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Ma S, Hester BR, Lloyd AJ, dos Santos AM, Molaison JJ, Wilkinson AP. Synthesis and Properties of the Helium Clathrate and Defect Perovskite [He 2-x □ x ][CaNb]F 6. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2024; 128:11006-11013. [PMID: 38983596 PMCID: PMC11229063 DOI: 10.1021/acs.jpcc.4c02174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/02/2024] [Revised: 06/04/2024] [Accepted: 06/14/2024] [Indexed: 07/11/2024]
Abstract
The defect double perovskite [He2-x □ x ][CaNb]F6, with helium on its A-site, can be prepared by the insertion of helium into ReO3-type CaNbF6 at high pressure. Upon cooling from 300 to 100 K under 0.4 GPa helium, ∼60% of the A-sites become occupied. Helium uptake was quantified by both neutron powder diffraction and gas insertion and release measurements. After the conversion of gauge pressure to fugacity, the uptake of helium by CaNbF6 can be described by a Langmuir isotherm. The enthalpy of absorption for helium in [He2-x □ x ][CaNb]F6 is estimated to be ∼+3(1) kJ mol-1, implying that its formation is entropically favored. Helium is able to diffuse through the material on a time scale of minutes at temperatures down to ∼150 K but is trapped at 100 K and below. The insertion of helium into CaNbF6 reduces the magnitude of its negative thermal expansion, increases the bulk modulus, and modifies its phase behavior. On compressing pristine CaNbF6, at 50 and 100 K, a cubic (Fm3̅m) to rhombohedral (R3̅) phase transition was observed at <0.20 GPa. However, a helium-containing sample remained cubic at 0.4 GPa and 50 K. CaNbF6, compressed in helium at room temperature, remained cubic to >3.7 GPa, the limit of our X-ray diffraction measurements, in contrast to prior reports that upon compression in a nonpenetrating medium, a phase transition is detected at ∼0.4 GPa.
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Affiliation(s)
- Shangye Ma
- School
of Chemistry and Biochemistry, Georgia Institute
of Technology, Atlanta, Georgia 30332-0400, United States
| | - Brett R. Hester
- School
of Chemistry and Biochemistry, Georgia Institute
of Technology, Atlanta, Georgia 30332-0400, United States
| | - Anthony J. Lloyd
- School
of Chemistry and Biochemistry, Georgia Institute
of Technology, Atlanta, Georgia 30332-0400, United States
| | - Antonio M. dos Santos
- Neutron
Scattering Division, Oak Ridge National
Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Jamie J. Molaison
- Neutron
Scattering Division, Oak Ridge National
Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Angus P. Wilkinson
- School
of Chemistry and Biochemistry, Georgia Institute
of Technology, Atlanta, Georgia 30332-0400, United States
- School
of Materials Science and Engineering, Georgia
Institute of Technology, Atlanta, Georgia 30332-0245, United States
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Kurth M, Javed M, Schliermann T, Brösigke G, Kämnitz S, Bhatia SK, Repke JU. Pure Hydrogen and Methane Permeation in Carbon-Based Nanoporous Membranes: Adsorption Isotherms and Permeation Experiments. MEMBRANES 2024; 14:123. [PMID: 38921490 PMCID: PMC11205412 DOI: 10.3390/membranes14060123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2024] [Revised: 05/16/2024] [Accepted: 05/21/2024] [Indexed: 06/27/2024]
Abstract
This paper presents the results of adsorption and permeation experiments of hydrogen and methane at elevated temperatures on a carbon-based nanoporous membrane material provided by Fraunhofer IKTS. The adsorption of pure components was measured between 90 °C and 120°C and pressures up to 45 bar. The Langmuir adsorption isotherm shows the best fit for all data points. Compared to available adsorption isotherms of H2 and CH4 on carbon, the adsorption on the investigated nanoporous carbon structures is significantly lower. Single-component permeation experiments were conducted on membranes at temperatures up to 220 °C. After combining the experimental results with a Maxwell-Stefan surface diffusion model, Maxwell-Stefan surface diffusion coefficients Dis were calculated. The calculated values are in line with an empirical model and thus can be used in future multi-component modeling approaches in order to better analyze and design a membrane system. The published adsorption data fill a gap in the available adsorption data for CH4 and H2.
