1
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Mackiewicz E, Wejrzanowski T, Adamczyk-Cieślak B, Oliver GJ. Polymer–Nickel Composite Filaments for 3D Printing of Open Porous Materials. MATERIALS 2022; 15:ma15041360. [PMID: 35207902 PMCID: PMC8876734 DOI: 10.3390/ma15041360] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Revised: 02/07/2022] [Accepted: 02/10/2022] [Indexed: 02/06/2023]
Abstract
Catalysis has been a key way of improving the efficiency-to-cost ratio of chemical and electrochemical processes. There have been recent developments in catalyst materials that enable the development of novel and more sophisticated devices that, for example, can be used in applications, such as membranes, batteries or fuel cells. Since catalytic reactions occur on the surface, most catalyst materials are based on open porous structures, which facilitates the transport of fluids (gas or liquid) and chemical (or electrochemical) specific surface activity, thus determining the overall efficiency of the device. Noble metals are typically used for low temperature catalysis, whereas lower cost materials, such as nickel, are used for catalysis at elevated temperatures. 3D printing has the potential to produce a more sophisticated fit for purpose catalyst material. This article presents the development, fabrication and performance comparison of three thermoplastic composites where PLA (polylactic acid), PVB (polyvinyl butyral) or ABS (acrylonitrile butadiene styrene) were used as the matrix, and nickel particles were used as filler with various volume fractions, from 5 to 25 vol%. The polymer–metal composites were extruded in the form of filaments and then used for 3D FDM (Fused Deposition Modeling) printing. The 3D printed composites were heat treated to remove the polymer and sinter the nickel particles. 3D printed composites were also prepared using nickel foam as a substrate to increase the final porosity and mechanical strength of the material. The result of the study demonstrates the ability of the optimized filament materials to be used in the fabrication of high open porosity (over 60%) structures that could be used in high-temperature catalysis and/or electrocatalysis.
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Affiliation(s)
- Ewelina Mackiewicz
- Division of Materials Design, Faculty of Materials Science and Engineering, Warsaw University of Technology, Woloska 141, 02-507 Warsaw, Poland;
- Correspondence: (E.M.); (T.W.)
| | - Tomasz Wejrzanowski
- Division of Materials Design, Faculty of Materials Science and Engineering, Warsaw University of Technology, Woloska 141, 02-507 Warsaw, Poland;
- Correspondence: (E.M.); (T.W.)
| | - Bogusława Adamczyk-Cieślak
- Division of Materials Design, Faculty of Materials Science and Engineering, Warsaw University of Technology, Woloska 141, 02-507 Warsaw, Poland;
| | - Graeme J. Oliver
- Department of Mechanical Engineering, Cape Peninsula University of Technology, P.O. Box 1906, Bellville 7535, South Africa;
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2
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Kumar A, Choudhary P, Kumar A, Camargo PHC, Krishnan V. Recent Advances in Plasmonic Photocatalysis Based on TiO 2 and Noble Metal Nanoparticles for Energy Conversion, Environmental Remediation, and Organic Synthesis. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2101638. [PMID: 34396695 DOI: 10.1002/smll.202101638] [Citation(s) in RCA: 76] [Impact Index Per Article: 38.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Revised: 06/06/2021] [Indexed: 05/24/2023]
Abstract
Plasmonic photocatalysis has emerged as a prominent and growing field. It enables the efficient use of sunlight as an abundant and renewable energy source to drive a myriad of chemical reactions. For instance, plasmonic photocatalysis in materials comprising TiO2 and plasmonic nanoparticles (NPs) enables effective charge carrier separation and the tuning of optical response to longer wavelength regions (visible and near infrared). In fact, TiO2 -based materials and plasmonic effects are at the forefront of heterogeneous photocatalysis, having applications in energy conversion, production of liquid fuels, wastewater treatment, nitrogen fixation, and organic synthesis. This review aims to comprehensively summarize the fundamentals and to provide the guidelines for future work in the field of TiO2 -based plasmonic photocatalysis comprising the above-mentioned applications. The concepts and state-of-the-art description of important parameters including the formation of Schottky junctions, hot electron generation and transfer, near field electromagnetic enhancement, plasmon resonance energy transfer, scattering, and photothermal heating effects have been covered in this review. Synthetic approaches and the effect of various physicochemical parameters in plasmon-mediated TiO2 -based materials on performances are discussed. It is envisioned that this review may inspire and provide insights into the rational development of the next generation of TiO2 -based plasmonic photocatalysts with target performances and enhanced selectivities.
