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Jurina T, Sokač Cvetnić T, Šalić A, Benković M, Valinger D, Gajdoš Kljusurić J, Zelić B, Jurinjak Tušek A. Application of Spectroscopy Techniques for Monitoring (Bio)Catalytic Processes in Continuously Operated Microreactor Systems. Catalysts 2023. [DOI: 10.3390/catal13040690] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023] Open
Abstract
In the last twenty years, the application of microreactors in chemical and biochemical industrial processes has increased significantly. The use of microreactor systems ensures efficient process intensification due to the excellent heat and mass transfer within the microchannels. Monitoring the concentrations in the microchannels is critical for a better understanding of the physical and chemical processes occurring in micromixers and microreactors. Therefore, there is a growing interest in performing in-line and on-line analyses of chemical and/or biochemical processes. This creates tremendous opportunities for the incorporation of spectroscopic detection techniques into production and processing lines in various industries. In this work, an overview of current applications of ultraviolet–visible, infrared, Raman spectroscopy, NMR, MALDI-TOF-MS, and ESI-MS for monitoring (bio)catalytic processes in continuously operated microreactor systems is presented. The manuscript includes a description of the advantages and disadvantages of the analytical methods listed, with particular emphasis on the chemometric methods used for spectroscopic data analysis.
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Affiliation(s)
- Tamara Jurina
- Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva ul. 6, 10 000 Zagreb, Croatia
| | - Tea Sokač Cvetnić
- Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva ul. 6, 10 000 Zagreb, Croatia
| | - Anita Šalić
- Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10 000 Zagreb, Croatia
| | - Maja Benković
- Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva ul. 6, 10 000 Zagreb, Croatia
| | - Davor Valinger
- Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva ul. 6, 10 000 Zagreb, Croatia
| | - Jasenka Gajdoš Kljusurić
- Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva ul. 6, 10 000 Zagreb, Croatia
| | - Bruno Zelić
- Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10 000 Zagreb, Croatia
- Department for Packaging, Recycling and Environmental Protection, University North, Trg dr. Žarka Dolinara 1, 48 000 Koprivnica, Croatia
| | - Ana Jurinjak Tušek
- Faculty of Food Technology and Biotechnology, University of Zagreb, Pierottijeva ul. 6, 10 000 Zagreb, Croatia
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Cao E, Radhakrishnan ANP, Hasanudin RB, Gavriilidis A. Study of Liquid-Solid Mass Transfer and Hydrodynamics in Micropacked Bed with Gas-Liquid Flow. Ind Eng Chem Res 2021; 60:10489-10501. [PMID: 34349342 PMCID: PMC8323102 DOI: 10.1021/acs.iecr.1c00089] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Revised: 05/07/2021] [Accepted: 05/11/2021] [Indexed: 11/29/2022]
Abstract
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The
volumetric liquid–solid (L-S) mass transfer coefficient
under gas–liquid (G-L) two-phase flow in a silicon-chip-based
micropacked bed reactor (MPBR) was studied using the copper dissolution
method and was related to the reactor hydrodynamic behavior. Using
a high-speed camera and a robust computational image analysis method
that selectively analyzed the bed voidage around the copper particles,
the observed hydrodynamics were directly related to the L-S mass transfer
rates in the MPBR. This hydrodynamic study revealed different pulsing
structures inside the packed copper bed depending on the flow patterns
established preceding the packed bed upon increasing gas velocity.
A “liquid-dominated slug” flow regime was associated
with an upstream slug flow feed. A “sparse slug” flow
regime developed with an upstream slug-annular flow feed. At higher
gas velocity, a “gas continuous with pulsing” regime
developed with an annular flow feed, which had similar features to
the pulsing flow in macroscale packed beds, but it was sensitive and
easily destabilized by disturbances from upstream or downstream pressure
fluctuations. The volumetric L-S mass transfer coefficient decreased
with increasing gas velocity under the liquid-dominated slug flow
regime and became rather less affected under the sparse slug flow
regime. By resolving the transition from the liquid-dominated slug
flow to the sparse slug flow and capturing the onset of the gas-continuous
with pulsing regime, we gained new insights into the hydrodynamic
effects of G-L flows on the L-S mass transfer rates in a MPBR.
