1
|
Bessa MC, Luna-Triguero A, Vicent-Luna JM, Carmo PM, Tsampas MN, Ribeiro AM, Rodrigues AE, Calero S, Ferreira AF. An Efficient Strategy for Electroreduction Reactor Outlet Fractioning into Valuable Products. Ind Eng Chem Res 2023; 62:8847-8863. [PMID: 37304910 PMCID: PMC10251741 DOI: 10.1021/acs.iecr.3c00090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 04/28/2023] [Accepted: 05/10/2023] [Indexed: 06/13/2023]
Abstract
In this work, two industrial dual-step pressure swing adsorption (PSA) processes were designed and simulated to obtain high-purity methane, CO2, and syngas from a gas effluent of a CO2 electroreduction reactor using different design configurations. Among the set of zeolites that was investigated using Monte Carlo and molecular dynamics simulations, NaX and MFI were the ones selected. The dual-PSA process for case study 1 is only capable of achieving a 90.5% methane purity with a 95.2% recovery. As for case study 2, methane is obtained with a 97.5% purity and 95.3% recovery. Both case studies can produce CO2 with high purity and recovery (>97 and 95%, respectively) and syngas with a H2/CO ratio above 4. Although case study 2 allows methane to be used as domestic gas, a much higher value for its energy consumption is observed compared to case study 1 (64.9 vs 29.8 W h molCH4-1).
Collapse
Affiliation(s)
- Mariana C.N. Bessa
- Laboratory
of Separation and Reaction Engineering−Laboratory of Catalysis
and Materials (LSRE-LCM), Department of Chemical Engineering, University of Porto, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal
- ALiCE−Associate
Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
| | - Azahara Luna-Triguero
- Energy
Technology, Department of Mechanical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
- Eindhoven
Institute for Renewable Energy Systems (EIRES), Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Jose M. Vicent-Luna
- Materials
Simulation and Modelling, Department of Applied Physics and Science
Education, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
| | - Paulo M.O.C. Carmo
- Laboratory
of Separation and Reaction Engineering−Laboratory of Catalysis
and Materials (LSRE-LCM), Department of Chemical Engineering, University of Porto, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal
- ALiCE−Associate
Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
| | - Mihalis N. Tsampas
- Dutch Institute
For Fundamental Energy Research (DIFFER), 5612 AJ Eindhoven, The Netherlands
| | - Ana Mafalda Ribeiro
- Laboratory
of Separation and Reaction Engineering−Laboratory of Catalysis
and Materials (LSRE-LCM), Department of Chemical Engineering, University of Porto, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal
- ALiCE−Associate
Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
| | - Alírio E. Rodrigues
- Laboratory
of Separation and Reaction Engineering−Laboratory of Catalysis
and Materials (LSRE-LCM), Department of Chemical Engineering, University of Porto, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal
- ALiCE−Associate
Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
| | - Sofia Calero
- Eindhoven
Institute for Renewable Energy Systems (EIRES), Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
- Materials
Simulation and Modelling, Department of Applied Physics and Science
Education, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
| | - Alexandre F.P. Ferreira
- Laboratory
of Separation and Reaction Engineering−Laboratory of Catalysis
and Materials (LSRE-LCM), Department of Chemical Engineering, University of Porto, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal
- ALiCE−Associate
Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
| |
Collapse
|
2
|
da Silva GCQ, Simon JM, Salazar JM. When less is more: does more Na +-cations mean more adsorption sites for toluene in faujasites? Phys Chem Chem Phys 2023; 25:8028-8042. [PMID: 36876505 DOI: 10.1039/d2cp04644j] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The unique properties of zeolites make them an interesting material to be used in separation processes. The possibility of tailoring some of their characteristics, like the Si/Al ratio, allows optimizing their synthesis for a given task. Concerning the adsorption of toluene by faujasites an understanding of the effect of cations is necessary to foster the elaboration of new materials, which can capture molecules with a high degree of selectivity and sensitivity. Undoubtedly, this knowledge is relevant for a wide range of applications going from the elaboration of technologies for improving the air-quality to diagnostic procedures to prevent health risks. The studies reported here using Grand Canonical Monte Carlo simulations elucidate the role of Na-cations in the adsorption of toluene by faujasites with different Si/Al ratios. They detail how the location of the cations inhibits or enhances the adsorption. The cations located at site II are shown to be those enhancing the adsorption of toluene on faujasites. Interestingly, the cations located at site III generate a hindrance at high loading. This becomes an impediment for the organization of toluene molecules inside faujasites.
