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Heterogenization of Heteropolyacid with Metal-Based Alumina Supports for the Guaiacol Gas-Phase Hydrodeoxygenation. Molecules 2023; 28:molecules28052245. [PMID: 36903491 PMCID: PMC10005010 DOI: 10.3390/molecules28052245] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 02/25/2023] [Accepted: 02/27/2023] [Indexed: 03/06/2023] Open
Abstract
Because of the global necessity to decrease CO2 emissions, biomass-based fuels have become an interesting option to explore; although, bio-oils need to be upgraded, for example, by catalytic hydrodeoxygenation (HDO), to reduce oxygen content. This reaction generally requires bifunctional catalysts with both metal and acid sites. For that purpose, Pt-Al2O3 and Ni-Al2O3 catalysts containing heteropolyacids (HPA) were prepared. HPAs were added by two different methods: the impregnation of a H3PW12O40 solution onto the support and a physical mixture of the support with Cs2.5H0.5PW12O40. The catalysts were characterized by powder X-ray diffraction, Infrared, UV-Vis, Raman, X-ray photoelectron spectroscopy and NH3-TPD experiments. The presence of H3PW12O40 was confirmed by Raman, UV-Vis and X-ray photoelectron spectroscopy, while the presence of Cs2.5H0.5PW12O40 was confirmed by all of the techniques. However, HPW was shown to strongly interact with the supports, especially in the case of Pt-Al2O3. These catalysts were tested in the HDO of guaiacol, at 300 °C, under H2 and at atmospheric pressure. Ni-based catalysts led to higher conversion and selectivity to deoxygenated compound values, such as benzene. This is attributed to both a higher metal and acidic contents of these catalysts. Among all tested catalysts, HPW/Ni-Al2O3 was shown to be the most promising, although it suffered a more severe deactivation with time-on-stream.
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Ali NS, Alismaeel ZT, Majdi HS, Salih HG, Abdulrahman MA, Cata Saady NM, Albayati TM. Modification of SBA-15 mesoporous silica as an active heterogeneous catalyst for the hydroisomerization and hydrocracking of n-heptane. Heliyon 2022; 8:e09737. [PMID: 35756106 PMCID: PMC9218147 DOI: 10.1016/j.heliyon.2022.e09737] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2022] [Revised: 05/08/2022] [Accepted: 06/13/2022] [Indexed: 11/16/2022] Open
Abstract
In this study, a mesoporous SBA-15 silica catalyst was prepared and modified with encased 1% platinum (Pt) metal nanoparticles for the hydrocracking and hydroisomerization of n-heptane in a heterogeneous reaction. The textural and structural characteristics of the nanostructured silica, including both encased and non-encased nanoparticles, were measured using small-angle X-ray diffraction (XRD), nitrogen adsorption-desorption porosimetry, Brunauer–Emmett–Teller (BET) surface area analysis, Fourier-transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Catalytic testing was carried out in a plug-flow reactor under highly controlled operating conditions involving the reactant flow rate, pressure, and temperature. Gas chromatography was used to analyze the species as they left the reactor. The results demonstrated that 1% Pt/SBA-15 has a high n-heptane conversion activity (approximately 85%). Based on the results of this experimental work, there is no selectivity in the SBA-15 catalysts for isomerization products because they are inactive at the relatively low temperature that is essential for hydroisomerization. On the other hand, the SBA-15 catalysts have a considerable selectivity for products that have cracks, owing to their ability to withstand extremely high temperatures (300–400 °C) as well as the availability of Lewis acid sites within the catalyst structure.