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Affiliation(s)
- Ajay Kumar
- School of Basic Sciences and Adv. Mater. Research Center, Indian Institute of Technology Mandi, Kamand, Mandi, Himachal Pradesh, 175075, India
| | - Priyanka Choudhary
- School of Basic Sciences and Adv. Mater. Research Center, Indian Institute of Technology Mandi, Kamand, Mandi, Himachal Pradesh, 175075, India
| | - Ashish Kumar
- School of Basic Sciences and Adv. Mater. Research Center, Indian Institute of Technology Mandi, Kamand, Mandi, Himachal Pradesh, 175075, India
| | - Pedro H C Camargo
- University of Helsinki, Department of Chemistry, A.I. Virtasen aukio 1, Helsinki, Finland
| | - Venkata Krishnan
- School of Basic Sciences and Adv. Mater. Research Center, Indian Institute of Technology Mandi, Kamand, Mandi, Himachal Pradesh, 175075, India
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3
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Czelej K, Colmenares JC, Jabłczyńska K, Ćwieka K, Werner Ł, Gradoń L. Sustainable hydrogen production by plasmonic thermophotocatalysis. Catal Today 2021. [DOI: 10.1016/j.cattod.2021.02.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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4
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Ćwieka K, Czelej K, Colmenares JC, Jabłczyńska K, Werner Ł, Gradoń L. Supported Plasmonic Nanocatalysts for Hydrogen Production by Wet and Dry Photoreforming of Biomass and Biogas Derived Compounds: Recent Progress and Future Perspectives. ChemCatChem 2021. [DOI: 10.1002/cctc.202101006] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Karol Ćwieka
- Faculty of Chemical and Process Engineering Warsaw University of Technology L. Warynskiego 1 00645 Warsaw Poland
- Faculty of Materials Science and Engineering Warsaw University of Technology Woloska 141 02507 Warsaw Poland
| | - Kamil Czelej
- Department of Complex System Modeling Institute of Theoretical Physics Faculty of Physics University of Warsaw Pasteura 5 02093 Warszawa Poland
| | - Juan Carlos Colmenares
- Institute of Physical Chemistry Polish Academy of Sciences Kasprzaka 44/52 01224 Warsaw Poland
| | - Katarzyna Jabłczyńska
- Faculty of Chemical and Process Engineering Warsaw University of Technology L. Warynskiego 1 00645 Warsaw Poland
| | - Łukasz Werner
- Faculty of Chemical and Process Engineering Warsaw University of Technology L. Warynskiego 1 00645 Warsaw Poland
| | - Leon Gradoń
- Faculty of Chemical and Process Engineering Warsaw University of Technology L. Warynskiego 1 00645 Warsaw Poland
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5
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Abstract
Methyl formate is a key component for both defossilized industry and mobility. The current industrial production via carbonylation of methanol has various disadvantages such as high requirements on reactant purity and low methanol conversion rates. In addition, there is a great interest in replacing the conventional homogeneous catalyst with a heterogeneous one, among other things to improve the downstream processing. This is why new approaches for methyl formate are sought. This review summarizes promising approaches for methyl formate production using methanol as a reactant.
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6
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Wan H, Zhang L, Li Y, Meng Q, Zhang Y, Duan T. Nanoscale water spray assisted synthesis of CAs@B-TiO 2core-shell nanospheres with enhanced visible-light photocatalytic activity. NANOTECHNOLOGY 2021; 32:285601. [PMID: 33032270 DOI: 10.1088/1361-6528/abbf69] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Accepted: 10/08/2020] [Indexed: 06/11/2023]
Abstract
Increasing photoactive areas and oxygen vacancy to improve the separation and utilization of electrons and holes in a photocatalytic process are a guarantee for highly photocatalysis efficiency. In this work, we report a CAs@B-TiO2core-shell nanospheres via a nanoscale water spray assisted method to deposit of black titanium dioxide (B-TiO2) on carbon aerogel sphere (CAs) though slowly hydrolyzing of butyl titanate (e.g. TBOT) in an ethanol-water system. On this basis, furthermore, a facile one-step N2H4 · H2O treatment was used to introduces oxygen vacancies on the surface of TiO2coating layer forming black TiO2. Oxygen vacancies can extend the optical response range of the TiO2shell from the ultraviolet to the visible region, and increase conductivity and charge transport on the interface of core-shell structure. This study reveals the importance of surface oxygen vacancies for reducing band gaps and developing highly active photocatalysts under visible light.