Collapse
Affiliation(s)
- G C Q da Silva
- Laboratoire ICB UMR 6303, Université Bourgogne Franche-Comté, 21078 Dijon, France.
| | - J M Simon
- Laboratoire ICB UMR 6303, Université Bourgogne Franche-Comté, 21078 Dijon, France.
| | - J Marcos Salazar
- Laboratoire ICB UMR 6303, Université Bourgogne Franche-Comté, 21078 Dijon, France.
| |
Collapse
|
3
|
Tan X, Robijns S, Thür R, Ke Q, De Witte N, Lamaire A, Li Y, Aslam I, Van Havere D, Donckels T, Van Assche T, Van Speybroeck V, Dusselier M, Vankelecom I. Truly combining the advantages of polymeric and zeolite membranes for gas separations. Science 2022; 378:1189-1194. [PMID: 36520897 DOI: 10.1126/science.ade1411] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Mixed-matrix membranes (MMMs) have been investigated to render energy-intensive separations more efficiently by combining the selectivity and permeability performance, robustness, and nonaging properties of the filler with the easy processing, handling, and scaling up of the polymer. However, truly combining all in one single material has proven very challenging. In this work, we filled a commercial polyimide with ultrahigh loadings of a high-aspect ratio, CO2-philic Na-SSZ-39 zeolite with a three-dimensional channel system that precisely separates gas molecules. By carefully designing both zeolite and MMM synthesis, we created a gas-percolation highway across a flexible and aging-resistant (more than 1 year) membrane. The combination of a CO2-CH4 mixed-gas selectivity of ~423 and a CO2 permeability of ~8300 Barrer outperformed all existing polymer-based membranes and even most zeolite-only membranes.
Collapse
Affiliation(s)
- Xiaoyu Tan
- Centre for Membrane Separations, Adsorption, Catalysis and Spectroscopy for Sustainable Solutions (cMACS), KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
| | - Sven Robijns
- Center for Sustainable Catalysis and Engineering, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
| | - Raymond Thür
- Centre for Membrane Separations, Adsorption, Catalysis and Spectroscopy for Sustainable Solutions (cMACS), KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
| | - Quanli Ke
- Center for Sustainable Catalysis and Engineering, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
| | - Niels De Witte
- Department of Chemical Engineering, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium
| | - Aran Lamaire
- Center for Molecular Modeling, Ghent University, Tech Lane Ghent Science Park, Technologiepark 46, 9052 Zwijnaarde, Belgium
| | - Yun Li
- Centre for Membrane Separations, Adsorption, Catalysis and Spectroscopy for Sustainable Solutions (cMACS), KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
| | - Imran Aslam
- Centre for Membrane Separations, Adsorption, Catalysis and Spectroscopy for Sustainable Solutions (cMACS), KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
| | - Daan Van Havere
- Centre for Membrane Separations, Adsorption, Catalysis and Spectroscopy for Sustainable Solutions (cMACS), KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
| | - Thibaut Donckels
- Center for Sustainable Catalysis and Engineering, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
| | - Tom Van Assche
- Department of Chemical Engineering, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium
| | - Veronique Van Speybroeck
- Center for Molecular Modeling, Ghent University, Tech Lane Ghent Science Park, Technologiepark 46, 9052 Zwijnaarde, Belgium
| | - Michiel Dusselier
- Center for Sustainable Catalysis and Engineering, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
| | - Ivo Vankelecom
- Centre for Membrane Separations, Adsorption, Catalysis and Spectroscopy for Sustainable Solutions (cMACS), KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
| |
Collapse
|
4
|
Zhakisheva B, José Gutiérrez-Sevillano J, Calero S. AMMONIA AND WATER IN ZEOLITES: EFFECT OF ALUMINUM DISTRIBUTION ON THE HEAT OF ADSORPTION. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.122564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
