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Millán E, Mota N, Guil-lópez R, Pawelec B, García Fierro JL, Navarro RM. Direct Synthesis of Dimethyl Ether from Syngas on Bifunctional Hybrid Catalysts Based on Supported H3PW12O40 and Cu-ZnO(Al): Effect of Heteropolyacid Loading on Hybrid Structure and Catalytic Activity. Catalysts 2020; 10:1071. [DOI: 10.3390/catal10091071] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The performance of bifunctional hybrid catalysts based on phosphotungstic acid (H3PW12O40, HPW) supported on TiO2 combined with Cu-ZnO(Al) catalyst in the direct synthesis of dimethyl ether (DME) from syngas has been investigated. We studied the effect of the HPW loading on TiO2 (from 1.4 to 2.7 monolayers) on the dispersion and acid characteristics of the HPW clusters. When the concentration of the heteropoliacid is slightly higher than the monolayer (1.4 monolayers) the acidity of the clusters is perturbed by the surface of titania, while for concentration higher than 1.7 monolayers results in the formation of three-dimensional HPW nanocrystals with acidity similar to the bulk heteropolyacid. Physical hybridization of supported heteropolyacids with the Cu-ZnO(Al) catalyst modifies both the acid characteristics of the supported heteropolyacids and the copper surface area of the Cu-ZnO(Al) catalyst. Hybridization gives rise to a decrease in the copper surface area and the disappearance of the strong acidic sites typical of HPW nanocrystals, showing all hybrids similar acid sites of weak or medium strength. The activity of the hybrids was tested for direct DME synthesis from syngas at 30 bar and 250 °C; only the hybrids with HPW loading higher than 1.4 monolayers showed activity for the direct synthesis of DME, showing that the sample loaded with 2.7 monolayers of heteropolyacid had higher activity than the reference hybrid representative of the most widely applied catalysts based on the combination of Cu-ZnO(Al) with HZSM-5. In spite of the high activity of the hybrids, they show a moderate loss in the DME production with TOS that denotes some kind of deactivation of the acidity function under reaction conditions.
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García-Trenco A, Vidal-Moya A, Martínez A. Study of the interaction between components in hybrid CuZnAl/HZSM-5 catalysts and its impact in the syngas-to-DME reaction. Catal Today 2012. [DOI: 10.1016/j.cattod.2011.06.034] [Citation(s) in RCA: 89] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Hashimoto S, Yamashita S. Visual observation of contact-induced intercrystalline migration of aromatic species adsorbed in zeolites by fluorescence microscopy. Chemphyschem 2005; 5:1585-91. [PMID: 15535558 DOI: 10.1002/cphc.200400167] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Intercrystalline migration and a migration-assisted chemical reaction of adsorbed aromatic species between zeolite particles in physical contact were visualized by fluorescence microscopy coupled with a particle manipulation technique. The luminescence color characteristics of particular zeolite particles originating from the specific photochemistry of adsorbed species was exploited to follow the migration of the molecules. Two examples are shown that are relevant to the visualization of the time-dependent migration process: A one guest-two sets of zeolite crystals system: chrysene (Chry)-loaded zeolite Na+ -X (the sodium form of zeolite X) crystals were placed in contact with unloaded Tl+ -X (thallium-exchanged X) crystals and allowed to stand at room temperature. Initially, the blue fluorescence of Chry was detected only from the Na+ -X particles, but later, the development of green phosphorescence emission was discernible from the Tl+ -X which suggests that Chry migrated from the Na+ -X to the Tl+ -X crystals. A two guest-species systems: Electron-donating Chry-loaded Na+ -X crystals were placed in contact with electron-accepting 1,2,4,5-tetracyanobenzene (TCNB)-loaded Na+ -X or Na+ -Y crystals. With time, the former system (Chry/Na+ -X and TCNB/Na+ -X) gave rise to the emission of Chry-TCNB charge-transfer complexes resulting mainly from the migration of Chry while the latter system (Chry/Na+ -X and TCNB/Na+ -Y) afforded the same emission resulting largely from the migration of TCNB. The present investigation reveals that there is a certain direction for guest migration depending on the zeolite host and the nature of host-guest or guest-guest interaction.
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Affiliation(s)
- Shuichi Hashimoto
- Chemistry Department and Advanced Engineering Courses, Gunma College of Technology, Maebashi, Gunma 371-8530, Japan.