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Affiliation(s)
- Hengcheng Wan
- National Co-Innovation Center for Nuclear Waste Disposal and Environmental Safety, Southwest University of Science and Technology, Mianyang 621010, People's Republic of China
| | - Ling Zhang
- National Co-Innovation Center for Nuclear Waste Disposal and Environmental Safety, Southwest University of Science and Technology, Mianyang 621010, People's Republic of China
| | - Yi Li
- State Key Laboratory of Environment-Friendly Energy Materials, School of National Defence Science & Technology, Southwest University of Science and Technology, Mianyang 621010, People's Republic of China
| | - Qi Meng
- Sichuan Co-Innovation Center for New Energetic Materials, Mianyang 621010, People's Republic of China
| | - Youkui Zhang
- National Co-Innovation Center for Nuclear Waste Disposal and Environmental Safety, Southwest University of Science and Technology, Mianyang 621010, People's Republic of China
| | - Tao Duan
- National Co-Innovation Center for Nuclear Waste Disposal and Environmental Safety, Southwest University of Science and Technology, Mianyang 621010, People's Republic of China
- Sichuan Co-Innovation Center for New Energetic Materials, Mianyang 621010, People's Republic of China
- State Key Laboratory of Environment-Friendly Energy Materials, School of National Defence Science & Technology, Southwest University of Science and Technology, Mianyang 621010, People's Republic of China
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He S, Liu Y, Li H, Wu Q, Ma D, Gao D, Bi J, Yang Y, Cui C. Highly Dispersed Mo Sites on Pd Nanosheets Enable Selective Ethanol-to-Acetate Conversion. ACS APPLIED MATERIALS & INTERFACES 2021; 13:13311-13318. [PMID: 33689263 DOI: 10.1021/acsami.1c01010] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The fermentation of biomass allows for the generation of major renewable ethanol biofuel that has high energy density favorable for direct alcohol fuel cells in alkaline media. However, selective conversion of ethanol to either CO2 or acetate remains a great challenge. Especially, the ethanol-to-acetate route usually demonstrates decentoxidation current density relative to the ethanol-to-CO2 route that contains strongly adsorbed poisons. This makes the total oxidation of ethanol to CO2 unnecessary. Here, we present a highly active ethanol oxidation electrocatalyst that was prepared by in situ decorating highly dispersed Mo sites on Pd nanosheets (MoOx/Pd) via a surfactant-free and facile route. We found that ∼2 atom % of Mo on Pd nanosheets increases the current density to 3.8 A mgPd-1, around 2 times more active relative to the undecorated Pd nanosheets, achieving nearly 100% faradic efficiency for the ethanol-to-acetate conversion in an alkaline electrolyte without the generation of detectable CO2, evidenced by in situ electrochemical infrared spectroscopy, nuclear magnetic resonance, and ion chromatography. The selective and CO2-free conversion offers a promising strategy through alcohol fuel cells for contributing comparable current density to power electrical equipment while for selective oxidation of biofuels to useful acetate intermediate for the chemical industry.