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Affiliation(s)
- Nisreen S Ali
- Mustansiriyah University, College of Engineering, Materials Engineering Department Baghdad-Iraq, Iraq
| | - Ziad T Alismaeel
- Department of Biochemical Engineering, Al-Khwarizmi College of Engineering, University of Baghdad, Al-Jadryah, 47008, Baghdad, Iraq
| | - Hasan Sh Majdi
- Department of Chemical Engineering and Petroleum Industries, Al-Mustaqbal University College, Babylon 51001, Iraq
| | - Hussein G Salih
- Department of Chemical Engineering, University of Technology- Iraq, 52 Alsinaa St., P.O. Box 35010, Baghdad, Iraq
| | - Mahir A Abdulrahman
- Department of Chemical Engineering, University of Technology- Iraq, 52 Alsinaa St., P.O. Box 35010, Baghdad, Iraq
| | - Noori M Cata Saady
- Department of Civil Engineering, Memorial University of Newfoundland, St. John's, NL A1B 3X5, Canada
| | - Talib M Albayati
- Department of Chemical Engineering, University of Technology- Iraq, 52 Alsinaa St., P.O. Box 35010, Baghdad, Iraq
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Multi-functional Fe-Al0.66DTP/MCF catalyst in cascade engineered synthesis of the drug butamben: Novelty of catalyst, reaction kinetics and mechanism. MOLECULAR CATALYSIS 2020. [DOI: 10.1016/j.mcat.2019.110711] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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4
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Alotaibi A, Bayahia H, Kozhevnikova EF, Kozhevnikov IV. Selective Alkylation of Benzene with Propane over Bifunctional Pt-Heteropoly Acid Catalyst. ACS Catal 2015. [DOI: 10.1021/acscatal.5b01102] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Abdullah Alotaibi
- University of Liverpool, Department of
Chemistry, Liverpool L69 7ZD, U.K
| | - Hossein Bayahia
- University of Liverpool, Department of
Chemistry, Liverpool L69 7ZD, U.K
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n-Butane Isomerization over Silica-Supported Heteropolyacids: Study of Some Parameters. ACTA ACUST UNITED AC 2013. [DOI: 10.1155/2013/828962] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Isomerization of n-butane was studied on silica-supported heteropolyacids. The activity depends strongly on the solvent used for the preparation and on the polyoxometalate loading. This behavior was explained by different proportions of isolated and bulk heteropolyacids. Silicotungstic acid is inherently more selective than phosphotungstic acid. In presence of platinum and hydrogen the catalysts are stable and highly selective (more than 97%) to isobutane. A study as a function of temperature shows that there is an optimal temperature for performing the reaction.
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Eid A, Benlounes O, Hilal HS, Rabia C, Hocine S. Dehydrocyclization of n-Hexane over Heteropolyoxometalates Catalysts. ACTA ACUST UNITED AC 2013. [DOI: 10.4236/aces.2013.31010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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7
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Liu L, Ye XP, Bozell JJ. A comparative review of petroleum-based and bio-based acrolein production. CHEMSUSCHEM 2012; 5:1162-1180. [PMID: 22492577 DOI: 10.1002/cssc.201100447] [Citation(s) in RCA: 85] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2011] [Revised: 12/12/2011] [Indexed: 05/31/2023]
Abstract
Acrolein is an important chemical intermediate for many common industrial chemicals, leading to an array of useful end products. This paper reviews all the synthetic methods, including the former (aldol condensation) and contemporary (partial oxidation of propylene) manufacturing methods, the partial oxidation of propane, and most importantly, the bio-based glycerol-dehydration route. Emphasis is placed on the petroleum-based route from propylene and the bio-based route from glycerol, an abundantly available and relatively inexpensive raw material available from biodiesel production. This review provides technical details and incentives for industrial proyduction that justify a transition toward bio-based acrolein production.
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Affiliation(s)
- Lu Liu
- Department of Biosystems Engineering & Soil Science, University of Tennessee-Knoxville, 2506 E.J. Chapman Drive, Knoxville, TN, USA.
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8
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Intramolecular cyclization of (+)-citronellal using supported 12-tungstophosphoric acid on MCM-41. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.molcata.2012.03.002] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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9
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Abstract
12-tungstophosphoric acid was supported on amine-modified SBA-15 by impregnation. The structure and properties of the catalyst were characterized by FT-IR spectroscopy, X-ray diffraction, N2 adsorption-desorption, TEM,Raman spectra and NH3–TPD technology.the result confirmed the mesostructure for SBA-15 and the Keggin structure of the heteropolyanions was preserved. The tungstophosphoric acid can disperse in the pore of the support SBA-15/NH2, but the acidity of the catalyst reduced. The catalytic activities of the catalysts were evaluated for the esterification reaction of ethyl acetoacetate and ethylene glycol .and the catalysts supported on amine-modified SBA-15 show excellent reusability and selectivity.