5
|
Farmahini AH, Krishnamurthy S, Friedrich D, Brandani S, Sarkisov L. Performance-Based Screening of Porous Materials for Carbon Capture. Chem Rev 2021; 121:10666-10741. [PMID: 34374527 PMCID: PMC8431366 DOI: 10.1021/acs.chemrev.0c01266] [Citation(s) in RCA: 58] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Indexed: 02/07/2023]
Abstract
Computational screening methods have changed the way new materials and processes are discovered and designed. For adsorption-based gas separations and carbon capture, recent efforts have been directed toward the development of multiscale and performance-based screening workflows where we can go from the atomistic structure of an adsorbent to its equilibrium and transport properties at different scales, and eventually to its separation performance at the process level. The objective of this work is to review the current status of this new approach, discuss its potential and impact on the field of materials screening, and highlight the challenges that limit its application. We compile and introduce all the elements required for the development, implementation, and operation of multiscale workflows, hence providing a useful practical guide and a comprehensive source of reference to the scientific communities who work in this area. Our review includes information about available materials databases, state-of-the-art molecular simulation and process modeling tools, and a complete catalogue of data and parameters that are required at each stage of the multiscale screening. We thoroughly discuss the challenges associated with data availability, consistency of the models, and reproducibility of the data and, finally, propose new directions for the future of the field.
Collapse
Affiliation(s)
- Amir H. Farmahini
- Department
of Chemical Engineering and Analytical Science, School of Engineering, The University of Manchester, Manchester M13 9PL, United Kingdom
| | | | - Daniel Friedrich
- School
of Engineering, Institute for Energy Systems, The University of Edinburgh, Edinburgh EH9 3FB, United Kingdom
| | - Stefano Brandani
- School
of Engineering, Institute of Materials and Processes, The University of Edinburgh, Sanderson Building, Edinburgh EH9 3FB, United Kingdom
| | - Lev Sarkisov
- Department
of Chemical Engineering and Analytical Science, School of Engineering, The University of Manchester, Manchester M13 9PL, United Kingdom
- School
of Engineering, Institute of Materials and Processes, The University of Edinburgh, Sanderson Building, Edinburgh EH9 3FB, United Kingdom
| |
Collapse
|
6
|
Abstract
Fluids in large and small pores display different behaviors with a crossover described through the concept of critical capillarity. Here we report experimental and simulation data for various siliceous zeolites and adsorbates that show unexpected reminiscent capillarity for such nanoporous materials. For pore sizes D exceeding the fluid molecule size, the filling pressures p are found to follow a generic behavior kBT ln p ∼ γ/ρD where γ and ρ are the fluid surface tension and density. This result is rationalized by showing that the filling chemical potential for such ultra-small pores is the sum of an adsorption energy and a capillary energy that remains meaningful even for severe confinements. A phenomenological model, based on Derjaguin’s formalism to bridge macroscopic and molecular theories for condensation in porous materials, is developed to account for the behavior of fluids confined down to the molecular scale from simple parameters. Confined fluids in porous media exhibit different behaviors in large and small pores, the crossover between the two regimes being not well understood. Here the authors show, by experiments and simulations, that capillarity is reminiscent even for very small pore diameters, providing a unified picture.
