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Mastroianni L, Vajglová Z, Eränen K, Peurla M, Di Serio M, Yu. Murzin D, Russo V, Salmi T. Microreactor technology in experimental and modelling study of alcohol oxidation on nanogold. Chem Eng Sci 2022. [DOI: 10.1016/j.ces.2022.117920] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Zhukova A, Chuklina S, Maslenkova S. Study of Cu modified Zr and Al mixed oxides in ethanol conversion: The structure-catalytic activity relationship. Catal Today 2021. [DOI: 10.1016/j.cattod.2021.02.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Tang W, Yu H, Zhao T, Qing L, Xu X, Zhao S. A dynamic reaction density functional theory for interfacial reaction-diffusion coupling at nanoscale. Chem Eng Sci 2021. [DOI: 10.1016/j.ces.2021.116513] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Systematic Incorporation of Gold Nanoparticles onto Mesoporous Titanium Oxide Particles for Green Catalysts. Catalysts 2021. [DOI: 10.3390/catal11040451] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
This report describes the systematic incorporation of gold nanoparticles (AuNPs) onto mesoporous TiO2 (MPT) particles without strong attractive forces to efficiently serve as reactive and recyclable catalysts in the homocoupling of arylboronic acid in green reaction conditions. Unlike using nonporous TiO2 particles and conventional SiO2 particles as supporting materials, the employment of MPT particles significantly improves the loading efficiency of AuNPs. The incorporated AuNPs are less than 10 nm in diameter, regardless of the amount of applied gold ions, and their surfaces, free from any modifiers, act as highly reactive catalytic sites to notably improve the yields in the homocoupling reaction. The overall physical properties of the AuNPs integrated onto the MPT particles are thoroughly examined as functions of the gold content, and their catalytic functions, including the rate of reaction, activation energy, and recyclability, are also evaluated. While the rate of reaction slightly increases with the improved loading efficiency of AuNPs, the apparent activation energies do not clearly show any correlation with the size or distribution of the AuNPs under our reaction conditions. Understanding the formation of these types of composite particles and their catalytic functions could lead to the development of highly practical, quasi-homogeneous catalysts in environmentally friendly reaction conditions.
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Behravesh E, Melander MM, Wärnå J, Salmi T, Honkala K, Murzin DY. Oxidative dehydrogenation of ethanol on gold: Combination of kinetic experiments and computation approach to unravel the reaction mechanism. J Catal 2021. [DOI: 10.1016/j.jcat.2020.07.022] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Shivhare A, Hunns JA, Durndell LJ, Parlett CMA, Isaacs MA, Lee AF, Wilson K. Metal-Acid Synergy: Hydrodeoxygenation of Anisole over Pt/Al-SBA-15. CHEMSUSCHEM 2020; 13:4945-4953. [PMID: 32449298 DOI: 10.1002/cssc.202000764] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 05/02/2020] [Indexed: 06/11/2023]
Abstract
Hydrodeoxygenation (HDO) is a promising technology to upgrade fast pyrolysis bio-oils but it requires active and selective catalysts. Here we explore the synergy between the metal and acid sites in the HDO of anisole, a model pyrolysis bio-oil compound, over mono- and bi-functional Pt/(Al)-SBA-15 catalysts. Ring hydrogenation of anisole to methoxycyclohexane occurs over metal sites and is structure sensitive; it is favored over small (4 nm) Pt nanoparticles, which confer a turnover frequency (TOF) of approximately 2000 h-1 and a methoxycyclohexane selectivity of approximately 90 % at 200 °C and 20 bar H2 ; in contrast, the formation of benzene and the desired cyclohexane product appears to be structure insensitive. The introduction of acidity to the SBA-15 support promotes the demethyoxylation of the methoxycyclohexane intermediate, which increases the selectivity to cyclohexane from 15 to 92 % and the cyclohexane productivity by two orders of magnitude (from 15 to 6500 mmol gPt -1 h-1 ). Optimization of the metal-acid synergy confers an 865-fold increase in the cyclohexane production per gram of Pt and a 28-fold reduction in precious metal loading. These findings demonstrate that tuning the metal-acid synergy provides a strategy to direct complex catalytic reaction networks and minimize precious metal use in the production of bio-fuels.
