamental and Computational Sciences Directorate, Institute for Integrated Catalysis and Environmental Molecular Science Laboratory, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, United States
| | - David A. Dixon
- Department of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487, United States
| | - Bruce C. Gates
- Department of Chemical Engineering, University of California—Davis, Davis, California 95616, United States
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22
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Mohammadi L, Bazrafshan E, Noroozifar M, Ansari-Moghaddam A. Application of Heterogeneous Catalytic Ozonation Process with Magnesium Oxide Nanoparticles for Toluene Degradation in Aqueous Environments. HEALTH SCOPE 2016. [DOI: 10.17795/jhealthscope-40439] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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23
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Christ JM, Ngo C, Batson T, Cadigan CA, Tong J, Richards RM, O'Hayre R, Pylypenko S. Synthesis of high surface area CaxLa(1−x)Al(1−x)MnxO(3−δ) perovskite oxides for oxygen reduction electrocatalysis in alkaline media. Catal Sci Technol 2016. [DOI: 10.1039/c6cy01497f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Performance tradeoffs related to surface area, compositional homogeneity at the oxide surface, and oxygen reduction reaction activity are discussed for perovskite oxide type catalysts synthesized using solid state reaction, hybrid sol–gel, and aerogel synthesis techniques.
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Affiliation(s)
| | - Chilan Ngo
- Department of Chemistry
- Colorado School of Mines
- Golden
- USA
| | - Tim Batson
- Department of Chemistry
- Colorado School of Mines
- Golden
- USA
| | | | - Jianhua Tong
- Department of Metallurgical and Materials Engineering
- Colorado School of Mines
- Golden
- USA
| | | | - Ryan O'Hayre
- Department of Metallurgical and Materials Engineering
- Colorado School of Mines
- Golden
- USA
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24
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Schneider J, Kollhoff F, Bernardi J, Kaftan A, Libuda J, Berger T, Laurin M, Diwald O. Porphyrin Metalation at the MgO Nanocube/Toluene Interface. ACS APPLIED MATERIALS & INTERFACES 2015; 7:22962-22969. [PMID: 26434978 DOI: 10.1021/acsami.5b08123] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Molecular insights into porphyrin adsorption on nanostructured metal oxide surfaces and associated ion exchange reactions are key to the development of functional hybrids for energy conversion, sensing, and light emission devices. Here we investigated the adsorption of tetraphenyl-porphyrin (2HTPP) from toluene solution on two types of MgO powder. We compare MgO nanocubes with an average size d < 10 nm and MgO cubes with 10 nm ≤ d ≤ 1000 nm. Using molecular spectroscopy techniques such as UV/vis transmission and diffuse reflectance (DR), photoluminescence (PL), and diffuse reflectance infrared Fourier-transform (DRIFT) spectroscopy in combination with structural characterization techniques (powder X-ray diffraction and transmission electron microscopy, TEM), we identified a new room temperature metalation reaction that converts 2HTPP into magnesium tetraphenyl-porphyrin (MgTPP). Mg(2+) uptake from the MgO nanocube surfaces and the concomitant protonation of the oxide surface level off at a concentration that corresponds to roughly one monolayer equivalent adsorbed on the MgO nanocubes. Larger MgO cubes, in contrast, show suppressed exchange, and only traces of MgTPP can be detected by photoluminescence.
