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Relevant bibliographies by topics / Heteropoly Acid

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Academic literature on the topic 'Heteropoly Acid'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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Journal articles on the topic "Heteropoly Acid"

1

Todorović, M. R., I. Holclajtner-Antunović, U. B. Mioč, and D. Bajuk-Bogdanović. "Characterization of Insoluble Monovalent K⁺, Tl⁺ and Ag⁺ Salts of 12-Tungstophosphoric Acid." Materials Science Forum 555 (September 2007): 207–12. http://dx.doi.org/10.4028/www.scientific.net/msf.555.207.

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The K3PW12O40, K2.5H0.5PW12O40, K2HPW12O40, KH2PW12O40, Ag3PW12O40 and Tl3PW12O40 salts were synthesized and characterized by thermal analysis, IR and impedance spectroscopy, and SEM. The physicochemical characterization of acid alkaline salts revealed the presence of biphasic mixtures of unreacted heteropoly acid and its neutral salt. The unreacted heteroply acid could be washed away by treating the acid salt with water.

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Timofeeva, M. N. "Acid catalysis by heteropoly acids." Applied Catalysis A: General 256, no. 1-2 (2003): 19–35. http://dx.doi.org/10.1016/s0926-860x(03)00386-7.

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Feofanova, Mariana A., Viktor M. Nikolskiy, Alexander S. Radin, Anatolii A. Krylov, and Yulia A. Malysheva. "APPLICATION OF KEGGIN TYPE PHOSPHOTUNGSTOVANADIC HETEROPOLY ACID AS SENSITIVE MATERIAL FOR CARBON MONOXIDE SENSOR." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 64, no. 2 (2021): 62–65. http://dx.doi.org/10.6060/ivkkt.20216402.6281.

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The possibility of using Keggin-type wolframvanadium heteropoly acid with the formula H5[PW10V2O40] as a sensitive material for the development of thin-film resistometric sensors for carbon monoxide is considered. In order to test the applicability of the selected heteropoly acid to solve the problem, thin films were obtained from an aqueous solution of the above-mentioned heteropoly acid by irrigation. Heteropolyacid films were formed on a dielectric citall substrate with metal interpenetrating nickel electrodes. To determine the sensitivity of a film consisting of heteropolyacid to carbon mo

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Deng, Jun, Xue Jun Zhu, and Shuai Xie. "Preparation and Application of P-Mo-W Heteropoly Acid Catalyst." Advanced Materials Research 838-841 (November 2013): 2374–78. http://dx.doi.org/10.4028/www.scientific.net/amr.838-841.2374.

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the phosphorus-molybdenum-tungsten heteropoly acid catalyst is prepared from such raw materials as phosphoric acid, sodium molybdate, sodium tungstate and characterized by infrared spectrum. Glyoxylic acid is prepared by catalytic oxidation of glyoxal in the presence of the self-prepared heteropoly acid catalyst and oxidizing agent hydrogen peroxide. The impact of catalytic reaction temperature, added catalyst, and use level of the hydrogen peroxide on the reaction for synthesizing the glyoxylic acid is investigated. The results show under such conditions as 4°C temperature, 0.15g catalyst, an

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5

Zhu, Junjie, Takehiko Gotoh, Satoshi Nakai, and Masahiro Sadakane. "Synthesis and Characterization of a Novel Heteropoly Acid/Hydrogel Composite." MATEC Web of Conferences 333 (2021): 11005. http://dx.doi.org/10.1051/matecconf/202133311005.

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Catalysis by Heteropoly acids (HPAs) and polyoxometalates (POMs) having a higher demand worldwide, as it can be designed to accelerate complex reactions and be more environmentally friendly. However, recycling of water-soluble solid catalysts remains a problem. The synthesis of a recyclable composite with catalytic properties is the key to better use of HPAs and POMs. Many researches have mentioned the method of synthesis by immersing a porous carrier in a supported solution. However, the catalytic stabilities of the previously studied composites after multiple uses have rarely been mentioned.