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Jansen R, van Veldhuizen H, Schwegler M, van Bekkum H. Recent (1987-1993) developments in heteropolyacid catalysts in acid catalyzed reactions and oxidation catalysis. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/recl.19941130302] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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11
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Mesostructured TUD-1 supported molybdophosphoric acid (HPMo/TUD-1) catalysts for n-heptane hydroisomerization. Catal Today 2009. [DOI: 10.1016/j.cattod.2009.07.017] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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12
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Preparation, Characterization and Catalytic Behavior of 12-Molybdophosphoric Acid Encapsulated in the Supercage of Cs+-exchanged Y Zeolite. Chin J Chem Eng 2009. [DOI: 10.1016/s1004-9541(09)60033-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Mohammadpoor-Baltork I, Moghadam M, Tangestaninejad S, Mirkhani V, Mirjafari A. 12-Tungstophosphoric acid supported on inorganic oxides as heterogeneous and reusable catalysts for the selective preparation of alkoxymethyl ethers and their deprotections under different reaction conditions. Polyhedron 2008. [DOI: 10.1016/j.poly.2008.05.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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14
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Kamala P, Pandurangan A. H3PW12O40 Supported on AlMCM-41 molecular sieves: An effectual catalyst for t-butylation of anisole. CATAL COMMUN 2008. [DOI: 10.1016/j.catcom.2008.05.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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15
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Ajaikumar S, Pandurangan A. Reaction of benzaldehyde with various aliphatic glycols in the presence of hydrophobic Al-MCM-41: A convenient synthesis of cyclic acetals. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.molcata.2008.04.008] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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16
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Llanos A, Melo L, Avendaño F, Montes A, Brito JL. Synthesis and characterization of HPW/MCM-41 (Si) and HPW/MCM-41 (Si/Al) catalysts: Activity for toluene alkylation with 1-dodecene. Catal Today 2008. [DOI: 10.1016/j.cattod.2007.11.051] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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17
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Hydroisomerization of n-heptane over bimetal-bearing H3PW12O40 catalysts supported on dealuminated USY zeolite. ACTA ACUST UNITED AC 2008. [DOI: 10.1007/s11426-008-0009-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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18
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Synthesis, Characterization and Ammoxidation Functionality of Silica Supported Vanadium Incorporated Ammonium Salt of 12-Molybdophosphoric Acid Catalyst. Catal Letters 2007. [DOI: 10.1007/s10562-007-9378-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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19
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Kozhevnikov IV. Fine organic synthesis with the aid of heteropolycompounds. RUSSIAN CHEMICAL REVIEWS 2007. [DOI: 10.1070/rc1993v062n05abeh000028] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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20
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Ranga Rao G, Rajkumar T. Investigation of 12-Tungstophosphoric Acid Supported on Ce0.5Zr0.5O2 Solid Solution. Catal Letters 2007. [DOI: 10.1007/s10562-007-9279-2] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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21
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Synthesis and Characterization of Zirconia Supported Vanadium Incorporated Ammonium Salt of 12-molybdophosphoric Acid Catalyst for Aerobic Oxidation of Benzyl alcohol. Catal Letters 2007. [DOI: 10.1007/s10562-007-9235-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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22
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A Said AEA, Abd El-Wahab MMM, Alian AM. Catalytic performance of Brønsted acid sites during esterification of acetic acid with ethyl alcohol over phosphotungestic acid supported on silica. JOURNAL OF CHEMICAL TECHNOLOGY & BIOTECHNOLOGY 2007; 82:513-523. [DOI: 10.1002/jctb.1704] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
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23
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Gu YB, Wei RP, Ren XQ, Wang J. Cs salts of 12-tungstophosphoric acid supported on dealuminated USY as catalysts for hydroisomerization of n-heptane. Catal Letters 2007. [DOI: 10.1007/s10562-006-9002-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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24
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Rabindran Jermy B, Pandurangan A. Efficient synthesis of diacetal of pentaerythritol under microwave irradiation using heteropoly acid H3PW12O40. CATAL COMMUN 2006. [DOI: 10.1016/j.catcom.2006.03.021] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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25
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Al-MCM-41 as an efficient heterogeneous catalyst in the acetalization of cyclohexanone with methanol, ethylene glycol and pentaerythritol. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.molcata.2006.04.045] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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26