Collapse
|
7
|
Pullumbi P, Brandani F, Brandani S. Gas separation by adsorption: technological drivers and opportunities for improvement. Curr Opin Chem Eng 2019. [DOI: 10.1016/j.coche.2019.04.008] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
|
8
|
Perez-Carbajo J, Matito-Martos I, Balestra SRG, Tsampas MN, van de Sanden MCM, Delgado JA, Águeda VI, Merkling PJ, Calero S. Zeolites for CO 2-CO-O 2 Separation to Obtain CO 2-Neutral Fuels. ACS APPLIED MATERIALS & INTERFACES 2018; 10:20512-20520. [PMID: 29806451 DOI: 10.1021/acsami.8b04507] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Carbon dioxide release has become an important global issue due to the significant and continuous rise in atmospheric CO2 concentrations and the depletion of carbon-based energy resources. Plasmolysis is a very energy-efficient process for reintroducing CO2 into energy and chemical cycles by converting CO2 into CO and O2 utilizing renewable electricity. The bottleneck of the process is that CO remains mixed with O2 and residual CO2. Therefore, efficient gas separation and recuperation are essential for obtaining pure CO, which, via water gas shift and Fischer-Tropsch reactions, can lead to the production of CO2-neutral fuels. The idea behind this work is to provide a separation mechanism based on zeolites to optimize the separation of carbon dioxide, carbon monoxide, and oxygen under mild operational conditions. To achieve this goal, we performed a thorough screening of available zeolites based on topology and adsorptive properties using molecular simulation and ideal adsorption solution theory. FAU, BRE, and MTW are identified as suitable topologies for these separation processes. FAU can be used for the separation of carbon dioxide from carbon monoxide and oxygen and BRE or MTW for the separation of carbon monoxide from oxygen. These results are reinforced by pressure swing adsorption simulations at room temperature combining adsorption columns with pure silica FAU zeolite and zeolite BRE at a Si/Al ratio of 3. These zeolites have the added advantage of being commercially available.
Collapse
Affiliation(s)
- Julio Perez-Carbajo
- Department of Physical, Chemical, and Natural Systems , Universidad Pablo de Olavide , Ctra. Utrera km 1 , 41013 Seville , Spain
| | - Ismael Matito-Martos
- Department of Physical, Chemical, and Natural Systems , Universidad Pablo de Olavide , Ctra. Utrera km 1 , 41013 Seville , Spain
| | - Salvador R G Balestra
- Department of Physical, Chemical, and Natural Systems , Universidad Pablo de Olavide , Ctra. Utrera km 1 , 41013 Seville , Spain
| | - Mihalis N Tsampas
- DIFFER, Dutch Institute for Fundamental Energy Research , De Zaale 20 , 5612 AJ Eindhoven , The Netherlands
| | - Mauritius C M van de Sanden
- DIFFER, Dutch Institute for Fundamental Energy Research , De Zaale 20 , 5612 AJ Eindhoven , The Netherlands
- Technische Universiteit Eindhoven , 5600 MB Eindhoven , The Netherlands
| | - José A Delgado
- Department of Chemical Engineering , Universidad Complutense de Madrid , 28040 , Madrid , Spain
| | - V Ismael Águeda
- Department of Chemical Engineering , Universidad Complutense de Madrid , 28040 , Madrid , Spain
| | - Patrick J Merkling
- Department of Physical, Chemical, and Natural Systems , Universidad Pablo de Olavide , Ctra. Utrera km 1 , 41013 Seville , Spain
| | - Sofia Calero
- Department of Physical, Chemical, and Natural Systems , Universidad Pablo de Olavide , Ctra. Utrera km 1 , 41013 Seville , Spain
- DIFFER, Dutch Institute for Fundamental Energy Research , De Zaale 20 , 5612 AJ Eindhoven , The Netherlands
- Technische Universiteit Eindhoven , 5600 MB Eindhoven , The Netherlands
| |
Collapse
|
9
|
Prats H, Bahamon D, Giménez X, Gamallo P, Sayós R. Computational simulation study of the influence of faujasite Si/Al ratio on CO2 capture by temperature swing adsorption. J CO2 UTIL 2017. [DOI: 10.1016/j.jcou.2017.07.013] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
10
|
Rubeš M, Trachta M, Koudelková E, Bulánek R, Kasneryk V, Bludský O. Methane adsorption in ADOR zeolites: a combined experimental and DFT/CC study. Phys Chem Chem Phys 2017; 19:16533-16540. [PMID: 28612872 DOI: 10.1039/c7cp02315d] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Physical adsorption of methane in purely siliceous molecular sieves prepared by a recently discovered synthetic pathway using 2D zeolites as nanoscale building blocks has been investigated by means of combined experimental and theoretical approaches. The DFT/CC-based method has been tested on ADOR zeolites of the UTL family and a few experimentally well-characterized siliceous zeolites. Excellent agreement between theoretical and experimental heats of adsorption has been found for OKO, PCR, MFI, CHA and AEI zeolites. The observed discrepancy for the UTL germanosilicate (2 kJ mol-1) has been plausibly explained using a simple model of D4R defects. The proposed methodology can be used as a reliable characterization tool for newly synthesized silica nanomaterials.