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Affiliation(s)
- Atal Shivhare
- European Bioenergy Research Institute, Aston University, Birmingham, B4 7ET, UK
| | - James A Hunns
- European Bioenergy Research Institute, Aston University, Birmingham, B4 7ET, UK
| | - Lee J Durndell
- School of Geography, Earth and Environmental Sciences, University of Plymouth, Plymouth, PL4 8AA, UK
| | - Christopher M A Parlett
- Department of Chemical Engineering and Analytical Science, University of Manchester, Manchester, M13 9PL, UK
- University of Manchester at Harwell, Diamond Light Source, Harwell Science and Innovation Campus, Didcot, OX11 0DE, UK
- Spectroscopy Village, Diamond Light Source, Harwell Science and Innovation Campus, Didcot, OX11 0DE, UK
| | - Mark A Isaacs
- Department of Chemistry, University College London, London, WC1H 0AJ, UK
- HarwellXPS, Research Complex at Harwell, Rutherford Appleton Laboratories, Didcot, OX11 0FA, UK
| | - Adam F Lee
- Centre for Advanced Materials & Industrial Chemistry (CAMIC), School of Science, RMIT University, Melbourne, VIC, 3000, Australia
| | - Karen Wilson
- Centre for Advanced Materials & Industrial Chemistry (CAMIC), School of Science, RMIT University, Melbourne, VIC, 3000, Australia
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Jang W, Yun J, Ludwig L, Jang SG, Bae JY, Byun H, Kim JH. Comparative Catalytic Properties of Supported and Encapsulated Gold Nanoparticles in Homocoupling Reactions. Front Chem 2020; 8:834. [PMID: 33195039 PMCID: PMC7533535 DOI: 10.3389/fchem.2020.00834] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Accepted: 08/10/2020] [Indexed: 11/13/2022] Open
Abstract
This report describes strategies to increase the reactive surfaces of integrated gold nanoparticles (AuNPs) by employing two different types of host materials that do not possess strong electrostatic and/or covalent interactive forces. These composite particles are then utilized as highly reactive and recyclable quasi-homogeneous catalysts in a C-C bond forming reaction. The use of mesoporous TiO2 and poly(N-isopropylacrylamide), PNIPAM, particles allows for the formation of relatively small and large guest AuNPs and provides the greatly improved stability of the resulting composite particles. As these AuNPs are physically incorporated into the mesoporous TiO2 (i.e., supported AuNPs) and PNIPAM particles (i.e., encapsulated AuNPs), their surfaces are maximized to serve as highly reactive catalytic sites. Given their increased physicochemical properties (e.g., stability, dispersity, and surface area), these composite particles exhibit notably high catalytic activity, selectivity, and recyclability in the homocoupling of phenylboronic acid in water and EtOH. Although the small supported AuNPs display slightly faster reaction rates than the large encapsulated AuNPs, the apparent activation energies (Ea) of both composite particles are comparable, implying no obvious correlation with the size of guest AuNPs under the reaction conditions. Investigating the overall physical properties of various composite particles and their catalytic functions, including the reactivity, selectivity, and Ea, can lead to the development of highly practical quasi-homogeneous catalysts in green reaction conditions.