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Zhu, Junjie, Takehiko Gotoh, Satoshi Nakai, and Masahiro Sadakane. "Synthesis and Characterization of a Novel Heteropoly Acid/Hydrogel Composite." MATEC Web of Conferences 333 (2021): 11005. http://dx.doi.org/10.1051/matecconf/202133311005.

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Catalysis by Heteropoly acids (HPAs) and polyoxometalates (POMs) having a higher demand worldwide, as it can be designed to accelerate complex reactions and be more environmentally friendly. However, recycling of water-soluble solid catalysts remains a problem. The synthesis of a recyclable composite with catalytic properties is the key to better use of HPAs and POMs. Many researches have mentioned the method of synthesis by immersing a porous carrier in a supported solution. However, the catalytic stabilities of the previously studied composites after multiple uses have rarely been mentioned.

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Guseinova, E. A., S. E. Yusubova, and B. B. Orujzadeh. "THERMAL ANALYSIS OF THE CATALYTIC SYSTEM OF PHOSFORMOLYBDENIC HETEROPOLY ACID–ALUMINUM OXIDE." Azerbaijan Chemical Journal, no. 1 (March 15, 2022): 22–28. http://dx.doi.org/10.32737/0005-2531-2022-1-22-28.

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The methods of thermal analysis – thermogravimetry, differential thermal analysis – were used to study the catalytic system phosphor-molybdenum heteropoly acid–aluminum oxide. It is shown that the modification of aluminum oxide has a direct effect on the state of the phosphor-molybdenum heteropoly acid. On the surface of ƞ-Al2O3, phosphomolybdic acid is destroyed by interaction with strong Lewis’s acid sites of the carrier, while on γ-Al2O3 it retains the individuality, probably due to multipoint adsorption on weak Bronsted and Lewis acid sites of the oxide

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Shen, Wei Yang, Min Xin Song, Jian Qiu Chen, and Rui Xin Guo. "Phosphotungstic Acid, Silicotungstic Acid and Silicon Tungsten-Cobalt Heteropoly Acid with Bovine Serum Albumin Interaction." Advanced Materials Research 652-654 (January 2013): 722–25. http://dx.doi.org/10.4028/www.scientific.net/amr.652-654.722.

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The interactions of bovine serum albumin (BSA) with phosphotungstic heteropoly acid (PW), silicon tungsten heteropoly acid (SiW) and silicon tungsten-cobalt acid (SiWCo) were studied by fluorescence spectroscopy and UV absorption spectroscopy at Tris buffer solution (pH = 7.40). It was found that the fluorescence quenching of PW, SiW and SiWCo with BSA was static and the binding constant, binding site and the thermodynamic parameters were calculated at 298 and 310K. In addition, the conformations of BSA impacted by PW, SiW and SiWCo were researched using synchronous fluorescence. The results s

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Maznaya, Yu I., and O. V. Zuy. "Chemiluminescent reactions of heteropoly acids and their complexes with cationic surfactants in aqueous solutions and on the cellulose surface." Himia, Fizika ta Tehnologia Poverhni 13, no. 1 (2022): 36–46. http://dx.doi.org/10.15407/hftp13.01.036.

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The properties of heteropoly acids and of their complexes with cationic surfactants at the trace level have been studied by ESR spectroscopy, UV-VIS spectrophotometry, NMR and FTIR spectroscopy, by the method of chemiluminescence analysis applied in aqueous solutions and on the cellulose surface. For elucidation of the mechanism of chemiluminescence reactions of heteropoly acids with luminol kinetic methods, diffuse reflectance spectroscopy and liquid chromatography have been applied. For the first time one-electron reduction of heteropoly acids by luminol was confirmed by registration of diff

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Liu, Zhe Lin, Li Guo Guan, Zong Rui Liu, Mei Chun Bao, and Ling Xu. "Preparation, Characterization of Supported Phosphotungstic Acid HPW-MCM-48 and Photocatalytic Degradation of Aqueous Methyl Orange." Advanced Materials Research 842 (November 2013): 147–50. http://dx.doi.org/10.4028/www.scientific.net/amr.842.147.

