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Yang D, Doan HV, O’Hara U, Reed D, Hungerford J, Eloi JC, Pridmore NE, Henry PF, Rochat S, Tian M, Ting VP. Impact of Cations and Framework on Trapdoor Behavior: A Study of Dynamic and In Situ Gas Analysis. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:12394-12406. [PMID: 38832461 PMCID: PMC11191699 DOI: 10.1021/acs.langmuir.4c00498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Revised: 04/25/2024] [Accepted: 04/26/2024] [Indexed: 06/05/2024]
Abstract
Due to their distinct and tailorable internal cavity structures, zeolites serve as promising materials for efficient and specific gas separations such as the separation of /CO2 from N2. A subset of zeolite materials exhibits trapdoor behavior which can be exploited for particularly challenging separations, such as the separation of hydrogen, deuterium, and tritium for the nuclear industry. This study systematically delves into the influence of the chabazite (CHA) and merlinoite (MER) zeolite frameworks combined with different door-keeping cations (K+, Rb+, and Cs+) on the trapdoor separation behavior under a variety of thermal and gas conditions. Both CHA and MER frameworks were synthesized from the same parent Y-zeolite and studied using in situ X-ray diffraction as a function of increasing temperatures under 1 bar H2 exposures. This resulted in distinct thermal responses, with merlinoite zeolites exhibiting expansion and chabazite zeolites showing contraction of the crystal structure. Simultaneous thermal analysis (STA) and gas sorption techniques further demonstrated how the size of trapdoor cations restricts access to the internal porosities of the zeolite frameworks. These findings highlight that both the zeolite frameworks and the associated trapdoor cations dictate the thermal response and gas sorption behavior. Frameworks determine the crystalline geometry, the maximum porosities, and displacement of the cation in gas sorption, while associated cations directly affect the blockage of the functional sites and the thermal behavior of the frameworks. This work contributes new insights into the efficient design of zeolites for gas separation applications and highlights the significant role of the trapdoor mechanism.
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Affiliation(s)
- Dankun Yang
- Department
of Mechanical Engineering, University of
Bristol, Bristol BS8 1TR, U.K.
| | - Huan V. Doan
- Department
of Mechanical Engineering, University of
Bristol, Bristol BS8 1TR, U.K.
- Research
School of Chemistry, Australian National
University, Canberra 2601, Australia
| | - Una O’Hara
- Department
of Chemistry, University of Birmingham, Birmingham B15 2TT, U.K.
| | - Daniel Reed
- School
of Metallurgy & Materials, University
of Birmingham, Birmingham, B15 2TT, U.K.
| | - Julian Hungerford
- Micromeritics
Instrument Corp., Norcross Georgia 30093, United States
| | | | | | - Paul F. Henry
- ISIS
Pulsed Neutron & Muon Source, Rutherford
Appleton Laboratory, Harwell Campus, Didcot, OX11 0QX, U.K.
- Department
of Chemistry, Ångström Laboratory, Lägerhyddsvägen 1, Box 538, SE-751 21 Uppsala, Sweden
| | - Sebastien Rochat
- School of
Chemistry, University of Bristol, Bristol BS8 1TS, U.K.
- School
of Engineering Mathematics and Technology, University of Bristol, Bristol BS8 1TS, U.K.
| | - Mi Tian
- College
of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, U.K.
| | - Valeska P. Ting
- Department
of Mechanical Engineering, University of
Bristol, Bristol BS8 1TR, U.K.