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Affiliation(s)
- Shenglan He
- Molecular Electrochemistry Laboratory, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, P. R. China
| | - Yue Liu
- Key Laboratory of Basic Chemistry of the State Ethnic Commission, School of Chemistry and Environment, Southwest Minzu University, Chengdu 610041, P. R. China
| | - Hongjian Li
- Molecular Electrochemistry Laboratory, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China
| | - Qianbao Wu
- Molecular Electrochemistry Laboratory, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China
| | - Dongsheng Ma
- Molecular Electrochemistry Laboratory, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China
| | - Daojiang Gao
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, P. R. China
| | - Jian Bi
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu 610066, P. R. China
| | - Yaoyue Yang
- Key Laboratory of Basic Chemistry of the State Ethnic Commission, School of Chemistry and Environment, Southwest Minzu University, Chengdu 610041, P. R. China
| | - Chunhua Cui
- Molecular Electrochemistry Laboratory, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China
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8
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Shvalagin VV, Kompanets MO, Kutsenko OS, Kuchmy SY, Skoryk MA. Photocatalytic Activity of g-C3N4 in the Partial Oxidation of Benzyl Alcohol Under Visible Light. THEOR EXP CHEM+ 2020. [DOI: 10.1007/s11237-020-09643-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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9
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Abstract
In recent years, the impending necessity to improve the quality of outdoor and indoor air has produced a constant increase of investigations in the methodologies to remove and/or to decrease the emission of volatile organic compounds (VOCs). Among the various strategies for VOC elimination, catalytic oxidation and recently photocatalytic oxidation are regarded as some of the most promising technologies for VOC total oxidation from urban and industrial waste streams. This work is focused on bimetallic supported catalysts, investigating systematically the progress and developments in the design of these materials. In particular, we highlight their advantages compared to those of their monometallic counterparts in terms of catalytic performance and physicochemical properties (catalytic stability and reusability). The formation of a synergistic effect between the two metals is the key feature of these particular catalysts. This review examines the state-of-the-art of a peculiar sector (the bimetallic systems) belonging to a wide area (i.e., the several catalysts used for VOC removal) with the aim to contribute to further increase the knowledge of the catalytic materials for VOC removal, stressing the promising potential applications of the bimetallic catalysts in the air purification.
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10
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Review on bimetallic-deposited TiO2: preparation methods, charge carrier transfer pathways and photocatalytic applications. CHEMICAL PAPERS 2019. [DOI: 10.1007/s11696-019-00995-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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11
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Characterization of Photo-catalysts: From Traditional to Advanced Approaches. Top Curr Chem (Cham) 2019; 377:24. [PMID: 31468239 DOI: 10.1007/s41061-019-0248-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2019] [Accepted: 08/16/2019] [Indexed: 02/02/2023]
Abstract
The article provides an overview of the most relevant characterization results of heterogeneous photo-catalytic materials available in the literature. First, we present a summary of the ex situ utilization of physico-chemical characterization techniques. In the majority of current works, pre and post-reaction samples are subjected to ex situ analysis using a multitechnique approach which attempts to render information about the morphological, structural, and electronic properties of relevance to interpret photoactivity. Details of the effects on physico-chemical observables of the nanostructure and the complex chemical nature (considering mono and multiphase materials with presence of several chemical elements) of typical photo-catalysts will be analyzed. Modern studies however emphasize the use of in situ tools in order to establish activity-structure links. To this end, the first point to pay attention to is to consider carefully the interaction between light and matter at the reaction cell where the characterization is carried out. Operando and spectro-kinetic methodologies will be reviewed as they would render valuable and trusting results and thus will pave the way for the future developments in photocatalysis.
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12
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He J, Han Q, Li J, Shi Z, Shi X, Niu J. Ternary supramolecular system for photocatalytic oxidation with air by consecutive photo-induced electron transfer processes. J Catal 2019. [DOI: 10.1016/j.jcat.2019.06.040] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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13
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WU JB, SHI RP, QIN ZF, LIU H, LI ZK, ZHU HQ, ZHAO YX, WANG JG. Selective oxidation of methanol to methyl formate over bimetallic Au-Pd nanoparticles supported on SiO2. ACTA ACUST UNITED AC 2019. [DOI: 10.1016/s1872-5813(19)30034-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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14
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Jia C, Wang X, Zhong W, Wang Z, Prezhdo OV, Luo Y, Jiang J. Catalytic Chemistry Predicted by a Charge Polarization Descriptor: Synergistic O 2 Activation and CO Oxidation by Au-Cu Bimetallic Clusters on TiO 2(101). ACS APPLIED MATERIALS & INTERFACES 2019; 11:9629-9640. [PMID: 30741519 DOI: 10.1021/acsami.9b00925] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The versatile properties of bimetallic nanoparticles greatly expand the range of catalyzed chemical reactions. We demonstrate that surface chemistry can be understood and predicted using a simple adsorbate-surface interaction descriptor that relates charge polarization to chemical reactivity. Our density functional theory studies of O2 activation and CO oxidation catalyzed by Au7-Cu1 bimetallic nanoparticles supported on the TiO2(101) surface demonstrate that the generated oxidized Cu atom (CuO x) can efficiently inhibit the aggregation of the active Cu sites. Moreover, because of the strong dipole-dipole interaction between the surface and the adsorbate on the oxidized Cu site, the adsorption of CO + O2/CO + O can be significantly enhanced, which can decrease the CO oxidation barriers and further improve catalytic performance. The product of the two electric dipole moments provides a parameter that allows us to predict the key catalytic properties for different adsorption sites and reaction pathways. The reported findings provide important insights into the mechanism of chemical reactivity of metallic clusters and generate a valuable principle for catalyst design.
