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Zornes A, Abdul Rahman NB, Das OR, Gomez LA, Crossley S, Resasco DE, White JL. Impact of Low-Temperature Water Exposure and Removal on Zeolite HY. J Am Chem Soc 2024; 146:1132-1143. [PMID: 38156885 DOI: 10.1021/jacs.3c12437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2024]
Abstract
Aqueous-phase postsynthetic modifications of the industrially important Y-type zeolite are commonly used to change overall acid site concentrations, introduce stabilizing rare-earth cations, impart bifunctional character through metal cation exchange, and tailor the distribution of Brønsted and Lewis acid sites. Zeolite Y is known to undergo framework degradation in the presence of both vapor- and liquid-phase water at temperatures exceeding 100 °C, and rare-earth exchanged and stabilized HY catalysts are commonly used for fluidized catalytic cracking due to their increased hydrothermal resilience. Here, using detailed spectroscopy, crystallography, and flow-reactor experiments, we reveal unexpected decreases in Brønsted acid site (BAS) density for zeolite HY following exposure even to room-temperature liquid water. These data indicate that aqueous-phase ion-exchange procedures commonly used to modify zeolite Y are impacted by the liquid water and its removal, even when fractional heating rates and inert conditions much less severe than standard practice are used for catalyst dehydration. X-ray diffraction, thermogravimetric, and spectroscopic analyses reveal that the majority of framework degradation occurs during the removal of a strongly bound water fraction in HY, which does not form when NH4Y is immersed in liquid water and which leads to reduced acidity in HY even when dehydration conditions much milder than those typically practiced are employed. Na+-exchanged HY prepared via room-temperature aqueous dissolution demonstrates that Brønsted acid sites are lost in excess of the theoretical maximum that is possible from sodium titration. The structural impact of low-temperature aqueous-phase ion-exchange methods complicates the interpretation of subsequent data and likely explains the wide variation in reported acid site concentrations and catalytic activity of HY zeolites with high-Al content.
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Affiliation(s)
- Anya Zornes
- School of Chemical Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, United States
| | - Nabihan B Abdul Rahman
- School of Sustainable Chemical, Biological, and Materials Engineering, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Omio Rani Das
- School of Chemical Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, United States
| | - Laura A Gomez
- School of Sustainable Chemical, Biological, and Materials Engineering, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Steven Crossley
- School of Sustainable Chemical, Biological, and Materials Engineering, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Daniel E Resasco
- School of Sustainable Chemical, Biological, and Materials Engineering, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - Jeffery L White
- School of Chemical Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, United States
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Effects of surface silylation on dye removal performance of mesoporous promoted titania-silica nanocomposite. KOREAN J CHEM ENG 2023. [DOI: 10.1007/s11814-022-1338-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/11/2023]
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Gong X, Çağlayan M, Ye Y, Liu K, Gascon J, Dutta Chowdhury A. First-Generation Organic Reaction Intermediates in Zeolite Chemistry and Catalysis. Chem Rev 2022; 122:14275-14345. [PMID: 35947790 DOI: 10.1021/acs.chemrev.2c00076] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Zeolite chemistry and catalysis are expected to play a decisive role in the next decade(s) to build a more decentralized renewable feedstock-dependent sustainable society owing to the increased scrutiny over carbon emissions. Therefore, the lack of fundamental and mechanistic understanding of these processes is a critical "technical bottleneck" that must be eliminated to maximize economic value and minimize waste. We have identified, considering this objective, that the chemistry related to the first-generation reaction intermediates (i.e., carbocations, radicals, carbenes, ketenes, and carbanions) in zeolite chemistry and catalysis is highly underdeveloped or undervalued compared to other catalysis streams (e.g., homogeneous catalysis). This limitation can often be attributed to the technological restrictions to detect such "short-lived and highly reactive" intermediates at the interface (gas-solid/solid-liquid); however, the recent rise of sophisticated spectroscopic/analytical techniques (including under in situ/operando conditions) and modern data analysis methods collectively compete to unravel the impact of these organic intermediates. This comprehensive review summarizes the state-of-the-art first-generation organic reaction intermediates in zeolite chemistry and catalysis and evaluates their existing challenges and future prospects, to contribute significantly to the "circular carbon economy" initiatives.
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Affiliation(s)
- Xuan Gong
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, Hubei P. R. China
| | - Mustafa Çağlayan
- KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia
| | - Yiru Ye
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, Hubei P. R. China
| | - Kun Liu
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, Hubei P. R. China
| | - Jorge Gascon
- KAUST Catalysis Center (KCC), King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia
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Weston JS, Jentoft RE, Grady BP, Resasco DE, Harwell JH. Silica Nanoparticle Wettability: Characterization and Effects on the Emulsion Properties. Ind Eng Chem Res 2015. [DOI: 10.1021/ie504311p] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- J. S. Weston
- School of Chemical, Biological
and Materials Engineering, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - R. E. Jentoft
- School of Chemical, Biological
and Materials Engineering, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - B. P. Grady
- School of Chemical, Biological
and Materials Engineering, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - D. E. Resasco
- School of Chemical, Biological
and Materials Engineering, University of Oklahoma, Norman, Oklahoma 73019, United States
| | - J. H. Harwell
- School of Chemical, Biological
and Materials Engineering, University of Oklahoma, Norman, Oklahoma 73019, United States
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Rangnekar N, Mittal N, Elyassi B, Caro J, Tsapatsis M. Zeolite membranes – a review and comparison with MOFs. Chem Soc Rev 2015; 44:7128-54. [DOI: 10.1039/c5cs00292c] [Citation(s) in RCA: 490] [Impact Index Per Article: 54.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The latest developments in zeolite and MOF membranes are reviewed, with an emphasis on synthesis techniques. Industrial applications, hydrothermal stability, polymer-supported and mixed matrix membranes are some of the aspects discussed.
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Affiliation(s)
- N. Rangnekar
- Department of Chemical Engineering and Materials Science
- Minneapolis
- USA
| | - N. Mittal
- Department of Chemical Engineering and Materials Science
- Minneapolis
- USA
| | - B. Elyassi
- Department of Chemical Engineering and Materials Science
- Minneapolis
- USA
| | - J. Caro
- Institut für Physikalische Chemie und Elektrochemie der Leibniz Universität Hannover
- D-30167 Hannover
- Germany
| | - M. Tsapatsis
- Department of Chemical Engineering and Materials Science
- Minneapolis
- USA
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Lu HY, Teng CL, Kung CH, Wan BZ. Preparing Mesoporous Low-k Films with High Mechanical Strength from Noncrystalline Silica Particles. Ind Eng Chem Res 2011. [DOI: 10.1021/ie1018436] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hsin-Yan Lu
- Department of Chemical Engineering, National Taiwan University, Taipei 106, Taiwan
| | - Chin-Lin Teng
- Department of Chemical Engineering, National Taiwan University, Taipei 106, Taiwan
| | - Chien-Hao Kung
- Department of Chemical Engineering, National Taiwan University, Taipei 106, Taiwan
| | - Ben-Zu Wan
- Department of Chemical Engineering, National Taiwan University, Taipei 106, Taiwan
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Kuwahara Y, Yamashita H. Efficient photocatalytic degradation of organics diluted in water and air using TiO2designed with zeolites and mesoporous silica materials. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c0jm02741c] [Citation(s) in RCA: 107] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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