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Affiliation(s)
- Matthis Kurth
- DBFZ Deutsches Biomasseforschungszentrum Gemeinnützige GmbH, 116, 04347 Leipzig, Germany
| | - Mudassar Javed
- Dynamik und Betrieb Technischer Anlagen, Technische Universität Berlin, 10623 Berlin, Germany
| | - Thomas Schliermann
- DBFZ Deutsches Biomasseforschungszentrum Gemeinnützige GmbH, 116, 04347 Leipzig, Germany
| | - Georg Brösigke
- Dynamik und Betrieb Technischer Anlagen, Technische Universität Berlin, 10623 Berlin, Germany
| | - Susanne Kämnitz
- Fraunhofer Institut für Keramische Technologien und Systeme IKTS, 07629 Hermsdorf, Germany
| | - Suresh K. Bhatia
- School of Chemical Engineering, University of Queensland, Brisbane 4072, Australia
| | - Jens-Uwe Repke
- Dynamik und Betrieb Technischer Anlagen, Technische Universität Berlin, 10623 Berlin, Germany
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3
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Koonani S, Ghiasvand A. A comprehensive theory for vacuum-assisted headspace extraction of solid samples. J Chromatogr A 2023; 1712:464465. [PMID: 37907003 DOI: 10.1016/j.chroma.2023.464465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 09/25/2023] [Accepted: 10/17/2023] [Indexed: 11/02/2023]
Abstract
Vacuum-assisted headspace extraction (VA-HSE) has proven to be an efficient solution for the rapid and effective extraction of volatile and semi-volatile species. The research has been mainly focused on liquid samples by considering differences in Henry's constants, while the accelerating effect of vacuum is more significant and practically more important in solid samples with complex matrices. Nevertheless, the lack of a comprehensive theory for VA-HSE in solid samples, based on the adsorption/desorption phenomena, is quite evident. This research was done with the aim of modeling VA-HSE of solid samples from a thermodynamic point of view. To understand the impact and mechanism of reduced pressure, the sampling space was divided into three separate areas including the solid matrix (the surface and cavities of the solid sample), the headspace of the sample, and the extraction phase (the surface and cavities of the adsorbent). The effects of vacuum on the movement of analyte molecules in all three areas were investigated and included in a comprehensive equation. According to the theoretical model, when a solid sample is subjected to vacuum conditions, the enthalpy of the analytes in their free state decreases. As a result, the analytes become more volatile. Additionally, vacuum reduces the thickness of the boundary layer in solid samples. This facilitates the diffusion of analyte molecules into the cavities within the solid material and eventually into the headspace of the sample. A similar effect is observed on the extractive phase side when vacuum is applied. The reduction in boundary layer thickness promotes the adsorption of analytes onto the extractive phase, thereby facilitating a quicker equilibrium of analyte concentration in the extraction phase. The proposed model was validated by correlating it with the experimental data found in the literature. The results of this analysis have shown a robust correlation between the theoretical model and the experimental data, bolstering the reliability of the model, and highlighting its practical relevance.
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Affiliation(s)
- Samira Koonani
- Department of Analytical Chemistry, Faculty of Chemistry, Lorestan University, Khorramabad, Iran
| | - Alireza Ghiasvand
- Department of Analytical Chemistry, Faculty of Chemistry, Lorestan University, Khorramabad, Iran.