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Affiliation(s)
| | - Xijun Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, CAS Key Laboratory of Mechanical Behavior and Design of Materials, School of Chemistry and Materials Science , University of Science and Technology of China , Hefei , Anhui 230026 , China
| | | | | | - Oleg V Prezhdo
- Department of Chemistry , University of Southern California , Los Angeles , California 90089 , United States
| | - Yi Luo
- Hefei National Laboratory for Physical Sciences at the Microscale, CAS Key Laboratory of Mechanical Behavior and Design of Materials, School of Chemistry and Materials Science , University of Science and Technology of China , Hefei , Anhui 230026 , China
| | - Jun Jiang
- Hefei National Laboratory for Physical Sciences at the Microscale, CAS Key Laboratory of Mechanical Behavior and Design of Materials, School of Chemistry and Materials Science , University of Science and Technology of China , Hefei , Anhui 230026 , China
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15
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Li C, Yang X, Gao G, Li Y, Zhang W, Chen X, Su H, Wang S, Wang Z. Copper on the inner surface of mesoporous TiO2 hollow spheres: a highly selective photocatalyst for partial oxidation of methanol to methyl formate. Catal Sci Technol 2019. [DOI: 10.1039/c9cy01595g] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
To raise the methyl formate (MF) selectivity at high methanol conversion is one of the most challenging topics for photocatalytic partial oxidation of methanol to MF.
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Affiliation(s)
- Changfu Li
- School of Chemistry and Chemical Engineering
- Inner Mongolia Key Lab of Rare Earth Materials Chemistry and Physics
- Inner Mongolia University
- Hohhot
- P. R. China
| | - Xuzhuang Yang
- School of Chemistry and Chemical Engineering
- Inner Mongolia Key Lab of Rare Earth Materials Chemistry and Physics
- Inner Mongolia University
- Hohhot
- P. R. China
| | - Guanjun Gao
- School of Chemistry and Chemical Engineering
- Inner Mongolia Key Lab of Rare Earth Materials Chemistry and Physics
- Inner Mongolia University
- Hohhot
- P. R. China
| | - Yuanyuan Li
- School of Chemistry and Chemical Engineering
- Inner Mongolia Key Lab of Rare Earth Materials Chemistry and Physics
- Inner Mongolia University
- Hohhot
- P. R. China
| | - Weida Zhang
- School of Chemistry and Chemical Engineering
- Inner Mongolia Key Lab of Rare Earth Materials Chemistry and Physics
- Inner Mongolia University
- Hohhot
- P. R. China
| | - Xuetao Chen
- School of Chemistry and Chemical Engineering
- Inner Mongolia Key Lab of Rare Earth Materials Chemistry and Physics
- Inner Mongolia University
- Hohhot
- P. R. China
| | - Haiquan Su
- School of Chemistry and Chemical Engineering
- Inner Mongolia Key Lab of Rare Earth Materials Chemistry and Physics
- Inner Mongolia University
- Hohhot
- P. R. China
| | - Sijia Wang
- School of Chemistry and Chemical Engineering
- Inner Mongolia Key Lab of Rare Earth Materials Chemistry and Physics
- Inner Mongolia University
- Hohhot
- P. R. China
| | - Zhen Wang
- School of Chemistry and Chemical Engineering
- Inner Mongolia Key Lab of Rare Earth Materials Chemistry and Physics
- Inner Mongolia University
- Hohhot
- P. R. China
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16
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Lemos de Souza M, Pereira Dos Santos D, Corio P. Localized surface plasmon resonance enhanced photocatalysis: an experimental and theoretical mechanistic investigation. RSC Adv 2018; 8:28753-28762. [PMID: 35548395 PMCID: PMC9084418 DOI: 10.1039/c8ra03919d] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Accepted: 07/29/2018] [Indexed: 01/24/2023] Open
Abstract
Titanium dioxide (TiO2) is an advantageous material in catalytic photodegradation due to its low cost, high stability, and considerably higher efficiency when compared to other semiconductors. However, the need for artificial radiation sources in the UV range is a limitation to its use in wastewater remediation. In this context, Localized Surface Plasmon Resonance (LSPR) has been shown to enhance the photoexcitation of charge carriers in the semiconductor. In the present work, the investigation of catalytic photodegradation of phenol solution under distinct excitation by UV-visible or just visible radiation, employing three TiO2 based plasmonic catalysts, was conducted. Spherical silver nanoparticles which present LSPR along the TiO2 bandgap energy and electrically insulated silver nanoparticles were employed. Gold nanoparticles, which present low energy LSPR, were also employed in order to compare the excitation efficiency. Discrete dipole approximation simulations were carried out in order to verify the electric field enhancement and penetration at the semiconductor surface of each plasmonic catalyst. The results presented here may help to shed some light with respect to the contribution of plasmonic photocatalysts and the charge transfer mechanism in catalysts containing plasmonic structures.