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Catalytic performances of heteropoly compounds supported on dealuminated ultra-stable Y zeolite for liquid-phase esterification. ACTA ACUST UNITED AC 2006. [DOI: 10.1007/s11426-006-0140-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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27
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Caliman E, Dias JA, Dias SC, Prado AG. Solvent effect on the preparation of H3PW12O40 supported on alumina. Catal Today 2005. [DOI: 10.1016/j.cattod.2005.07.102] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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28
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A pronounced catalytic activity of heteropoly compounds supported on dealuminated USY for liquid-phase esterification of acetic acid with n-butanol. Catal Letters 2005. [DOI: 10.1007/s10562-005-5851-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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29
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El-Rayyes AA, Klein UK. Acidity characterization of tungstophosphoric acid supported MCM-41 materials using laser induced fluorescence spectroscopy. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2004.09.015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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30
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Zhu Z, Tain R, Rhodes C. A study of the decomposition behaviour of 12-tungstophosphate heteropolyacid in solution. CAN J CHEM 2003. [DOI: 10.1139/v03-129] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In this paper, the decomposition of H3PW12O40 in aqueous solution or in mixed solutions of waterethanol or wateracetone is investigated by potentiometric titration and 31P NMR. Identification of the products from H3PW12O40 decomposition over a pH range of 112 was achieved using preparation high performance liquid chromatography (Pre-HPLC) combined with IR, UVvis spectroscopy, and inductively coupled plasma atomic emission spectroscopy (ICP). It is found that H3PW12O40 in aqueous solution decomposes in a stepwise fashion with increasing pH, with the following solution compositions: [PW12O40]3 (at pH ~ 1) [Formula: see text] [PW12O40]3 + [P2W21O71]6 + [PW11O39]7 (at pH 2.2) [Formula: see text] [PW12O40]3 + [P2W21O71]6 + [PW11O39]7 + [P2W18O62]6 + [P2W19O67]10 (at pH 3.5) [Formula: see text] [P2W21O71]6 + [PW11O39]7 + [P2W18O62]6 (at pH 5.4) [Formula: see text] [PW9O34]9 (at pH 7.3) [Formula: see text] PO43 + WO42 (pH > 8.3). In the first stages at pH < 8, H3PW12O40 decomposes partially with removal of W=O units. In the second stage at pH > 8, tungstophosphoric completely decomposes to PO43. In contrast, the decomposition of H3PW12O40 is reduced, or the stability of the [PW12O40]3 anion is enhanced, in ethanolwater or acetone solution at pH < 8. Key words: 12-tungstophosphate heteropolyacid, decomposition behaviour, potentiometric titration, 31P NMR, preparation high performance liquid chromatography.
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31
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A study of the stability of tungstophosphoric acid, H3PW12O40, using synchrotron XPS, XANES, hexane cracking, XRD, and IR spectroscopy. J Catal 2003. [DOI: 10.1016/s0021-9517(03)00066-6] [Citation(s) in RCA: 86] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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32
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Liu Y, Murata K, Inaba M, Mimura N. Selective oxidation of propylene to acetone by molecular oxygen over M/2H5−[PMo10V2O40]/HMS (M=Cu2+, Co2+, Ni2+). CATAL COMMUN 2003. [DOI: 10.1016/s1566-7367(03)00057-8] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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34
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Structure, Acidity, and Catalytic Activity of Mesoporous Acid Catalysts for the Gas-Phase Synthesis of MTBE from MeOH and ButOH. J Catal 2002. [DOI: 10.1006/jcat.2002.3629] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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35
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Kaur J, Griffin K, Harrison B, Kozhevnikov I. Friedel–Crafts Acylation Catalysed by Heteropoly Acids. J Catal 2002. [DOI: 10.1006/jcat.2002.3592] [Citation(s) in RCA: 131] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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36
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Wang Y, Liu J, Li W. Synthesis of 2-butoxy ethanol with narrow-range distribution catalyzed by supported heteropolyacids. ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s1381-1169(00)00172-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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37
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38
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Kozhevnikov IV. Catalysis by Heteropoly Acids and Multicomponent Polyoxometalates in Liquid-Phase Reactions. Chem Rev 1998; 98:171-198. [PMID: 11851502 DOI: 10.1021/cr960400y] [Citation(s) in RCA: 1623] [Impact Index Per Article: 62.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ivan V. Kozhevnikov
- Leverhulme Centre for Innovative Catalysis, Department of Chemistry, The University of Liverpool, Liverpool L69 7ZD, UK
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39
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Affiliation(s)
- Noritaka Mizuno
- Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113, Japan
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40
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Soled S, Miseo S, McVicker G, Gates W, Gutierrez A, Paes J. Preparation of bulk and supported heteropolyacid salts. Catal Today 1997. [DOI: 10.1016/s0920-5861(96)00235-0] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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41