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Oliveira MR, Cecilia JA, Ballesteros-Plata D, Barroso-Martín I, Núñez P, Infantes-Molina A, Rodríguez-Castellón E. Microwave-Assisted Synthesis of Zeolite A from Metakaolinite for CO 2 Adsorption. Int J Mol Sci 2023; 24:14040. [PMID: 37762341 PMCID: PMC10530832 DOI: 10.3390/ijms241814040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Revised: 09/10/2023] [Accepted: 09/11/2023] [Indexed: 09/29/2023] Open
Abstract
The global demand for energy and industrial growth has generated an exponential use of fossil fuels in recent years. It is well known that carbon dioxide (CO2) is mainly produced, but not only from fuels, which has a negative impact on the environment, such as the increasing emission of greenhouse gases. Thus, thinking about reducing this problem, this study analyzes microwave irradiation as an alternative to conventional heating to optimize zeolite A synthesis conditions for CO2 capture. Synthesis reaction parameters such as different temperatures (60-150 °C) and different time durations (1-6 h) were evaluated. The CO2 adsorption capacity was evaluated by CO2 adsorption-desorption isotherms at 25 °C and atmospheric pressure. The results showed that the synthesis of zeolite A by microwave irradiation was successfully obtained from natural kaolinite (via metakaolinization), reducing both temperature and time. Adsorption isotherms show that the most promising adsorbent for CO2 capture is a zeolite synthesized at 100 °C for 4 h, which reached an adsorption capacity of 2.2 mmol/g.
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Affiliation(s)
- Marilia R. Oliveira
- Center for Studies in Colloidal Systems (NUESC), Laboratory of Materials Synthesis and Chromatography, Institute of Technology and Research (ITP), Tiradentes University (UNIT), Aracaju 49032-490, SE, Brazil;
| | - Juan A. Cecilia
- Department of Inorganic Chemistry, Crystallography and Mineralogy, Malaga University, 29071 Málaga, Spain; (D.B.-P.); (A.I.-M.)
| | - Daniel Ballesteros-Plata
- Department of Inorganic Chemistry, Crystallography and Mineralogy, Malaga University, 29071 Málaga, Spain; (D.B.-P.); (A.I.-M.)
| | - Isabel Barroso-Martín
- Department of Inorganic Chemistry, Crystallography and Mineralogy, Malaga University, 29071 Málaga, Spain; (D.B.-P.); (A.I.-M.)
| | - Pedro Núñez
- Department of Chemistry, Institute of Materials and Nanotechnology, University of La Laguna, 38200 Tenerife, Spain;
| | - Antonia Infantes-Molina
- Department of Inorganic Chemistry, Crystallography and Mineralogy, Malaga University, 29071 Málaga, Spain; (D.B.-P.); (A.I.-M.)
| | - Enrique Rodríguez-Castellón
- Department of Inorganic Chemistry, Crystallography and Mineralogy, Malaga University, 29071 Málaga, Spain; (D.B.-P.); (A.I.-M.)
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Liu W, Qi M, Chu X, Peng S, Han D. Investigation of adsorption-diffusion behaviors of elementary O 2, CO 2, and N 2 in coal particles: influence from temperature. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023:10.1007/s11356-023-27949-4. [PMID: 37277585 DOI: 10.1007/s11356-023-27949-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Accepted: 05/23/2023] [Indexed: 06/07/2023]
Abstract
Adsorption-diffusion behaviors of gases (i.e., O2, CO2, and N2) in coal are directly related to the coal spontaneous combustion (CSC), in which the temperature is the key factor affecting the gas migration process in coal. In this work, isothermal adsorption experiments of O2, CO2, and N2 under different temperatures were carried out on bituminous coal and anthracite coal samples at 0.5 MPa, respectively. Based on the free gas density gradient diffusion (FDGD) model, the microchannel diffusion coefficients of different gases at different temperatures were calculated, and the effects from temperature were quantitatively evaluated. The results acquired from the experiment and simulation show that (i) the adsorption capacity of these three gases decreases as the temperature increases, and the adsorption capacity at the same temperature satisfies CO2 > O2 > N2; (ii) the FDGD model is verified to be still applicable at different temperatures, indicating that the adsorption-diffusion behavior of O2, CO2, and N2 in coal particles at different temperatures is still consistent with the FDGD diffusion; (iii) the microchannel diffusion coefficient Km of the three gases gradually increases when the temperature goes up. The present work contributes to the understanding of the gases migration process in the development of CSC.