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In this paper, heteropoly acids were supported onto mesopore materials MCM-48 with lager surface area and high thermal stability. The supported heteropoly acids catalysts were characterized by FT-IR, XRD, TEM and N2 adsorption-desorption thechniques. In addition, the effects of supported contents of heteropoly acids on degradation rate also had been researched.

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Dissertations / Theses on the topic "Heteropoly Acid"

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Llewelyn, Peter William. "Supported heteropoly acids for acid catalysed reactions." Thesis, Cardiff University, 2011. http://orca.cf.ac.uk/54120/.

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Devassy, B. M. "Acid catalysis using zirconia-supported Keggin heteropoly acids." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2005. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/2465.

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Kaur, Jaspalne. "Friedel-Crafts acylation catalysed by heteropoly acids." Thesis, University of Liverpool, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.272747.

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Alsalme, Ali Mohammed. "Solid acid catalysts based on heteropoly acids for conversion of renewable feedstocks." Thesis, University of Liverpool, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.539488.

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The aim of this work is to investigate homogeneous and heterogeneous catalysis by HPAs for the conversion of renewable feedstocks. This includes the preparation, characterisation and testing of a range of acidic solid materials such as bulk HPAs, CS2.sHo.sPW12040and the acidic composites comprising H3PW12040 (HPW) supported on Nb20s, Zr02 and Ti02. The HPW supported on Ti02, Zr02 and Nb20s were prepared by impregnation method and then characterised regarding their acid properties and the chemical structure of HPA on the catalyst surface, compared to "standard" HPA catalysts such as bulk and si

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Obali, Zeynep. "Heteropolyacid Catalysts For Etherification Of Isoolefins." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1134923/index.pdf.

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Due to the water pollution problems created by MTBE, significant research was focused on the production of alternative oxygenates, such as ethyl tert-butyl ether (ETBE), tert-amyl-methyl-ether (TAME) and tert-amyl-ethyl-ether (TAEE) as octane enhancing gasoline blending components. These oxygenates are expected to improve the burning characteristics of gasoline and reduce exhaust emissions of CO and hydrocarbons. Generally, macroreticular acidic resin catalysts (Amberlyst-15) are used for the etherification reactions between C5 iso-olefins (2M1B/2M2B) and alcohols (ethanol/methanol). But in re

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Alharbi, W. N. "Dehydration of methanol and ethanol in the gas phase over heteropoly acid catalysts." Thesis, University of Liverpool, 2017. http://livrepository.liverpool.ac.uk/3011109/.

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The aim of this thesis is to investigate heterogeneous catalysis for the dehydration of methanol and ethanol at a gas-solid interface over a wide range of solid Brønsted acid catalysts based on Keggin-type heteropoly acids (HPAs), focussing on the formation of dimethyl ether (DME) and diethyl ether (DEE), respectively. The dehydration of methanol to dimethyl ether (DME) was studied over a wide range of bulk and supported HPAs and was compared with the reaction over HZSM-5 zeolites (Si/Al = 10−120). Turnover rates for these catalysts were measured under zero-order reaction conditions. The HPA c

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Dailo, Mark Paul Jimena. "Catalytic Activity of Heteropoly Tungstophosphoric Acid supported on Partially Reduced Graphene Oxide Prepared by Laser and Microwave Irradiation." VCU Scholars Compass, 2014. http://scholarscompass.vcu.edu/etd/3671.