- Research
School of Chemistry, Australian National
University, Canberra 2601, Australia
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Yadav VK, Choudhary N, Inwati GK, Rai A, Singh B, Solanki B, Paital B, Sahoo DK. Recent trends in the nanozeolites-based oxygen concentrators and their application in respiratory disorders. Front Med (Lausanne) 2023; 10:1147373. [PMID: 37181347 PMCID: PMC10174459 DOI: 10.3389/fmed.2023.1147373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2023] [Accepted: 04/05/2023] [Indexed: 05/16/2023] Open
Abstract
Medical-grade oxygen is the basic need for all medical complications, especially in respiratory-based discomforts. There was a drastic increase in the demand for medical-grade oxygen during the current pandemic. The non-availability of medical-grade oxygen led to several complications, including death. The oxygen concentrator was only the last hope for the patient during COVID-19 pandemic around the globe. The demands also are everlasting during other microbial respiratory infections. The yield of oxygen using conventional molecular zeolites in the traditional oxygen concentrator process is less than the yield noticed when its nano-form is used. Nanotechnology has enlightened hope for the efficient production of oxygen by such oxygen concentrators. Here in the current review work, the authors have highlighted the basic structural features of oxygen concentrators along with the current working principle. Besides, it has been tried to bridge the gap between conventional oxygen concentrators and advanced ones by using nanotechnology. Nanoparticles being usually within 100 nm in size have a high surface area to volume ratio, which makes them suitable adsorbents for oxygen. Here authors have suggested the use of nano zeolite in place of molecular zeolites in the oxygen concentrator for efficient delivery of oxygen by the oxygen concentrators.
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Affiliation(s)
- Virendra Kumar Yadav
- Department of Biosciences, School of Liberal Arts and Sciences, Mody University of Science and Technology, Lakshmangarh, Rajasthan, India
- Department of Life Sciences, Hemchandracharya North Gujarat University, Patan, Gujarat, India
- *Correspondence: Virendra Kumar Yadav,
| | - Nisha Choudhary
- Department of Life Sciences, Hemchandracharya North Gujarat University, Patan, Gujarat, India
- Department of Environment Sciences, School of Sciences, P P Savani University, Surat, Gujarat, India
| | | | - Ashita Rai
- School of Environment and Sustainable Development, Central University of Gujarat, Gandhinagar, Gujarat, India
| | - Bijendra Singh
- School of Chemical Sciences, Central University of Gujarat, Gandhinagar, Gujarat, India
| | - Bharat Solanki
- Department of Biochemistry, M B Patel Science College, Anand, Gujarat, India
| | - Biswaranjan Paital
- Redox Regulation Laboratory, Department of Zoology, College of Basic Science and Humanities, Odisha University of Agriculture and Technology, Bhubaneswar, India
- Biswaranjan Paital,
| | - Dipak Kumar Sahoo
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Iowa State University, Ames, IA, United States
- Dipak Kumar Sahoo, ;
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Isfahani AP, Arabi Shamsabadi A, Soroush M. MXenes and Other Two-Dimensional Materials for Membrane Gas Separation: Progress, Challenges, and Potential of MXene-Based Membranes. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c02042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ali Pournaghshband Isfahani
- Department of Chemical and Biological Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States
| | - Ahmad Arabi Shamsabadi
- Department of Chemical and Biological Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States
| | - Masoud Soroush
- Department of Chemical and Biological Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States
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Nanomaterials for Membranes, Membrane Reactors, and Catalyst Systems. NANOMATERIALS 2022; 12:nano12060964. [PMID: 35335777 PMCID: PMC8952564 DOI: 10.3390/nano12060964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Accepted: 03/03/2022] [Indexed: 02/05/2023]
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Synthesis of SAPO-34 Nanoplates with High Si/Al Ratio and Improved Acid Site Density. NANOMATERIALS 2021; 11:nano11123198. [PMID: 34947545 PMCID: PMC8703864 DOI: 10.3390/nano11123198] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/24/2021] [Revised: 11/14/2021] [Accepted: 11/19/2021] [Indexed: 11/23/2022]
Abstract
Two-dimensional SAPO-34 molecular sieves were synthesized by microwave hydrothermal process. The concentrations of structure directing agent (SDA), phosphoric acid, and silicon in the gel solution were varied and their effect on phase, shape, and composition of synthesized particles was studied. The synthesized particles were characterized by various techniques using SEM, XRD, BET, EDX, and NH3-TPD. Various morphologies of particles including isotropic, hyper rectangle, and nanoplates were obtained. It was found that the Si/Al ratio of the SAPO-34 particles was in a direct relationship with the density of acid sites. Moreover, the gel composition and preparation affected the chemistry of the synthesized particles. The slow addition of phosphoric acid improved the homogeneity of synthesis gel and resulted in SAPO-34 nanoplates with high density of acid sites, 3.482 mmol/g. The SAPO-34 nanoplates are expected to serve as a high performance catalyst due to the low mass transfer resistance and the high density of active sites.
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