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Affiliation(s)
- Enhong Cao
- Department of Chemical Engineering, University College London, London WC1E 7JE United Kingdom
| | - Anand N P Radhakrishnan
- Department of Chemical Engineering, University College London, London WC1E 7JE United Kingdom
| | - Redza Bin Hasanudin
- Department of Chemical Engineering, University College London, London WC1E 7JE United Kingdom
| | - Asterios Gavriilidis
- Department of Chemical Engineering, University College London, London WC1E 7JE United Kingdom
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Hess C. New advances in using Raman spectroscopy for the characterization of catalysts and catalytic reactions. Chem Soc Rev 2021; 50:3519-3564. [PMID: 33501926 DOI: 10.1039/d0cs01059f] [Citation(s) in RCA: 77] [Impact Index Per Article: 25.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Gaining insight into the mode of operation of heterogeneous catalysts is of great scientific and economic interest. Raman spectroscopy has proven its potential as a powerful vibrational spectroscopic technique for a fundamental and molecular-level characterization of catalysts and catalytic reactions. Raman spectra provide important insight into reaction mechanisms by revealing specific information on the catalysts' (defect) structure in the bulk and at the surface, as well as the presence of adsorbates and reaction intermediates. Modern Raman instrumentation based on single-stage spectrometers allows high throughput and versatility in design of in situ/operando cells to study working catalysts. This review highlights major advances in the use of Raman spectroscopy for the characterization of heterogeneous catalysts made during the past decade, including the development of new methods and potential directions of research for applying Raman spectroscopy to working catalysts. The main focus will be on gas-solid catalytic reactions, but (photo)catalytic reactions in the liquid phase will be touched on if it appears appropriate. The discussion begins with the main instrumentation now available for applying vibrational Raman spectroscopy to catalysis research, including in situ/operando cells for studying gas-solid catalytic processes. The focus then moves to the different types of information available from Raman spectra in the bulk and on the surface of solid catalysts, including adsorbates and surface depositions, as well as the use of theoretical calculations to facilitate band assignments and to describe (resonance) Raman effects. This is followed by a presentation of major developments in enhancing the Raman signal of heterogeneous catalysts by use of UV resonance Raman spectroscopy, surface-enhanced Raman spectroscopy (SERS), and shell-isolated nanoparticle surface-enhanced Raman spectroscopy (SHINERS). The application of time-resolved Raman studies to structural and kinetic characterization is then discussed. Finally, recent developments in spatially resolved Raman analysis of catalysts and catalytic processes are presented, including the use of coherent anti-Stokes Raman spectroscopy (CARS) and tip-enhanced Raman spectroscopy (TERS). The review concludes with an outlook on potential future developments and applications of Raman spectroscopy in heterogeneous catalysis.
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Affiliation(s)
- Christian Hess
- Eduard-Zintl-Institut für Anorganische und Physikalische Chemie, Technische Universität Darmstadt, Alarich-Weiss-Str. 8, 64287, Darmstadt, Germany.
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Monolithically Integrated Diffused Silicon Two-Zone Heaters for Silicon-Pyrex Glass Microreactors for Production of Nanoparticles: Heat Exchange Aspects. MICROMACHINES 2020; 11:mi11090818. [PMID: 32872382 PMCID: PMC7569776 DOI: 10.3390/mi11090818] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Revised: 08/23/2020] [Accepted: 08/28/2020] [Indexed: 01/04/2023]
Abstract
We present the design, simulation, fabrication and characterization of monolithically integrated high resistivity p-type boron-diffused silicon two-zone heaters in a model high temperature microreactor intended for nanoparticle fabrication. We used a finite element method for simulations of the heaters’ operation and performance. Our experimental model reactor structure consisted of a silicon wafer anodically bonded to a Pyrex glass wafer with an isotropically etched serpentine microchannels network. We fabricated two separate spiral heaters with different temperatures, mutually thermally isolated by barrier apertures etched throughout the silicon wafer. The heaters were characterized by electric measurements and by infrared thermal vision. The obtained results show that our proposed procedure for the heater fabrication is robust, stable and controllable, with a decreased sensitivity to random variations of fabrication process parameters. Compared to metallic or polysilicon heaters typically integrated into microreactors, our approach offers improved control over heater characteristics through adjustment of the Boron doping level and profile. Our microreactor is intended to produce titanium dioxide nanoparticles, but it could be also used to fabricate nanoparticles in different materials as well, with various parameters and geometries. Our method can be generally applied to other high-temperature microsystems.