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Affiliation(s)
- Johannes Schneider
- Department of Materials Science and Physics, Paris Lodron University of Salzburg , Hellbrunnerstrasse 34/III, A-5020 Salzburg, Austria
| | - Fabian Kollhoff
- Lehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg , Egerlandstraße 3, 91058 Erlangen, Germany
| | - Johannes Bernardi
- University Service Center for Transmission Electron Microscopy, Vienna University of Technology , Wiedner Hauptstrasse 8-10, A-1040 Vienna, Austria
| | - Andre Kaftan
- Lehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg , Egerlandstraße 3, 91058 Erlangen, Germany
| | - Jörg Libuda
- Lehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg , Egerlandstraße 3, 91058 Erlangen, Germany
- Erlangen Catalysis Resource Center and Interdisciplinary Center for Interface-Controlled Processes, Friedrich-Alexander-Universität Erlangen-Nürnberg , 91058 Erlangen, Germany
| | - Thomas Berger
- Department of Materials Science and Physics, Paris Lodron University of Salzburg , Hellbrunnerstrasse 34/III, A-5020 Salzburg, Austria
| | - Mathias Laurin
- Lehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg , Egerlandstraße 3, 91058 Erlangen, Germany
| | - Oliver Diwald
- Department of Materials Science and Physics, Paris Lodron University of Salzburg , Hellbrunnerstrasse 34/III, A-5020 Salzburg, Austria
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25
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Smerieri M, Pal J, Savio L, Vattuone L, Ferrando R, Tosoni S, Giordano L, Pacchioni G, Rocca M. Spontaneous Oxidation of Ni Nanoclusters on MgO Monolayers Induced by Segregation of Interfacial Oxygen. J Phys Chem Lett 2015; 6:3104-3109. [PMID: 26267209 DOI: 10.1021/acs.jpclett.5b01362] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report the study of Ni nanoclusters deposited on MgO/Ag(100) ultrathin films (one monolayer) at T = 200 K. We show by STM analysis and DFT calculations that in the limit of low Ni coverage the formation of nanoclusters of four to six atoms occurs and that these aggregates are flat rather than 3D, as expected for Ni tetramers, pentamers, or hexamers. Both the shape of the clusters and the interatomic distance between neighboring Ni atoms are indicative that the nanoparticles do not consist of pure metal atoms but that a NiyOx structure has formed thanks to the availability of atomic oxygen accumulated at the MgO/Ag interface, with Ni clusters acting as oxygen pumps. Besides being of relevance in view of the use of metal nanoclusters in catalysis and other applications, this finding gives a further proof of the peculiar behavior of ultrathin oxide films.
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Affiliation(s)
- M Smerieri
- †IMEM-CNR, U.O.S. Genova, Via Dodecaneso 33, 16146 Genova, Italy
| | - J Pal
- †IMEM-CNR, U.O.S. Genova, Via Dodecaneso 33, 16146 Genova, Italy
- ‡Dipartimento di Fisica, Università di Genova, Via Dodecaneso 33, 16146 Genova, Italy
| | - L Savio
- †IMEM-CNR, U.O.S. Genova, Via Dodecaneso 33, 16146 Genova, Italy
| | - L Vattuone
- †IMEM-CNR, U.O.S. Genova, Via Dodecaneso 33, 16146 Genova, Italy
- ‡Dipartimento di Fisica, Università di Genova, Via Dodecaneso 33, 16146 Genova, Italy
| | - R Ferrando
- †IMEM-CNR, U.O.S. Genova, Via Dodecaneso 33, 16146 Genova, Italy
- §Dipartimento di Chimica e Chimica Industriale, Università di Genova, Via Dodecaneso 31, 16146 Genova, Italy
| | - S Tosoni
- ∥Dipartimento di Scienza dei Materiali, Università Milano Bicocca, via R. Cozzi 55, 20125 Milano, Italy
| | - L Giordano
- ∥Dipartimento di Scienza dei Materiali, Università Milano Bicocca, via R. Cozzi 55, 20125 Milano, Italy
| | - G Pacchioni
- ∥Dipartimento di Scienza dei Materiali, Università Milano Bicocca, via R. Cozzi 55, 20125 Milano, Italy
| | - M Rocca
- †IMEM-CNR, U.O.S. Genova, Via Dodecaneso 33, 16146 Genova, Italy
- ‡Dipartimento di Fisica, Università di Genova, Via Dodecaneso 33, 16146 Genova, Italy
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26
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Baumann SO, Schneider J, Sternig A, Thomele D, Stankic S, Berger T, Grönbeck H, Diwald O. Size effects in MgO cube dissolution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:2770-6. [PMID: 25668706 DOI: 10.1021/la504651v] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Stability parameters and dissolution behavior of engineered nanomaterials in aqueous systems are critical to assess their functionality and fate under environmental conditions. Using scanning electron microscopy, transmission electron microscopy, and X-ray diffraction, we investigated the stability of cubic MgO particles in water. MgO dissolution proceeding via water dissociation at the oxide surface, disintegration of Mg(2+)-O(2-) surface elements, and their subsequent solvation ultimately leads to precipitation of Mg(OH)2 nanosheets. At a pH ≥ 10, MgO nanocubes with a size distribution below 10 nm quantitatively dissolve within few minutes and convert into Mg(OH)2 nanosheets. This effect is different from MgO cubes originating from magnesium combustion in air. With a size distribution in the range 10 nm ≤ d ≤ 1000 nm they dissolve with a significantly smaller dissolution rate in water. On these particles water induced etching generates (110) faces which, above a certain face area, dissolve at a rate equal to that of (100) planes.1 The delayed solubility of microcrystalline MgO is attributed to surface hydroxide induced self-inhibition effects occurring at the (100) and (110) microplanes. The present work underlines the importance of morphology evolution and surface faceting of engineered nanomaterials particles during their dissolution.