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The solid acid catalyst of the Keggin-type 12-tungstophosphoric acid (H3PW12O40, HPW) is supported on partially reduced graphene oxide (PRGO) nanosheets for acid-catalyzed reactions. HPW is a new class of catalyst with a good thermal stability and high Bronsted acidity in order to replace common mineral acids. However, it has low specific surface area (1-5 m2/g). Therefore, the possibility of PRGO as a catalytic support for HPW is investigated due to its high surface area (2630 m2/g) and good thermal stability. The synthesis of HPW-GO catalyst is prepared using microwave and laser irradiation

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8

Varisli, Dilek. "Kinetic Studies For Dimethyl Ether And Diethyl Ether Production." Phd thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/3/12608731/index.pdf.

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Fast depletion of oil reserves necessitates the development of novel alternative motor vehicle fuels. Global warming problems also initiated new research to develop new fuels creating less CO2 emission. Nowadays, dimethyl ether (DME) and diethyl ether (DEE) are considered as important alternative clean energy sources. These valuable ethers are produced by the dehydration reaction of methanol and ethanol, respectively, in the presence of acidic catalysts. Besides DEE, ethylene which is very important in petrochemical industry, can also be produced by ethanol dehydration reaction. In the first p

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Kozhevnikova, Elena Fedorovna. "Heteropoly acids as catalysts for Fries reaction." Thesis, University of Liverpool, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.408540.

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Alekar, N. "Catalytic studies involving heteropoly acids and related compounds." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2000. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/2283.

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Books on the topic "Heteropoly Acid"

1

1947-, Urabe Kazuo, and Onaka Makoto 1952-, eds. Zeolite, clay, and heteropoly acid in organic reactions. Kodansha, 1992.

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Zeolite, Clay, and Heteropoly Acid in Organic Reactions. VCH Publishing, 1993.

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Book chapters on the topic "Heteropoly Acid"

1

Lavrenc̆ic̆ S̆tangar, U., N. Gros̆elj, U. Opara Kras̆ovec, M. Gabers̆c̆ek, and B. Orel. "Structural and Spectroscopic Studies of Heteropoly Acid in Gel Electrolyte." In Functional Materials. Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527607420.ch77.

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Škipina, B., T. Čajkovski, M. Davidović, D. Čajkovski, V. Likar-Smiljanić, and U. B. Mioč. "Conductivity of Grains and Grain Boundaries in Polycrystalline Heteropoly Acid Salts." In Materials Science Forum. Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-971-7.101.

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3

Wen, Xinrong, and Changqing Tu. "Spectrophotometric determination of penicillamine in pharmaceutical samples by phosphorus molybdenum heteropoly acid." In Advances in Energy Science and Equipment Engineering II. CRC Press, 2017. http://dx.doi.org/10.1201/9781315116174-6.

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4

Herzog, B., M. Wohlers, and R. Schlögl. "An in situ DRIFTS Study of the Active Phase of the Heteropoly Acid Catalyst H4[PVMo11O40] in Oxidation Reactions." In Progress in Fourier Transform Spectroscopy. Springer Vienna, 1997. http://dx.doi.org/10.1007/978-3-7091-6840-0_184.

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Sachdeva, Sonny, John A. Turner, James L. Horan, and Andrew M. Herring. "The Use of Heteropoly Acids in Proton Exchange Fuel Cells." In Structure and Bonding. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/430_2011_45.

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Ferrell, Jack R., and Andrew M. Herring. "Metal Oxides and Heteropoly Acids as Anodic Electrocatalysts in Direct Proton Exchange Membrane Fuel Cells." In ACS Symposium Series. American Chemical Society, 2010. http://dx.doi.org/10.1021/bk-2010-1040.ch011.

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7

Shanbhag, G. V., Ankur Bordoloi, Suman Sahoo, B. M. Devassy, and S. B. Halligudi. "Supported Heteropoly Acids and Multicomponent Polyoxometalates as Eco-Friendly Solid Catalysts for Bulk and Fine Chemicals Synthesis." In Environmentally Benign Catalysts. Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-6710-2_5.

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8

Kozhevnikov, Ivan V. "1.3 Heteropoly Acids as Catalysts for Organic Reactions." In Acid-Base Catalysis II, Proceedings of the International Symposium on Acid-Base Catalysis II. Elsevier, 1994. http://dx.doi.org/10.1016/s0167-2991(08)61796-6.