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Alshammari K, Niu Y, Palmer RE, Dimitratos N. Optimization of sol-immobilized bimetallic Au-Pd/TiO 2 catalysts: reduction of 4-nitrophenol to 4-aminophenol for wastewater remediation. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2020; 378:20200057. [PMID: 32623991 DOI: 10.1098/rsta.2020.0057] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 04/06/2020] [Indexed: 06/11/2023]
Abstract
A sol-immobilization method is used to synthesize a series of highly active and stable AuxPd1-x/TiO2 catalysts (where x = 0, 0.13, 0.25, 0.5, 0.75, 0.87 and 1) for wastewater remediation. The catalytic performance of the materials was evaluated for the catalytic reduction of 4-nitrophenol, a model wastewater contaminant, using NaBH4 as the reducing agent under mild reaction conditions. Reaction parameters such as substrate/metal and substrate/reducing agent molar ratios, reaction temperature and stirring rate were investigated. Structure-activity correlations were studied using a number of complementary techniques including X-ray powder diffraction, X-ray photoelectron spectroscopy and transmission electron microscopy. The sol-immobilization route provides very small Au-Pd alloyed nanoparticles, with the highest catalytic performance shown by the Au0.5Pd0.5/TiO2 catalyst. This article is part of a discussion meeting issue 'Science to enable the circular economy'.
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Affiliation(s)
- Khaled Alshammari
- School of Chemistry, Cardiff Catalysis Institute (CCI), Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK
| | - Yubiao Niu
- College of Engineering, Swansea University, Bay Campus, Fabian Way, Swansea SA1 8EN, UK
| | - Richard E Palmer
- College of Engineering, Swansea University, Bay Campus, Fabian Way, Swansea SA1 8EN, UK
| | - Nikolaos Dimitratos
- School of Chemistry, Cardiff Catalysis Institute (CCI), Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK
- Dipartimento Chimica Industriale 'Toso Montanari', Universita degli Studi di Bologna, Viale Risorgimento 4, 40136, Bologna, Italy
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Waldron C, Pankajakshan A, Quaglio M, Cao E, Galvanin F, Gavriilidis A. Closed-Loop Model-Based Design of Experiments for Kinetic Model Discrimination and Parameter Estimation: Benzoic Acid Esterification on a Heterogeneous Catalyst. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b04089] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Conor Waldron
- Department of Chemical Engineering, University College London, London WC1E 7JE, U.K
| | - Arun Pankajakshan
- Department of Chemical Engineering, University College London, London WC1E 7JE, U.K
| | - Marco Quaglio
- Department of Chemical Engineering, University College London, London WC1E 7JE, U.K
| | - Enhong Cao
- Department of Chemical Engineering, University College London, London WC1E 7JE, U.K
| | - Federico Galvanin
- Department of Chemical Engineering, University College London, London WC1E 7JE, U.K
| | - Asterios Gavriilidis
- Department of Chemical Engineering, University College London, London WC1E 7JE, U.K
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Waldron C, Pankajakshan A, Quaglio M, Cao E, Galvanin F, Gavriilidis A. An autonomous microreactor platform for the rapid identification of kinetic models. REACT CHEM ENG 2019. [DOI: 10.1039/c8re00345a] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Rapid estimation of kinetic parameters with high precision is facilitated by automation combined with online Model-Based Design of Experiments.
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Affiliation(s)
- Conor Waldron
- Dept of Chemical Engineering
- University College London
- London
- UK
| | | | - Marco Quaglio
- Dept of Chemical Engineering
- University College London
- London
- UK
| | - Enhong Cao
- Dept of Chemical Engineering
- University College London
- London
- UK
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Perro A, Lebourdon G, Henry S, Lecomte S, Servant L, Marre S. Combining microfluidics and FT-IR spectroscopy: towards spatially resolved information on chemical processes. REACT CHEM ENG 2016. [DOI: 10.1039/c6re00127k] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
This review outlines the combination of infrared spectroscopy and continuous microfluidic processes.
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Affiliation(s)
- Adeline Perro
- Institut des Sciences Moléculaires
- Université de Bordeaux—CNRS
- 33405 Talence
- France
| | - Gwenaelle Lebourdon
- Institut des Sciences Moléculaires
- Université de Bordeaux—CNRS
- 33405 Talence
- France
| | - Sarah Henry
- Chimie et Biologie des Membranes et des Nanoobjets
- Université de Bordeaux —CNRS
- 33607 Pessac
- France
| | - Sophie Lecomte
- Chimie et Biologie des Membranes et des Nanoobjets
- Université de Bordeaux —CNRS
- 33607 Pessac
- France
| | - Laurent Servant
- Institut des Sciences Moléculaires
- Université de Bordeaux—CNRS
- 33405 Talence
- France
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