Relevant bibliographies by topics / Tungstophosphoric acid

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Tungstophosphoric acid'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Tungstophosphoric acid"

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Alharthi, Abdulrahman I. "Simple Protocol for the Knoevenagel Condensation Under Solvent Free Conditions using Tungstophosphoric Acid as Catalyst." Asian Journal of Chemistry 31, no. 10 (August 30, 2019): 2181–84. http://dx.doi.org/10.14233/ajchem.2019.22072.

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The effect of calcination on the performance of tungstophosphoric acid for the product of Knoevenagel condensation was investigated. Substituted aldehydes and dimedone has been used in the presence of calcined tungstophosphoric acid as a heterogeneous catalyst using grinding method at room temperature. The results of reactions revealed that calcined tungstophosphoric acid has superior catalytic activity comparing to non-calcined catalyst in terms of yield and reaction time. Maximum yield of model compound was achieved by using 10 mol% of calcined catalyst in a reaction time that does not exceed 10 min, whereas the yield at same amount of non-calcined catalyst was 86 % in a reaction time of 35 min.
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Bamoharram, Fatemeh F., Ali Ahmadpour, Majid M. Heravi, and Mohammad J. Sane Charkhi. "Bulk and Activated Carbon-Supported Tungstophosphoric Acid as Recyclable and Green Catalyst for One-Pot Synthesis ofβ-Acetamido Ketones and Esters." E-Journal of Chemistry 8, no. 2 (2011): 689–96. http://dx.doi.org/10.1155/2011/741328.

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A rapid and efficient one-pot method for the synthesis ofβ-acetamido ketones/esters has been developed in the presence of bulk tungstophosphoric acid and its supported forms on activated carbon as recyclable and eco-friendly catalysts under refluxing conditions. Supported tungstophosphoric acid catalysts containing the same amount of heteropoly acid yielded much higher conversion than bulk form.
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Alharthi, Abdulrahman I. "Efficient Catalytic Performance of Calcined Tungstophosphoric Acid for the Claisen-Schmidt Condensation under Solvent-Free Reaction." Asian Journal of Chemistry 31, no. 11 (September 28, 2019): 2579–84. http://dx.doi.org/10.14233/ajchem.2019.22219.

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Effect of calcination of tungstophosphoric acid catalyst was evaluated in terms of the synthesis of chalcone derivatives via Claisen-Schmidt condensation using the reaction of acetophenone and several substituted aldehydes. The catalyst was characterized before and after calcination by FT-IR to assess the effectiveness of the synthesis of the desired products. The calcined tungstophosphoric acid catalyst (HPW-CL) showed a better performance and high yield of Claisen-Schmidt products in a short period of time. It was also found out that the calcined tungstophosphoric acid provides a chemo selective, efficient and environmentally benign synthesis of chalcone in an excellent yield in a solvent-free system.
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Jafarzadeh, Mohammad, Kamal Amani, and Farzad Nikpour. "Effective and regioselective iodination of arenes using iron(III) nitrate in the presence of tungstophosphoric acid." Canadian Journal of Chemistry 83, no. 10 (October 1, 2005): 1808–11. http://dx.doi.org/10.1139/v05-187.

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An easy, cheap, and effective method for iodination of various aromatic compounds takes place with molecular iodine and iron nitrate nonahydrate as the oxidant in the presence of a catalytic amount of tungstophosphoric acid in dichloromethane, with good yield and high regioselectivity under very mild conditions.Key words: iodination, arenes, iodine, iron(III) nitrate, tungstophosphoric acid.
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Guo, Hong Qi, Gong Yan, Ming Qing Chen, and Shi Rong Liu. "Assembling of 12-Tungstophosphoric Acid into Amino-Modified SBA-15 and its Catalytic Performance." Advanced Materials Research 465 (February 2012): 224–28. http://dx.doi.org/10.4028/www.scientific.net/amr.465.224.

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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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Yang, Kai-Li, Shan Huang, Hu Pan, Heng Zhang, Xiao-Fang Liu, and Song Yang. "Polyoxometalate-MgF2 hybrids as heterogeneous solid acid catalysts for efficient biodiesel production." RSC Advances 7, no. 53 (2017): 33335–43. http://dx.doi.org/10.1039/c7ra06080g.

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Dias, José A., John P. Osegovic, and Russell S. Drago. "The Solid Acidity of 12-Tungstophosphoric Acid." Journal of Catalysis 183, no. 1 (April 1999): 83–90. http://dx.doi.org/10.1006/jcat.1998.2389.