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Affiliation(s)
- Hyunjung Lee
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
| | - Prabir K. Dutta
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
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Herndon JW, Wang H. Coupling of Fischer Carbene Complexes with Conjugated Enyne−Aldehydes and Ketones: A Novel Synthesis of Furan Derivatives. J Org Chem 1998. [DOI: 10.1021/jo9803939] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- James W. Herndon
- Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003, and Department of Chemistry & Biochemistry, University of Maryland, College Park, Maryland 20742-2021
| | - Haixia Wang
- Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003, and Department of Chemistry & Biochemistry, University of Maryland, College Park, Maryland 20742-2021
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Sulikowski B, Find J, Karge HG, Herein D. Solid-state ion exchange in zeolites: Part 8. Interaction of lanthanum(III) chloride with zeolites under anhydrous conditions. ACTA ACUST UNITED AC 1997. [DOI: 10.1016/s0144-2449(97)00118-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Karge HG. Post-synthesis modification of microporous materials by solid-state reactions. Progress in Zeolite and Microporous Materials, Preceedings of the 11th International Zeolite Conference. Elsevier; 1997. pp. 1901-48. [DOI: 10.1016/s0167-2991(97)80658-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
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Yang X, Blosser PW. Location and bonding of cations in ETS-10 titanosilicate molecular sieve: A multinuclear n.m.r. investigation. ACTA ACUST UNITED AC 1996. [DOI: 10.1016/0144-2449(96)00026-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Kalogeras JM, Vassilikou-Dova A. Molecular Mobility in Microporous Architectures: Conductivity and Dielectric Relaxation Phenomena in Natural and Synthetic Zeolites. Cryst Res Technol 1996. [DOI: 10.1002/crat.2170310602] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Kosanović C, Cˇizˇmek A, Subotić B, Sˇmit I, Stubicˇar M, Tonejc A. Mechanochemistry of zeolites. Part 4: Influence of cations on the rate of amorphization of zeolite A by ball milling. ACTA ACUST UNITED AC 1995; 15:632-6. [DOI: 10.1016/0144-2449(95)00036-6] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Thoret J, Marchal C, Dorémieux-morin C, Man P, Gruia M, Fraissard J. Solid-state interaction between NaY zeolite and vanadium pentoxide, molybdenum trioxide, or tungsten trioxide. ACTA ACUST UNITED AC 1993; 13:269-75. [DOI: 10.1016/0144-2449(93)90005-n] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Karge HG, Beyer HK. Introduction of Cations into Zeolites by Solid-State Reaction. Zeolite Chemistry and Catalysis, Proceedings of an International Symposium. Elsevier; 1991. pp. 43-64. [DOI: 10.1016/s0167-2991(08)61555-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
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Fraissard J, Gedeon A, Chen Q, Ito T. 129Xe NMR study of intra- and inter- crystallite diffusion of cations in faujasite zeolites. ACTA ACUST UNITED AC 1991. [DOI: 10.1016/s0167-2991(08)61601-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
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Borbély G, Beyer HK, Radics L, Sándor P, Karge HG. Solid-state ion exchange in zeolites: Part IV. Evidence for contact-induced ion exchange between hydrated NaY zeolite and metal chlorides. ACTA ACUST UNITED AC 1989; 9:428-31. [DOI: 10.1016/0144-2449(89)90098-5] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Klinowski J. Hydrothermal Alumination of Zeolites. ACTA ACUST UNITED AC 1989. [DOI: 10.1016/s0167-2991(08)60514-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2023]
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Datka J, Piwowarska Z, Rakoczy J, Sulikowski B. Catalytic and acid properties of pentasil zeolites: Isomerization of o-xylene and alkylation of toluene. ACTA ACUST UNITED AC 1988. [DOI: 10.1016/s0144-2449(88)80308-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Kokotailo G, Fyfe C, Kennedy G, Gobbi G, Strobl H, Pasztor C, Barlow G, Bradley S. Zeolite Structural Investigations by High Resolution Solid State MAS NMR. New Developments in Zeolite Science and Technology, Proceedings of the 7th International Zeolite Conference. Elsevier; 1986. pp. 361-8. [DOI: 10.1016/s0167-2991(09)60894-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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