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Affiliation(s)
- Michele Lemos de Souza
- Department of Chemistry, Fluminense Federal University (UFF), Campus Volta Redonda RJ Brazil
- Institute of Chemistry, University of São Paulo (USP) SP Brazil
| | - Diego Pereira Dos Santos
- Institute of Chemistry, University of Campinas (UNICAMP) Campinas SP Brazil
- Institute of Chemistry, University of São Paulo (USP) SP Brazil
| | - Paola Corio
- Institute of Chemistry, University of São Paulo (USP) SP Brazil
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17
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Wang R, Li B, Xiao Y, Tao X, Su X, Dong X. Optimizing Pd and Au-Pd decorated Bi2WO6 ultrathin nanosheets for photocatalytic selective oxidation of aromatic alcohols. J Catal 2018. [DOI: 10.1016/j.jcat.2018.05.015] [Citation(s) in RCA: 79] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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18
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Stability, structural and electronic properties of ternary Pd Au Ag clusters (x + y + z = 7): A theoretical study. COMPUT THEOR CHEM 2018. [DOI: 10.1016/j.comptc.2018.03.033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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19
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Jia C, Zhong W, Deng M, Jiang J. CO oxidation on Ru-Pt bimetallic nanoclusters supported on TiO 2(101): The effect of charge polarization. J Chem Phys 2018; 148:124701. [PMID: 29604843 DOI: 10.1063/1.5021712] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Pt-based catalyst is widely used in CO oxidation, while its catalytic activity is often undermined because of the CO poisoning effect. Here, using density functional theory, we propose the use of a Ru-Pt bimetallic cluster supported on TiO2 for CO oxidation, to achieve both high activity and low CO poisoning effect. Excellent catalytic activity is obtained in a Ru1Pt7/TiO2(101) system, which is ascribed to strong electric fields induced by charge polarization between one Ru atom and its neighboring Pt atoms. Because of its lower electronegativity, the Ru atom donates electrons to neighboring Pt. This induces strong electric fields around the top-layered Ru, substantially promoting the adsorption of O2/CO + O2 and eliminating the CO poisoning effect. In addition, the charge polarization also drives the d-band center of the Ru1Pt7 cluster to up-shift to the Fermi level. For surface O2 activation/CO oxidation, the strong electric field and d-band center close to the Fermi level can promote the adsorption of O2 and CO as well as reduce the reaction barrier of the rate-determining step. Meanwhile, since O2 easily dissociates on Ru1Pt7/TiO2(101) resulting in unwanted oxidation of Ru and Pt, a CO-rich condition is necessary to protect the catalyst at high temperature.
