1
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Wang C, Xu W, Qin Z, Liu X, Mintova S. Low-temperature synthesis of α-alumina nanosheets on microfibrous-structured Al-fibers for Pd-catalyzed CO oxidative coupling to dimethyl oxalate. Catal Today 2020. [DOI: 10.1016/j.cattod.2019.03.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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2
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Kočí P, Isoz M, Plachá M, Arvajová A, Václavík M, Svoboda M, Price E, Novák V, Thompsett D. 3D reconstruction and pore-scale modeling of coated catalytic filters for automotive exhaust gas aftertreatment. Catal Today 2019. [DOI: 10.1016/j.cattod.2017.12.025] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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3
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Florén CR, Carlsson PA, Creaser D, Grönbeck H, Skoglundh M. Multiscale reactor modelling of total pressure effects on complete methane oxidation over Pd/Al2O3. Catal Sci Technol 2019. [DOI: 10.1039/c8cy02461h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A two-dimensional multiscale model is developed to describe the complete methane oxidation reaction for simulated exhaust gas conditions.
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Affiliation(s)
- Carl-Robert Florén
- Competence Centre for Catalysis
- Department of Chemistry and Chemical Engineering
- Chalmers University of Technology
- SE-41296 Göteborg
- Sweden
| | - Per-Anders Carlsson
- Competence Centre for Catalysis
- Department of Chemistry and Chemical Engineering
- Chalmers University of Technology
- SE-41296 Göteborg
- Sweden
| | - Derek Creaser
- Competence Centre for Catalysis
- Department of Chemistry and Chemical Engineering
- Chalmers University of Technology
- SE-41296 Göteborg
- Sweden
| | - Henrik Grönbeck
- Competence Centre for Catalysis
- Department of Physics
- Chalmers University of Technology
- SE-41296 Göteborg
- Sweden
| | - Magnus Skoglundh
- Competence Centre for Catalysis
- Department of Chemistry and Chemical Engineering
- Chalmers University of Technology
- SE-41296 Göteborg
- Sweden
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4
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Dhillon PS, Harold MP, Wang D, Kumar A, Joshi S. Hydrothermal aging of Pt/Al2O3 monolith: Washcoat morphology degradation effects studied using ammonia and propylene oxidation. Catal Today 2019. [DOI: 10.1016/j.cattod.2017.12.023] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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5
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Demonstration of the Use of 3D X-ray Tomography to Compare the Uniformity of Catalyst Coatings in Open-Cell Foams. CHEMENGINEERING 2018. [DOI: 10.3390/chemengineering2040052] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Coating open-cell foams by a catalytic layer is a necessary step to obtain structured catalytic foam reactors. The dip-coating method, consisting of immersing the foam in a suspension or in a sol-gel, is generally used to obtain the coating. The excess of liquid has to be evacuated from the foam to obtain a thin layer. Different methods to remove this excess of liquid have been investigated in the present work. The objective was to show that 3D X-ray tomography coupled to image analysis could be a tool to discriminate the methods by analysing the spatial localisation of the catalyst layer throughout the whole foam samples. A simple blowing by air in every direction seems to not be appropriate to obtain uniform coatings.
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6
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Navalho JEP, Pereira JMC, Pereira JCF. Multiscale modeling of methane catalytic partial oxidation: From the mesopore to the full-scale reactor operation. AIChE J 2017. [DOI: 10.1002/aic.15945] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Jorge E. P. Navalho
- LAETA, IDMEC, Instituto Superior Técnico, Universidade de Lisboa; Av. Rovisco Pais 1 1049-001 Lisbon Portugal
| | - José M. C. Pereira
- LAETA, IDMEC, Instituto Superior Técnico, Universidade de Lisboa; Av. Rovisco Pais 1 1049-001 Lisbon Portugal
| | - José C. F. Pereira
- LAETA, IDMEC, Instituto Superior Técnico, Universidade de Lisboa; Av. Rovisco Pais 1 1049-001 Lisbon Portugal
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7
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CFD study on thermal transport in open-cell metal foams with and without a washcoat: Effective thermal conductivity and gas-solid interfacial heat transfer. Chem Eng Sci 2017. [DOI: 10.1016/j.ces.2016.12.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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8
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Wang C, Ding J, Zhao G, Deng T, Liu Y, Lu Y. Microfibrous-Structured Pd/AlOOH/Al-Fiber for CO Coupling to Dimethyl Oxalate: Effect of Morphology of AlOOH Nanosheet Endogenously Grown on Al-Fiber. ACS APPLIED MATERIALS & INTERFACES 2017; 9:9795-9804. [PMID: 28245100 DOI: 10.1021/acsami.7b00889] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report a green, template-free, and general one-pot method of endogenous growth of free-standing boehmite (AlOOH) nanosheets on a 3D-network 60 μm-Al-fiber felt through water-only hydrothermal oxidation reaction between Al metal and H2O (2Al + 4H2O → 2AlOOH + 3H2). Content and morphology of AlOOH nanosheets can be finely tuned by adjusting the hydrothermal oxidation time length and temperature. Palladium is highly dispersed on such AlOOH endogenously formed on Al-fiber felt via incipient wetness impregnation method and as-obtained Pd/AlOOH/Al-fiber catalysts are checked in the CO coupling to dimethyl oxalate (DMO) reaction. Interestingly, Pd dispersion is very sensitive to the thickness (26-68 nm) of AlOOH nanosheet, and therefore the conversion shows strong AlOOH-nanosheet-thickness dependence whereas the intrinsic activity (TOF) is AlOOH-nanosheet-thickness independence. The most promising structured catalyst is the one using a microfibrous-structured composite with the thinnest AlOOH nanosheet (26 nm) to support a small amount of Pd of only 0.26 wt %. This catalyst, with high thermal-conductivity and satisfying structural robustness, delivers 67% CO conversion and 96% DMO selectivity at 150 °C using a feed of CH3ONO/CO/N2 (1/1.4/7.6, vol) and a gas hourly space velocity of 3000 L kg-1 h-1, and particularly, is very stable for at least 150 h without deactivation sign.