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Affiliation(s)
- Stefan O Baumann
- Institute of Particle Technology, Friedrich-Alexander Universität Erlangen-Nürnberg , Cauerstrasse 4, 91058 Erlangen, Germany
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27
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Pascanu V, Hansen PR, Bermejo Gómez A, Ayats C, Platero-Prats AE, Johansson MJ, Pericàs MÀ, Martín-Matute B. Highly functionalized biaryls via Suzuki-Miyaura cross-coupling catalyzed by Pd@MOF under batch and continuous flow regimes. CHEMSUSCHEM 2015; 8:123-130. [PMID: 25421122 DOI: 10.1002/cssc.201402858] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2014] [Indexed: 06/04/2023]
Abstract
A diverse set of more than 40 highly functionalized biaryls was synthesized successfully through the Suzuki-Miyaura cross-coupling reaction catalyzed by Pd nanoparticles supported in a functionalized mesoporous MOF (8 wt % Pd@MIL-101(Cr)-NH2 ). This could be achieved under some of the mildest conditions reported to date and a strong control over the leaching of metallic species could be maintained, despite the presence of diverse functional groups and/or several heteroatoms. Some of the targeted molecules are important intermediates in the synthesis of pharmaceuticals and we clearly exemplify the versatility of this catalytic system, which affords better yields than currently existing commercial procedures. Most importantly, Pd@MIL-101-NH2 was packed in a micro-flow reactor, which represents the first report of metallic nanoparticles supported on MOFs employed in flow chemistry for catalytic applications. A small library of 11 isolated compounds was created in a continuous experiment without replacing the catalyst, demonstrating the potential of the catalyst for large-scale applications.
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Affiliation(s)
- Vlad Pascanu
- Department of Organic Chemistry and Berzelii Center EXSELENT, Arrhenius Laboratory, Stockholm University, Stockholm, 106 91 (Sweden)
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28
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29
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Lin F, Markus IM, Nordlund D, Weng TC, Asta MD, Xin HL, Doeff MM. Surface reconstruction and chemical evolution of stoichiometric layered cathode materials for lithium-ion batteries. Nat Commun 2014. [DOI: 10.1038/ncomms4529 (2014)] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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30
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Surface reconstruction and chemical evolution of stoichiometric layered cathode materials for lithium-ion batteries. Nat Commun 2014; 5:3529. [PMID: 24670975 DOI: 10.1038/ncomms4529] [Citation(s) in RCA: 418] [Impact Index Per Article: 41.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2013] [Accepted: 02/28/2014] [Indexed: 12/23/2022] Open
Abstract
The present study sheds light on the long-standing challenges associated with high-voltage operation of LiNi(x)Mn(x)Co(1-2x)O2 cathode materials for lithium-ion batteries. Using correlated ensemble-averaged high-throughput X-ray absorption spectroscopy and spatially resolved electron microscopy and spectroscopy, here we report structural reconstruction (formation of a surface reduced layer, to transition) and chemical evolution (formation of a surface reaction layer) at the surface of LiNi(x)Mn(x)Co(1-2x)O2 particles. These are primarily responsible for the prevailing capacity fading and impedance buildup under high-voltage cycling conditions, as well as the first-cycle coulombic inefficiency. It was found that the surface reconstruction exhibits a strong anisotropic characteristic, which predominantly occurs along lithium diffusion channels. Furthermore, the surface reaction layer is composed of lithium fluoride embedded in a complex organic matrix. This work sets a refined example for the study of surface reconstruction and chemical evolution in battery materials using combined diagnostic tools at complementary length scales.
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31
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Siedl N, Koller D, Sternig AK, Thomele D, Diwald O. Photoluminescence quenching in compressed MgO nanoparticle systems. Phys Chem Chem Phys 2014; 16:8339-45. [DOI: 10.1039/c3cp54582b] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Cornu D, Petitjean H, Costentin G, Guesmi H, Krafft JM, Lauron-Pernot H. Influence of natural adsorbates of magnesium oxide on its reactivity in basic catalysis. Phys Chem Chem Phys 2013; 15:19870-8. [DOI: 10.1039/c3cp53624f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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