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Affiliation(s)
- Wongi Jang
- Department of Chemistry, Illinois State University, Normal, IL, United States.,Department of Chemical Engineering, Keimyung University, Daegu, South Korea.,Department of Energy Engineering, Dankook University, Cheonan, South Korea
| | - Jaehan Yun
- Department of Chemistry, Illinois State University, Normal, IL, United States.,Department of Chemical Engineering, Keimyung University, Daegu, South Korea
| | - Luke Ludwig
- Department of Chemistry, Illinois State University, Normal, IL, United States
| | - Su Guan Jang
- Department of Chemistry, Keimyung University, Daegu, South Korea
| | - Jae Young Bae
- Department of Chemistry, Keimyung University, Daegu, South Korea
| | - Hongsik Byun
- Department of Chemical Engineering, Keimyung University, Daegu, South Korea
| | - Jun-Hyun Kim
- Department of Chemistry, Illinois State University, Normal, IL, United States
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Li H, Tian J, Xiao F, Huang R, Gao S, Cui F, Wang S, Duan X. Structure-dependent catalysis of cuprous oxides in peroxymonosulfate activation via nonradical pathway with a high oxidation capacity. JOURNAL OF HAZARDOUS MATERIALS 2020; 385:121518. [PMID: 31704121 DOI: 10.1016/j.jhazmat.2019.121518] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Revised: 10/20/2019] [Accepted: 10/21/2019] [Indexed: 06/10/2023]
Abstract
Research interests have been recently thrust into the nonradical reactions in persulfate-based advanced oxidation processes (AOPs), whilst the underlying mechanism of the nonradical pathway remains ambiguous especially in metal-based AOPs systems. In this study, we investigated the reactivity of cuprous oxide (Cu2O) for activating peroxymonosulfate (PMS) to decompose diverse organic contaminants. Cu2O exhibited a strong catalytic dependence on the crystal morphology, and cubic Cu2O was more reactive than the octahedral and rhombic dodecahedral structures for catalytic degradation of bisphenol A with PMS. Chemical quenching tests, electron paramagnetic resonance (EPR), solvent exchange and selective oxidation experiment were corporately conducted to illustrate that Cu2O-catalyzed PMS did not produce free radicals or singlet oxygen. In contrast, a surface-confined metastable intermediate would be formed via outer-sphere interactions between PMS and Cu2O, which directly attacked the organic substrate. Such a reaction pathway is intrinsically distinct from the electron-shuttling regime in carbon (or noble metal)/persulfate systems via the conductive surface of the catalyst, and the outer-sphere interactions let the activated PMS demonstrate a higher oxidizing capacity toward organic contaminants. Therefore, this study dedicates to providing new insights into the copper-catalyzed AOPs and vital supplementary to the ongoing dialogue of the nonradical catalysis in persulfate-based oxidation.
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Affiliation(s)
- Huarui Li
- School of Civil Engineering and Transportation, Hebei University of Technology, Tianjin 300401, PR China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, PR China
| | - Jiayu Tian
- School of Civil Engineering and Transportation, Hebei University of Technology, Tianjin 300401, PR China.
| | - Feng Xiao
- School of Renewable Energy, North China Electric Power University, Beijing, 102206, PR China
| | - Rui Huang
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, PR China
| | - Shanshan Gao
- School of Civil Engineering and Transportation, Hebei University of Technology, Tianjin 300401, PR China
| | - Fuyi Cui
- College of Urban Construction and Environmental Engineering, Chongqing University, Chongqing 400044, PR China
| | - Shaobin Wang
- School of Chemical Engineering and Advanced Materials, The University of Adelaide, Adelaide, South Australia 5005, Australia
| | - Xiaoguang Duan
- School of Chemical Engineering and Advanced Materials, The University of Adelaide, Adelaide, South Australia 5005, Australia.
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Influence of Structure Sensitivity on Apparent Activation Energy of Parallel Heterogeneous Catalytic Reactions. Catal Letters 2019. [DOI: 10.1007/s10562-019-03075-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Abstract
Analysis of apparent activation energy is presented for different heterogeneous catalytic reactions with parallel reaction routes. In the case of kinetic coupling between catalytic cycles the activation energy in a particular route depends not only on the activation energies of the elementary steps comprising this route, but also on the frequency of the steps in a parallel route. Expressions were derived for coupling between routes through irreversible adsorption of the substrate, quasi-equilibrated binding as well as different substrate adsorption modes. Theoretical analysis of the apparent activation energy was extended for the reaction network with two routes possessing mechanistically different rate determining steps (i.e. monomolecular vs bimolecular). For structure sensitive reactions an expression for the apparent activation energy for parallel reactions was developed for cases with a continuous distribution of active centers and a cubo-octahedral representation of the metal clusters. A comparison between the theoretical analysis and experimental data on transformations of furfural to furfuryl alcohol and furan on ruthenium clusters shows applicability of the developed theoretical framework.
Graphic Abstract
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