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Affiliation(s)
- Chuanyi Jia
- Guizhou Provincial Key Laboratory of Computational Nano-Material Science, Institute of Applied Physics, Guizhou Education University, Guiyang 550018, China
| | - Wenhui Zhong
- Guizhou Provincial Key Laboratory of Computational Nano-Material Science, Institute of Applied Physics, Guizhou Education University, Guiyang 550018, China
| | - Mingsen Deng
- Guizhou Provincial Key Laboratory of Computational Nano-Material Science, Institute of Applied Physics, Guizhou Education University, Guiyang 550018, China
| | - Jun Jiang
- Guizhou Synergetic Innovation Center of Scientific Big Data for Advance Manufacturing Technology, Guizhou Education University, Guiyang 550018, China
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20
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Zhu Y, Marianov A, Xu H, Lang C, Jiang Y. Bimetallic Ag-Cu Supported on Graphitic Carbon Nitride Nanotubes for Improved Visible-Light Photocatalytic Hydrogen Production. ACS APPLIED MATERIALS & INTERFACES 2018; 10:9468-9477. [PMID: 29465987 DOI: 10.1021/acsami.8b00393] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
This work, for the first time, reports visible-light active bare graphitic carbon nitride nanotubes (C3N4 NTs) for photocatalytic hydrogen generation, even in the absence of any cocatalyst. Upon uniform dispersion of the cocatalysts, Ag-Cu nanoparticles, on the well-ordered bare C3N4 NTs, they exhibit twice the H2 evolution rate of the bare C3N4 NTs. The improved activity is attributed to their unique tubular nanostructure, strong metal-support interaction, and efficient photoinduced electron-hole separation compared to their bare and monometallic counterparts, evidenced by complementary characterization techniques. This work reveals that the H2 production rates correlate well with the oxidation potentials of the sacrificial reagents used. Triethylamine (TEA) outperforms other sacrificial reagents, including triethanolamine (TEOA) and methanol. Mechanistic studies on the role of various sacrificial reagents in photocatalytic H2 generation demonstrate that irreversible photodegradation of TEA into diethylamine and acetaldehyde via monoelectronic oxidation contributes to the improved H2 yield. Similarly, TEOA is oxidized to diethanolamine and glycolaldehyde, whereas methanol is unable to quickly capture the photoinduced holes and remains intact due to the low oxidation potential.
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Affiliation(s)
- Yuxiang Zhu
- School of Engineering , Macquarie University , Sydney , NSW 2109 , Australia
| | - Aleksei Marianov
- School of Engineering , Macquarie University , Sydney , NSW 2109 , Australia
| | - Haimei Xu
- School of Engineering , Macquarie University , Sydney , NSW 2109 , Australia
| | - Candace Lang
- School of Engineering , Macquarie University , Sydney , NSW 2109 , Australia
| | - Yijiao Jiang
- School of Engineering , Macquarie University , Sydney , NSW 2109 , Australia
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Liang H, Liu S, Zhang H, Wang X, Wang J. New insight into the selective photocatalytic oxidation of RhB through a strategy of modulating radical generation. RSC Adv 2018; 8:13625-13634. [PMID: 35542526 PMCID: PMC9079813 DOI: 10.1039/c8ra01810c] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Accepted: 03/13/2018] [Indexed: 12/16/2022] Open
Abstract
Rhodamine B (RhB) has often been used as a model pollutant, but its photocatalytic mechanism is still controversial. Herein, Ag NPs were sandwiched between CdS QDs and amorphous-TiO2 (a-TiO2) with the intent to build a CdS/Ag/a-TiO2 catalyst with highly selective oxidation activity. When rhodamine B (RhB) was used as the model organic compound, the CdS/Ag/a-TiO2 composite can not only modulate radical generation but also improve the conversion ratio of RhB to rhodamine 110 (Rh-110) to as high as 82% at 80 min during the visible-light irradiation. A series of the radical scavenging experiments revealed that CdS/Ag/a-TiO2 composites could modulate the effects of hydroxyl radicals (·OH) and superoxide anion radicals (·O2−) at different reaction stages so that the overoxidation of RhB and Rh-110 were repressed. Therefore, the transient state protection mechanism of selective oxidation of RhB was proposed to explain the reaction selectivity for Rh-110. Although the effects of both ·O2− and ·OH are important during the photocatalytic selective oxidation of RhB, it is shown that the selective oxidation of RhB would be performed when the effect of ·O2− is bigger than the ·OH, if not, RhB would be oxidized unselectively. Meanwhile, this may provide a new strategy for modulating radical generation in the photocatalysis of water phases. A new photocatalytic mechanism of RhB was proposed according to the effect of reactive radical under different light irradiation.![]()
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Affiliation(s)
- Huijun Liang
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals
- Key Laboratory of Green Chemical Media and Reactions
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Henan Normal University
| | - Shengnan Liu
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals
- Key Laboratory of Green Chemical Media and Reactions
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Henan Normal University
| | - Hucheng Zhang
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals
- Key Laboratory of Green Chemical Media and Reactions
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Henan Normal University
| | - Xiaobing Wang
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals
- Key Laboratory of Green Chemical Media and Reactions
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Henan Normal University
| | - Jianji Wang
- Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals
- Key Laboratory of Green Chemical Media and Reactions
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Henan Normal University
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