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Stability and acidity contributions of heteropolymetalates: a theoretical study of the Keggin and Dawson ions. ACTA ACUST UNITED AC 1997. [DOI: 10.1016/s0968-5677(96)00058-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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42
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43
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Wu Y, Ye X, Yang X, Wang X, Chu W, Hu Y. Heterogenization of Heteropolyacids: A General Discussion on the Preparation of Supported Acid Catalysts. Ind Eng Chem Res 1996. [DOI: 10.1021/ie950473s] [Citation(s) in RCA: 84] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yue Wu
- Changchun Institute of Applied Chemistry, Academia Sinica Changchun, Jilin 130022, People's Republic of China
| | - Xingkai Ye
- Changchun Institute of Applied Chemistry, Academia Sinica Changchun, Jilin 130022, People's Republic of China
| | - Xiangguang Yang
- Changchun Institute of Applied Chemistry, Academia Sinica Changchun, Jilin 130022, People's Republic of China
| | - Xinping Wang
- Changchun Institute of Applied Chemistry, Academia Sinica Changchun, Jilin 130022, People's Republic of China
| | - Wenling Chu
- Changchun Institute of Applied Chemistry, Academia Sinica Changchun, Jilin 130022, People's Republic of China
| | - Yucai Hu
- Changchun Institute of Applied Chemistry, Academia Sinica Changchun, Jilin 130022, People's Republic of China
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44
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45
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Periodic mesoporous materials: synthesis, characterization and potential applications. RECENT ADVANCES AND NEW HORIZONS IN ZEOLITE SCIENCE AND TECHNOLOGY 1996. [DOI: 10.1016/s0167-2991(06)81398-4] [Citation(s) in RCA: 115] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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46
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Samra S, Youssef A, Girgis B. Catalytic Properties of Silica-supported 12-Molybdophosphoric Acid in the Conversion of 2-Propanol. ADSORPT SCI TECHNOL 1995. [DOI: 10.1177/026361749501200303] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
A technical silica gel was impregnated with a solution of the titled heteropoly acid (1–20 w/w%) and calcined at 400, 600 or 800 °C. Dehydration of the alcohol generally increased with the loaded acid, and decreased almost linearly with the reaction temperature (360–260°C). The best alcohol decomposition was achieved over the 600°C-calcined catalysts when over 90% conversion to propene was attained. The apparent activation energies decreased with the degree of loading and attained a value of 22 kJ/mol on the 600°C-calcined 20% HPMo-supported catalyst (half that on the solids calcined at 400°C and 800°C). The catalytic dehydration cannot be described by means of a proton-involved mechanism on the severely treated catalysts at ≥600°C. An outer surface mechanism might be effective involving terminal oxygens and MoV ions.
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Affiliation(s)
- S.E. Samra
- Faculty of Science, Mansoura University, Mansoura, Egypt
| | - A.M. Youssef
- Faculty of Science, Mansoura University, Mansoura, Egypt
| | - B.S. Girgis
- National Research Centre, Dokki, Cairo, Egypt
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Khalil L, Mourad W, Girgis B. Changes in the Surface Area of Silica-supported 12-Molybdophosphoric Acid in Relation to the Degree of Loading and the Calcination Temperature. ADSORPT SCI TECHNOL 1994. [DOI: 10.1177/026361749401100202] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
A technical silica gel (Grace-113) was impregnated with 12-molybdophosphoric solution to attain loadings of 0.72–13.4 wt.%. The air-dried solids were then calcined for 3 h at 400, 600 and 800°C, respectively, followed by determination of their N2 adsorption isotherms. The silica gel was thermally stable and suffered about 15% loss in area at 800°C. The impregnated silicas showed considerable decrease in surface area as a function of their heteropoly acid content. Two processes are suggested as taking part in the modification of pore structure: (1) diffusion of the aqueous heteropoly acid solution and its subsequent deposition; and (2) dissolution of silica gel in the acidic aqueous solution followed by interaction with HPMo to form either molybdosilicate or P–Si exchange products. Correlation with the previously studied catalytic conversion of isopropanol indicated that the activity was independent of the surface area. Catalytic dehydration on the 600°C and 800°C products seems to be associated with silicate, molybdate or MoO3 surface species rather than being due to surface acidity or the extent of the surface area.
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Affiliation(s)
- L.B. Khalil
- Laboratory of Physical Chemistry, National Research Centre, Dokki, Cairo, Egypt
| | - W.E. Mourad
- Laboratory of Physical Chemistry, National Research Centre, Dokki, Cairo, Egypt
| | - B.S. Girgis
- Laboratory of Physical Chemistry, National Research Centre, Dokki, Cairo, Egypt
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Dehydration ofn-butanol over highly dispersed heteropolyacid intercalation compounds. Catal Letters 1993. [DOI: 10.1007/bf00767081] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Misono M. New Catalytic Aspects of Heteropolyacids and Related Compounds - to the Molecular Design of Practical Catalysts. STUDIES IN SURFACE SCIENCE AND CATALYSIS 1993. [DOI: 10.1016/s0167-2991(08)64005-7] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Reactions of alcohols with hydrogen sulfide over zeolites: Part V. The role of Brönsted acid sites in thiols formation — A comparative study of zeolites and heteropoly acids. ACTA ACUST UNITED AC 1992. [DOI: 10.1016/0144-2449(92)90120-e] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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