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Vidoeski, Bojan, Svetlana Jovanovic, Ivanka Holclajtner-Antunovic, Danica Bajuk-Bogdanovic, Milica Budimir, Zoran Markovic, and Biljana Todorovic-Markovic. "Raman study of the interactions between highly ordered pyrolytic graphite (HOPG) and polyoxometalates: The effects of acid concentration." Journal of the Serbian Chemical Society 81, no. 7 (2016): 777–87. http://dx.doi.org/10.2298/jsc160301055v.

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Heteropoly acids (HPAs) found wide applications, such as in catalysis, energy conversion and storage, analytical chemistry, clinical medicine, materials science and others, but because of their low surface area and high solubility in water their use is limited. One of the possible ways to overcome these obstacles is to use height specific surface area support for HPAs, such as carbon nanomaterials. Raman spectroscopy was applied for studying study interaction between HPAs and highly ordered pyrolytic graphite (HOPG) as a model of a support. HOPG was exposed to two different HPAs: 12-tungstophosphoric acid and 12-molybodphosphoric acid, at different concentrations. It was noticed that 12-molybodphosphoric acid has stronger effects on HOPG structure causing a weak doping and increase of structural disorder. It is supposed that HOPG interacts with especially external oxygen atoms of 12-molybodphosphoric acid. Atomic force microscopy showed that surface roughness of HOPG treated with 12-molybodphosphoric acid increases with increase of acid concentration, while in the case of HOPG exposed to 12-tungstophosphoric acid the surface roughness is not concentration dependent. The growth trend in measured surface roughness (RMS) is in the agreement with the changes in the intensity ratio ID/IG obtained from Raman spectra of HOPG samples treated with 12-molybdophosphoric acid.
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Che, Penghua, Fang Lu, Xiaoqin Si, and Jie Xu. "Catalytic etherification of hydroxyl compounds to methyl ethers with 1,2-dimethoxyethane." RSC Advances 5, no. 31 (2015): 24139–43. http://dx.doi.org/10.1039/c4ra15919e.

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Srinivasa Rao, B., Yogita, D. Dhana Lakshmi, P. Krishna Kumari, and N. Lingaiah. "Influence of metal oxide and heteropoly tungstate location in mesoporous silica towards catalytic transfer hydrogenation of furfural to γ-valerolactone." Sustainable Energy & Fuels 5, no. 14 (2021): 3719–28. http://dx.doi.org/10.1039/d1se00340b.

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Dissertations / Theses on the topic "Tungstophosphoric acid"

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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 without using any chemical reducing agents. The HPW-GO catalysts are characterized by Ultraviolet-visible spectroscopy (UV-Vis), Fourier Transform Infrared Spectroscopy (FT-IR), Raman Spectroscopy, X-ray Photoelectron Spectroscopy (XPS), X-ray Diffraction (XRD) techniques, and Transmission Electron Microscopy (TEM). Also, the surface acidity is measured by a non-aqueous titration of n-butyl amine. Furthermore, the application for catalysts is tested by three acid-catalyzed reactions: Esterification, Friedel-Crafts acylation, and Pechmann condensation. The greatest acidity for the microwave irradiation method is with the loading of 85 wt% HPW-GO and 60wt% HPW-GO for laser irradiation. The results observed provide an excellent opportunity for PRGO as a catalytic support for HPW for acid-catalyzed reactions.
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Aydemir, Bugce. "Synthesis Of Mesoporous Catalysts And Their Performance In Pyrolysis Of Polyethylene." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612830/index.pdf.

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Plastic materials are widely used throughout the world due to their low prices and easy processing methods. A serious problem of environmental pollution is brought with the widespread use of these materials due to their non-biodegradabilty. For this reason, plastic materials are degraded into lower molecular weight liquid and gaseous products which are potential raw materials and fuels for petrochemical industry. The use of catalysts enhances the formation of more valuable hydrocarbons at lower reaction temperatures and residence times. In this study, aluminum containing MCM-41 and tungstophosphoric acid (TPA) loaded SBA-15 materials were synthesized by impregnation of Al and TPA into hydrothermally synthesized MCM-41 and SBA-15, respectively to be used in catalytic degradation of polyethylene. Al was incorporated into MCM-41 framework with different Al/Si ratios using aluminum triisopropylate as the aluminum source and TPA was incorporated to the porous framework of SBA-15 with different W/Si ratios, using tungstophosphoric acid hydrate as the acid source. From XRD analysis, it was observed that introducing acidic compounds did not cause deformations in the regularity and by EDS analysis, it was found out that at lower loadings, acidic compounds were introduced more effectively for MCM-41 materials. Nitrogen adsorption-desorption isotherms showed that the synthesized materials exhibited type IV isotherms. SEM and TEM pictures showed the hexagonal regularly ordered structure of SBA-15 and MCM-41 materials. FTIR analysis of the pyridine adsorbed synthesized materials revealed the existence of Lewis and Brø
nsted acid sites in the synthesized materials. From TGA analysis it was observed that aluminum impregnated MCM-41 samples reduced the temperature of the degradation reaction significantly and TPA loaded SBA-15 samples reduced activation energy of the reaction effectively. In the degradation reaction system, non-catalytic and catalytic degradation experiments of polyethylene were performed. In non-catalytic degradation and catalytic degradation reactions carried out using aluminum containing MCM-41 materials, selectivity of C3 and C4 hydrocarbon gases was high and in catalytic degradation reactions carried out using TPA impregnated SBA-15 materials, selectivity of ethylene was high. In the liquid analysis of non-catalytic degradation reactions, it was observed that the product distribution was mainly composed of hydrocarbons greater than C18. The use of aluminum loaded MCM-41 and TPA loaded SBA-15 materials resulted in a liquid product distribution in the range of C5-C14, which is the hydrocarbon range of gasoline fuel.
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Lewis, Richard J. "The application of Cs-exchanged tungstophosphoric acid as an additive in the direct synthesis of hydrogen peroxide and the use of Au-Pd/TS-1 in a one-pot approach to cyclohexanone oxime production." Thesis, Cardiff University, 2016. http://orca.cf.ac.uk/95334/.