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"Supported Heteropoly Acid Catalysts for Friedel-Crafts Acylation." In Catalysis of Organic Reactions. CRC Press, 2006. http://dx.doi.org/10.1201/9781420007794-50.

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Griffin, Kenneth, Roger Pr√©t√¥t, Peter Johnston, and Paul A. Schaaf. "Supported Heteropoly Acid Catalysts for Friedel-Crafts Acylation." In Catalysis of Organic Reactions. CRC Press, 2006. http://dx.doi.org/10.1201/9781420007794.ch39.

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Conference papers on the topic "Heteropoly Acid"

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An, Changwei, Kuihong Zhu, Te Wang, and Tong Liu. "Preparation and Properties of Supported Silver Heteropoly Acid." In 10th Academic Conference of Geology Resource Management and Sustainable Development 2022. Aussino Academic Publishing House, 2022. http://dx.doi.org/10.52202/067798-0111.

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Ai, Li-Mei, Feng-Wei He, and Qing-Yin Wu. "Preparation and Characterization of Silica Gels Catalysts Containing Undecatungstocobaltoindic Heteropoly Acid." In 2nd Annual International Conference on Advanced Material Engineering (AME 2016). Atlantis Press, 2016. http://dx.doi.org/10.2991/ame-16.2016.152.

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3

Wen, Xinrong, and Changqing Tu. "Spectrophotometric determination of sulfite in food by silicon molybdenum heteropoly acid." In 2022 Biophysical Society of Guang Dong Province Academic Forum - Precise Photons and Life Health (PPLH 2022), edited by Sihua Yang. SPIE, 2023. http://dx.doi.org/10.1117/12.2673903.

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Maleki, Ali, Jamal Rahimi, and Razieh Firouzi Haji. "Green synthesis of quinazolinone derivatives by using a recyclable heteropoly acid catalyst." In The 21st International Electronic Conference on Synthetic Organic Chemistry. MDPI, 2017. http://dx.doi.org/10.3390/ecsoc-21-04722.

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Huifen, Tan, Wu Yanhui, and Zhang Huimin. "Preparation and properties of molecular sieve supported heteropoly acid-polyimide composite proton exchange membranes." In Environment (ICMREE). IEEE, 2011. http://dx.doi.org/10.1109/icmree.2011.5930904.

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Ren, J. Y., Q. Wang, W. H. Dai, T. Liu, J. S. Yan, and Y. Feng. "The Synthesis of Multi-heteropoly Acid Containing Titanium and Its Application on Esterification Reaction." In The International Workshop on Materials, Chemistry and Engineering. SCITEPRESS - Science and Technology Publications, 2018. http://dx.doi.org/10.5220/0007442406210624.

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Xu, Ling, Hai Yun Yu, Li Mei Duan, and Zong Rui Liu. "Study on Catalytic Performance of Heteropoly Acid Supported on MCM-41 Molecular Sieve in Synthesized of Butyl lactate." In 2015 International Conference on Materials, Environmental and Biological Engineering. Atlantis Press, 2015. http://dx.doi.org/10.2991/mebe-15.2015.11.

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Rui Wang, Tao Ma, Dan Wu, and Korchak Vladimir. "Performance of several Keggin heteropoly acids/salts for adsorption of NOx." In 2011 International Symposium on Water Resource and Environmental Protection (ISWREP). IEEE, 2011. http://dx.doi.org/10.1109/iswrep.2011.5893548.

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Reports on the topic "Heteropoly Acid"

1

Herring, Andrew M., James L. Horan, Niccolo V. Aieta, et al. Novel Approaches to Immobilized Heteropoly Acid Systems for High Temperature, Low Relative Humidity Polymer-Type Membranes - Final Report. Office of Scientific and Technical Information (OSTI), 2012. http://dx.doi.org/10.2172/1040798.

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