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Prenesti G, Azzato G, Cassano K, De Marco G, Caravella A. Assessment of effectiveness factor in porous catalysts under non-symmetric external conditions of concentration. INTERNATIONAL JOURNAL OF CHEMICAL REACTOR ENGINEERING 2022. [DOI: 10.1515/ijcre-2022-0143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
the present paper, the effectiveness factor of porous catalytic particles is evaluated in the absence of boundary conditions symmetry over the external surface by computational fluid dynamic (CFD) techniques. The first-order kinetics of decane oxidation, already evaluated experimentally, is taken as a representative reaction. Our study arises from the fact that, in the open literature, the effectiveness factor is usually calculated considering conditions of symmetry of concentration field around particles. However, depending on the fluid dynamics of the system, such conditions are not always established and, thus, our work aims at studying for the first time the behaviour of particle catalysts with non-uniform concentration fields over the surface. In particular, the effectiveness factor of the particles in a catalytic layer is calculated in the absence of symmetry by changing several parameters (temperature, tortuosity and mean pore diameter of particle) using two different methods, named Sphere-by-Sphere (SbS) and Equisized-Volume (EV), respectively. The results of these two methods are then compared to the theoretical one obtained in the presence of spherical symmetry. As a main result, we found that, for moderately low values of Thiele modulus (<1.3 ca.), the analytical expression of the effectiveness factor obtained under spherical symmetry can be also applied in non-symmetric conditions. On the contrary, this cannot be done for higher values of Thiele modulus, for which we propose an empirical correlation of the effectiveness factor based on a corrected Thiele modulus. The efficacy of our approach is stated by the fact that pseudo-homogeneous-mode simulations of the heterogeneous system show results that match very well those obtained in heterogeneous mode, with an important reduction of calculation time and memory. The presented methodology can be also applied to n-order kinetics.
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Affiliation(s)
- Giuseppe Prenesti
- Department of Computer Engineering, Modelling, Electronics and Systems Engineering (DIMES) , University of Calabria , Via P. Bucci, Cubo 42C, 87036 (CS) , Rende , Italy
| | - Giulia Azzato
- Department of Computer Engineering, Modelling, Electronics and Systems Engineering (DIMES) , University of Calabria , Via P. Bucci, Cubo 42C, 87036 (CS) , Rende , Italy
| | - Katia Cassano
- Department of Computer Engineering, Modelling, Electronics and Systems Engineering (DIMES) , University of Calabria , Via P. Bucci, Cubo 42C, 87036 (CS) , Rende , Italy
| | - Giuseppe De Marco
- Information Technology Center (ICT) , University of Calabria , Via P. Bucci, Cubo 22B, 87036 (CS) , Rende , Italy
| | - Alessio Caravella
- Department of Computer Engineering, Modelling, Electronics and Systems Engineering (DIMES) , University of Calabria , Via P. Bucci, Cubo 42C, 87036 (CS) , Rende , Italy
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Witt PM, Hickman DA. Fluidized‐Bed Reactor Scale‐Up: Reaction Kinetics Required. AIChE J 2022. [DOI: 10.1002/aic.17803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Paul M. Witt
- Core Research and Development, The Dow Chemical Company Midland MI
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Qian H, Tian H, Yang G, Yang G, Li L, Zhang F, Zhou Z, Huang W, Chen Y, Zhang Z. Microinterface Intensification in Hydrogenation and Air Oxidation Processes. Chin J Chem Eng 2022. [DOI: 10.1016/j.cjche.2022.05.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Meshalkin VP, Kulov NN, Panchenko SV, Dli MI, Bobkov VI, Chernovalova MV. Hydrodynamic Aspects of Heterogeneous Reduction and Dissolution Reactions with the Evolution of Gas Bubbles. THEORETICAL FOUNDATIONS OF CHEMICAL ENGINEERING 2021. [DOI: 10.1134/s004057952104028x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Salierno G, Maestri M, Picabea J, Cassanello M, De Blasio C, Cardona MA, Hojman D, Somacal H. Industrially relevant Radioactive Particle Tracking study on the motion of adsorbent granules suspended in a pilot-scale water–air three-phase fluidized bed. Chem Eng Res Des 2021. [DOI: 10.1016/j.cherd.2021.07.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Chen G, Zhu X, Liao Q, Chen R, Ye D, Liu M, Wang K. A novel structured foam microreactor with controllable gas and liquid flow paths: Hydrodynamics and nitrobenzene conversion. Chem Eng Sci 2021. [DOI: 10.1016/j.ces.2020.116004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Wang Y, Tian F, Guo P, Fu D, Heeres HJ, Tang T, Yuan H, Wang B, Li J. Catalytic liquefaction of sewage sludge to small molecular weight chemicals. Sci Rep 2020; 10:18929. [PMID: 33144686 PMCID: PMC7609695 DOI: 10.1038/s41598-020-75980-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Accepted: 10/19/2020] [Indexed: 11/09/2022] Open
Abstract
The catalytic hydrotreatment of sewage sludge, the wet solid byproducts from wastewater treatment plants, using supported Ir, Pt, Pd, Ru catalysts had been investigated with different solvent conditions. Reactions were carried out in a batch set-up at elevated temperatures (400 °C) using a hydrogen donor (formic acid (FA) in isopropanol (IPA) or hydrogen gas), with sewage sludge obtained from different sampling places. Sewage sludge conversions of up to 83.72% were achieved using Pt/C, whereas the performance for the others catalysts is different and solvent had a strong effect on the conversion rate and product constitution. The sewage sludge oils were characterised using a range of analytical techniques (GC, GC-MS, GCxGC, GPC) and were shown to consist of monomers, mainly alkanes and higher oligomers.