Collapse
Affiliation(s)
- M Rubeš
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nám. 2, 162 10 Prague, Czech Republic.
| | | | | | | | | | | |
Collapse
|
11
|
Optimal Faujasite structures for post combustion CO 2 capture and separation in different swing adsorption processes. J CO2 UTIL 2017. [DOI: 10.1016/j.jcou.2017.03.007] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
12
|
Gómez-Álvarez P, Calero S. Highly Selective Zeolite Topologies for Flue Gas Separation. Chemistry 2016; 22:18705-18708. [DOI: 10.1002/chem.201604009] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Indexed: 11/05/2022]
Affiliation(s)
- Paula Gómez-Álvarez
- Department of Physical, Chemical and Natural Systems; Universidad Pablo de Olavide; Ctra. Utrera km 1. 41013 Seville Spain
| | - Sofia Calero
- Department of Physical, Chemical and Natural Systems; Universidad Pablo de Olavide; Ctra. Utrera km 1. 41013 Seville Spain
| |
Collapse
|
13
|
Gómez-Álvarez P, Hamad S, Haranczyk M, Ruiz-Salvador AR, Calero S. Comparing gas separation performance between all known zeolites and their zeolitic imidazolate framework counterparts. Dalton Trans 2016; 45:216-25. [DOI: 10.1039/c5dt04012d] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Candidate structures for environmental and industrial gas separations. No correlation between zeolites and their respective Zeolitic Imidazolate framework counterparts.
Collapse
Affiliation(s)
- Paula Gómez-Álvarez
- Department of Physical
- Chemical
- and Natural Systems
- Universidad Pablo de Olavide
- ES-41013 Seville
| | - Said Hamad
- Department of Physical
- Chemical
- and Natural Systems
- Universidad Pablo de Olavide
- ES-41013 Seville
| | - Maciej Haranczyk
- Lawrence Berkeley National Laboratory
- Computational Research Division
- Berkeley
- USA
| | - A. Rabdel Ruiz-Salvador
- Department of Physical
- Chemical
- and Natural Systems
- Universidad Pablo de Olavide
- ES-41013 Seville
| | - Sofia Calero
- Department of Physical
- Chemical
- and Natural Systems
- Universidad Pablo de Olavide
- ES-41013 Seville
| |
Collapse
|
14
|
Calero S, Gómez-Álvarez P. On the performance of FAU and MFI zeolites for the adsorptive removal of a series of volatile organic compounds from air using molecular simulation. Phys Chem Chem Phys 2015; 17:26451-5. [PMID: 26392021 DOI: 10.1039/c5cp04265h] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Volatile organic compound (VOC) emissions can cause serious risk to human health and the environment. In this work, we used Monte Carlo simulations to assess the performance of industrially important zeolites for the adsorption-based removal of a number of common air pollutants, particularly small saturated and unsaturated hydrocarbons: propane, butane, propene, and 1-butene. We focused on the cage-like FAU and channel-like MFI zeolites. The adsorption isotherms of the multicomponent N2/O2/Ar/VOC mixtures at real concentrations and room temperature reveal a considerable influence of the host topology and pore dimensions. While the adsorption of the VOCs from the mixture in FAU is almost negligible, it is remarkable in MFI. The adsorption selectivity of each VOC over the air compounds exhibits a maximum at about 10(6)-10(7) Pa, and then decreases to virtually zero due to entropic effects. This behaviour for selectivity is maintained regardless of the chain length and the presence of double bonds in the VOC, but the values are indeed affected. Also, we examined the selectivity at 10(7) Pa for a number of other widely used zeolites, with pore features ensuring the diffusion of the adsorbates. Apart from MFI, we also found the channel-like MEL and MTW zeolite candidates for the targeted air decontamination.
Collapse
Affiliation(s)
- S Calero
- Department of Physical, Chemical, and Natural Systems, Universidad Pablo de Olavide, ES-41013 Seville, Spain.
| | | |
Collapse
|