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Affiliation(s)
- Wei Liu
- School of Emergency Management and Safety Engineering, China University of Mining and Technology-Beijing, Beijing, 100083, China.
| | - Minghui Qi
- School of Emergency Management and Safety Engineering, China University of Mining and Technology-Beijing, Beijing, 100083, China
| | - Xiangyu Chu
- School of Emergency Management and Safety Engineering, China University of Mining and Technology-Beijing, Beijing, 100083, China
| | - Shiyang Peng
- School of Emergency Management and Safety Engineering, China University of Mining and Technology-Beijing, Beijing, 100083, China
| | - Dongyang Han
- School of Emergency Management and Safety Engineering, China University of Mining and Technology-Beijing, Beijing, 100083, China
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Ahrestani Z, Sadeghzadeh S, Motejadded Emrooz HB. An overview of atmospheric water harvesting methods, the inevitable path of the future in water supply. RSC Adv 2023; 13:10273-10307. [PMID: 37034449 PMCID: PMC10073925 DOI: 10.1039/d2ra07733g] [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: 12/05/2022] [Accepted: 02/12/2023] [Indexed: 04/11/2023] Open
Abstract
Although science has made great strides in recent years, access to fresh water remains a major challenge for humanity due to water shortage for two-thirds of the world's population. Limited access to fresh water becomes more difficult due to the lack of natural resources of water. Many of these resources are also contaminated by human activities. Many attempts have been made to harvest water from the atmosphere, and condensation systems have received much attention. One of the challenges in generation systems is the high consumption energy of the cooling feed, despite the generation of large amounts of water from the atmosphere. As other airborne contaminants condense with water vapor, the water after harvesting needs to be treated, which adds to construction and maintenance costs. Also, the need for high relative humidity in condensation systems has led scientists to find ways of atmospheric water harvesting at low relative humidity and use renewable energy sources. Sorption systems can absorb atmospheric water without the need for an energy supply and spontaneously. Desiccants such as silica gel and zeolite, due to their high affinity for water, can absorb water vapor in the air through physical or physicochemical bonding, but all of these have slow adsorption kinetics. Therefore, it takes a long time for the water harvesting cycle or they are not able to absorb water at low relative humidity, and others need a lot of energy for the water desorption phase. Metal-Organic Frameworks (MOF) are porous materials that, due to their special structure, are considered the most promising material for atmospheric water harvesting at low relative humidity. MOF-303 has been identified as the most efficient material to date and can harvest 0.7 liters of water per kilogram of MOF-303 at 10% RH and 27 °C. MOFs can harvest atmospheric water even in desert areas using only solar energy, and the water produced is drinkable and does not need to be treated. In this review, systems and methods of atmospheric water harvesting will be studied and compared and then the mechanism of adsorption and desorption in sorption systems will be discussed in detail.
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Affiliation(s)
- Zahra Ahrestani
- MSc of Chemistry and Materials Technologie, Institute of Materials Chemistry, Faculty of Chemistry, University of Vienna Vienna Austria
- MSc of NanoTechnology, School of Advanced Technologies, Iran University of Science and Technology Tehran Iran
| | - Sadegh Sadeghzadeh
- School of Advanced Technologies, Iran University of Science and Technology Tehran Iran
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7
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Adsorption Characteristics and Electrochemical Behaviors of Congo Red onto Magnetic MgxCo(1−x)Fe2O4 Nanoparticles Prepared via the Alcohol Solution Combustion Process of Nitrate. J Inorg Organomet Polym Mater 2023. [DOI: 10.1007/s10904-023-02545-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/21/2023]
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8
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Estimation of isosteric heat of adsorption from generalized Langmuir isotherm. ADSORPTION 2023. [DOI: 10.1007/s10450-023-00379-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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9
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de Oliveira LH, Pereira MV, Meneguin JG, de Barros MAS, do Nascimento JF, Arroyo PA. Influence of regeneration conditions on cyclic CO2 adsorption on NaA zeolite at high pressures. J CO2 UTIL 2023. [DOI: 10.1016/j.jcou.2022.102296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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10
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Discrepancy quantification between experimental and simulated data of CO2 adsorption isotherm using hierarchical Bayesian estimation. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.121371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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11