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Affiliation(s)
- Yuehu Wang
- College of Resources and Environmental Engineering, Guizhou University, Guiyang, 550025, China. .,Observation and Research Station for Guizhou Karst Environmental Ecosystems, Guiyang, 550025, China.
| | - Feihong Tian
- College of Resources and Environmental Engineering, Guizhou University, Guiyang, 550025, China.,Observation and Research Station for Guizhou Karst Environmental Ecosystems, Guiyang, 550025, China
| | - Peimei Guo
- College of Resources and Environmental Engineering, Guizhou University, Guiyang, 550025, China.,Observation and Research Station for Guizhou Karst Environmental Ecosystems, Guiyang, 550025, China
| | - Dazhen Fu
- College of Resources and Environmental Engineering, Guizhou University, Guiyang, 550025, China.,Observation and Research Station for Guizhou Karst Environmental Ecosystems, Guiyang, 550025, China
| | - Hero Jan Heeres
- Chemical Engineering Department, ENTEG, University of Groningen, Nijenborg 4, 9747 AG, Groningen, The Netherlands
| | - Taotao Tang
- College of Resources and Environmental Engineering, Guizhou University, Guiyang, 550025, China.,Observation and Research Station for Guizhou Karst Environmental Ecosystems, Guiyang, 550025, China
| | - Huayu Yuan
- College of Resources and Environmental Engineering, Guizhou University, Guiyang, 550025, China.,Observation and Research Station for Guizhou Karst Environmental Ecosystems, Guiyang, 550025, China
| | - Bing Wang
- College of Resources and Environmental Engineering, Guizhou University, Guiyang, 550025, China.,Observation and Research Station for Guizhou Karst Environmental Ecosystems, Guiyang, 550025, China
| | - Jiang Li
- College of Resources and Environmental Engineering, Guizhou University, Guiyang, 550025, China.,Observation and Research Station for Guizhou Karst Environmental Ecosystems, Guiyang, 550025, China
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Meshalkin VP, Panchenko SV, Dli MI, Bobkov VI, Chernovalova MV. Mechanism of the Intensification of a Heterogeneous Reduction Reaction with the Liberation of Gas Bubbles. THEORETICAL FOUNDATIONS OF CHEMICAL ENGINEERING 2020. [DOI: 10.1134/s0040579520020104] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Affiliation(s)
- Andrea Rathgeb
- RWTH Aachen UniversityAachener Verfahrenstechnik, Lehrstuhl für Fluidverfahrenstechnik Forckenbeckstraße 51 52074 Aachen Germany
| | - Andreas Palmtag
- RWTH Aachen UniversityAachener Verfahrenstechnik, Lehrstuhl für Fluidverfahrenstechnik Forckenbeckstraße 51 52074 Aachen Germany
| | - Sebastian Kaminski
- RWTH Aachen UniversityAachener Verfahrenstechnik, Lehrstuhl für Fluidverfahrenstechnik Forckenbeckstraße 51 52074 Aachen Germany
| | - Andreas Jupke
- RWTH Aachen UniversityAachener Verfahrenstechnik, Lehrstuhl für Fluidverfahrenstechnik Forckenbeckstraße 51 52074 Aachen Germany
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Navarro-Brull FJ, Gómez R. Modeling Pore-Scale Two-Phase Flow: How to Avoid Gas-Channeling Phenomena in Micropacked-Bed Reactors via Catalyst Wettability Modification. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.7b02493] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Francisco J. Navarro-Brull
- Institut Universitari d’Electroquímica
i Departament de Química Física, Universitat d’Alacant, Apartat 99, E-03080 Alicante, Spain
| | - Roberto Gómez
- Institut Universitari d’Electroquímica
i Departament de Química Física, Universitat d’Alacant, Apartat 99, E-03080 Alicante, Spain
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Gruber P, Marques MPC, O'Sullivan B, Baganz F, Wohlgemuth R, Szita N. Conscious coupling: The challenges and opportunities of cascading enzymatic microreactors. Biotechnol J 2017; 12. [DOI: 10.1002/biot.201700030] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Revised: 03/24/2017] [Accepted: 04/05/2017] [Indexed: 12/14/2022]
Affiliation(s)
- Pia Gruber
- Department of Biochemical Engineering; University College London; WC1H 0AH United Kingdom
| | - Marco P. C. Marques
- Department of Biochemical Engineering; University College London; WC1H 0AH United Kingdom
| | - Brian O'Sullivan
- Department of Biochemical Engineering; University College London; WC1H 0AH United Kingdom
| | - Frank Baganz
- Department of Biochemical Engineering; University College London; WC1H 0AH United Kingdom
| | | | - Nicolas Szita
- Department of Biochemical Engineering; University College London; WC1H 0AH United Kingdom
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