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Affiliation(s)
- Chunzheng Wang
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University , Shanghai 200062, China
| | - Jia Ding
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University , Shanghai 200062, China
| | - Guofeng Zhao
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University , Shanghai 200062, China
| | - Tao Deng
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University , Shanghai 200062, China
| | - Ye Liu
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University , Shanghai 200062, China
| | - Yong Lu
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University , Shanghai 200062, China
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9
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Václavík M, Novák V, Březina J, Kočí P, Gregori G, Thompsett D. Effect of diffusion limitation on the performance of multi-layer oxidation and lean NO x trap catalysts. Catal Today 2016. [DOI: 10.1016/j.cattod.2016.03.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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10
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Mahmoudizadeh M, Irankhah A, Irankhah R. A performance study on the electrocoating process with a CuZnAl nanocatalyst for a methanol steam reformer: the effect of time and voltage. RSC Adv 2016. [DOI: 10.1039/c5ra18371e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A metal microreactor combined with the EPD technique is an alternative strategy to improve catalyst performance by optimization of the physical coating parameters.
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Affiliation(s)
- Masoud Mahmoudizadeh
- Hydrogen and Fuel Cell Research Laboratory
- Department of Chemical Engineering
- Faculty of Engineering
- University of Kashan
- Kashan
| | - Abdullah Irankhah
- Hydrogen and Fuel Cell Research Laboratory
- Department of Chemical Engineering
- Faculty of Engineering
- University of Kashan
- Kashan
| | - Reza Irankhah
- Department of Ceramic
- Materials and Energy Research Center
- Tehran
- Iran
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11
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Ye G, Duan X, Zhu K, Zhou X, Coppens MO, Yuan W. Optimizing spatial pore-size and porosity distributions of adsorbents for enhanced adsorption and desorption performance. Chem Eng Sci 2015. [DOI: 10.1016/j.ces.2015.04.024] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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12
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Understanding the gas transport in porous catalyst layers by using digital reconstruction techniques. Curr Opin Chem Eng 2015. [DOI: 10.1016/j.coche.2015.07.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Gebäck T, Marucci M, Boissier C, Arnehed J, Heintz A. Investigation of the Effect of the Tortuous Pore Structure on Water Diffusion through a Polymer Film Using Lattice Boltzmann Simulations. J Phys Chem B 2015; 119:5220-7. [DOI: 10.1021/acs.jpcb.5b01953] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tobias Gebäck
- Department of Mathematical Sciences, Chalmers University of Technology and Gothenburg University, SE-412 96 Göteborg, Sweden
- SuMo Biomaterials, VINN Excellence Centre, Chalmers University of Technology, SE-41296 Göteborg, Sweden
| | - Mariagrazia Marucci
- AstraZeneca R&D Mölndal, SE-431 83 Mölndal, Sweden
- SuMo Biomaterials, VINN Excellence Centre, Chalmers University of Technology, SE-41296 Göteborg, Sweden
| | | | | | - Alexei Heintz
- Department of Mathematical Sciences, Chalmers University of Technology and Gothenburg University, SE-412 96 Göteborg, Sweden
- SuMo Biomaterials, VINN Excellence Centre, Chalmers University of Technology, SE-41296 Göteborg, Sweden
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14
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Hofmann G, Rochet A, Ogel E, Casapu M, Ritter S, Ogurreck M, Grunwaldt JD. Aging of a Pt/Al2O3 exhaust gas catalyst monitored by quasi in situ X-ray micro computed tomography. RSC Adv 2015. [DOI: 10.1039/c4ra14007a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Catalyst aging effects are analyzed using X-ray absorption micro-computed tomography in combination with conventional characterization methods on various length scales ranging from nm to μm to gain insight into deactivation mechanisms.
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Affiliation(s)
- Georg Hofmann
- Institute for Chemical Technology and Polymer Chemistry
- Karlsruhe Institute of Technology (KIT)
- D-76131 Karlsruhe
- Germany
| | - Amélie Rochet
- Institute for Chemical Technology and Polymer Chemistry
- Karlsruhe Institute of Technology (KIT)
- D-76131 Karlsruhe
- Germany
| | - Elen Ogel
- Institute for Chemical Technology and Polymer Chemistry
- Karlsruhe Institute of Technology (KIT)
- D-76131 Karlsruhe
- Germany
| | - Maria Casapu
- Institute for Chemical Technology and Polymer Chemistry
- Karlsruhe Institute of Technology (KIT)
- D-76131 Karlsruhe
- Germany
| | - Stephan Ritter
- Institute of Structural Physics
- Technical University Dresden (TUD)
- D-01062 Dresden
- Germany
| | - Malte Ogurreck
- Institute of Materials Research
- Helmholtz-Zentrum Geesthacht (HZG)
- D-21502 Geesthacht
- Germany
| | - Jan-Dierk Grunwaldt
- Institute for Chemical Technology and Polymer Chemistry
- Karlsruhe Institute of Technology (KIT)
- D-76131 Karlsruhe
- Germany
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