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Analogize of metal-organic frameworks (MOFs) adsorbents functional sites for Hg2+ ions removal. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.121471] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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12
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Wu Y, Ye H, Fan F. Nonenzymatic Browning of Amorphous Maltose/Whey Protein Isolates Matrix: Effects of Water Sorption and Molecular Mobility. Foods 2022; 11:foods11142128. [PMID: 35885371 PMCID: PMC9324457 DOI: 10.3390/foods11142128] [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: 06/06/2022] [Revised: 07/11/2022] [Accepted: 07/12/2022] [Indexed: 11/16/2022] Open
Abstract
Nonenzymatic browning (NEB) reactions often affect the nutritional quality and safety properties of amorphous food solids. Developing a proper approach to control the NEB reaction has been of particular interest in the food industry. An NEB reaction in an amorphous maltose/Whey protein isolates (WPI) matrix containing L-lysine and D-xylose as reactants were studied at ambient temperatures aw ≤ 0.44 and 45~65 °C. The results indicated that the presence of NEB reactants barely disturbed the water sorption behavior of the matrix. The Guggenheim–Anderson–de Boer (GAB) constants and Qst values of the studied samples were affected by storage conditions as the migration of sorbed water among monolayers occurred. The rate of color changes and 5-hydoxymethylfurfural (5-HMF) accumulation on the matrix were accelerated at high ambient temperatures aw, reflecting the extent of NEB reaction increases. Since the strength concept (S) could give a measure of molecular mobility, the extent of the NEB reaction was governed by the molecular mobility of the matrix as the activation energy (Ea) of 5-HMF production minimized at solids with high S values. We found that the S concept had a considerable potential usage in controlling the NEB reaction on amorphous sugar–protein solids. This data set has practical significance in the comprehensive understanding of manipulating the diffusion-limited chemical reactions on low-moisture food solids.
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Affiliation(s)
- Yaowen Wu
- Department of Food Science and Engineering, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China; (Y.W.); (H.Y.)
| | - Haoxuan Ye
- Department of Food Science and Engineering, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China; (Y.W.); (H.Y.)
| | - Fanghui Fan
- Department of Food Science and Engineering, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China; (Y.W.); (H.Y.)
- Institute of Advanced Study, Shenzhen University, Shenzhen 518060, China
- Shenzhen Key Laboratory of Food Macromolecules Science and Processing, Shenzhen University, Shenzhen 518060, China
- Correspondence: ; Tel.: +86-755-26535516
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Evaluation of the Adsorptive Process on Adsorbent Surfaces as a Function of Pressure in an Isosteric System Compared with Adsorption Isotherm. CHEMENGINEERING 2022. [DOI: 10.3390/chemengineering6040052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The developing significance of adsorption has brought about a steadily expanding quantity of logical and innovative writing on different adsorbents. This paper intends to propose experimental and computational methods for measuring the strength of adsorbate–solid interactions. It primarily focuses on the use of graphs to measure the effectiveness of an adsorbate’s bonds with the solid adsorbent by determining the isosteric heat. The Clausius–Clapeyron model equation is used to determine the isosteric enthalpy of adsorption from two adsorption isotherms at various but close temperatures, with ΔT of 10 °C. A full computational explanation of the Clausius–Clapeyron model equation for determining ΔHads is provided using experimental data. Logarithmic plots of uptakes vs. p in the low-pressure zone for the Freundlich–Langmuir graph are used to assess and confirm the quality of the crucial underlying isotherms. The isosteric heat was found to be between 13.5 kJ/mol and 16 kJ/mol.
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14
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Importance of spectroscopic and static gravimetric studies for exploring adsorption behavior of propan-2-ol vapor in a fixed-bed column. Chem Eng Res Des 2022. [DOI: 10.1016/j.cherd.2021.12.043] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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15
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Vyawahare P, Tun H, Vaughn MW, Chen C. From Langmuir isotherm to Brunauer–Emmett–Teller isotherm. AIChE J 2021. [DOI: 10.1002/aic.17523] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Pradeep Vyawahare
- Department of Chemical Engineering Texas Tech University Lubbock Texas USA
| | - Hla Tun
- Department of Chemical Engineering Texas Tech University Lubbock Texas USA
| | - Mark W. Vaughn
- Department of Chemical Engineering Texas Tech University Lubbock Texas USA
| | - Chau‐Chyun Chen
- Department of Chemical Engineering Texas Tech University Lubbock Texas USA
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