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The work presented within this thesis can be separated into two distinct parts. The first investigates the direct synthesis of hydrogen peroxide from molecular hydrogen and oxygen using gold-palladium supported catalysts and caesium exchanged tungstophosphoric acid as an acidic additive. The direct synthesis of H2O2 presents an environmentally friendly alternative to the current industrial, anthraquinone process. However for the direct route to be viable a variety of issues must be addressed. Primarily catalytic selectivity towards H2O2 is a major concern for the majority of catalysts active for H2O2 synthesis, with the degradation of H2O2 through hydrogenation or decomposition reported for a number of catalysts within the literature. The use of acid either during catalyst preparation or as part of the reaction solution has previously been shown to improve selectivity towards H2O2. Furthermore acidic supports, including heteropolyacid, have been observed to produce catalysts with greater selectivity than those with a higher isoelectric point and in turn provide higher yields of H2O2. This work investigates the ability of caesium exchanged heteropolyacids to improve catalytic activity towards H2O2 when used in addition to Au-Pd supported catalysts, in particular 2.5 wt. % Au - 2.5 wt. Pd/TiO2. The second part of this work is concerned with the ammoximation of cyclohexanone to cyclohexanone oxime via the in-situ formation of H2O2, in a one-pot style process. The conditions associated with ammoximation of cyclohexanone that is the presence of elevated temperatures and basic conditions, are considered extremely harsh for H2O2 stability. The in-situ generation of H2O2 during the ammoximation of cyclohexanone to cyclohexanone oxime would yield significant reductions in overall costs of the ammoximation reaction. Primarily these costs are associated with the purchasing, transport, storage and dilution of H2O2. This work determines the feasibility of a one-pot ammoximation process via in-situ H2O2 formation. Firstly, reaction conditions are established for this process and following this the role of catalyst design in improving selectivity towards cyclohexanone oxime as well as cyclohexanone conversion for this reaction is studied.
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"BIODIESEL PRODUCTION USING SUPPORTED 12-TUNGSTOPHOSPHORIC ACID AS SOLID ACID CATALYSTS." Thesis, 2014. http://hdl.handle.net/10388/ETD-2014-12-1875.

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Biodiesel has achieved worldwide recognition for many years due to its renewability, lubricating property, and environmental benefits. The abstract represents a summary of all the chapters of the thesis. The research chapters are defined as research phases in the abstract. The thesis starts with an introduction followed by literature review. In the literature review, all the necessary data were collected reviewing the literature. Then an artificial neural network model (ANN) was built based on the published research data to capture the general trends or to make predictions. Both catalyst properties and reaction conditions were trended and predicted using the network model. The review study revealed that esterification and transesterification required catalysts with slightly different properties. In the first phase of the study, biodiesel production using 12-Tungstophosphric acid (TPA) supported on SBA-15 as a solid acid catalyst was studied. In this phase of the study, a large number of 0-35% TPA on SBA-15 catalysts were synthesized by impregnation method and the effects of various operating conditions such as–catalyst wt.% and methanol to oil molar ratio on the transesterification of model feedstock Triolein were studied. A 25% TPA loading was found to be the optimum. A 4.15 wt.% catalysts (based on Triolein) and 39:1 methanol to Triolein molar ratio was found to be the optimum reaction parameter combination, when the reaction temperature was kept fixed at 200C, stirring speed of 600 rpm and 10 h reaction time. The biodiesel yield obtained using this condition was 97.2%. In the second phase of the study, a 12-Tungstophosphoric acid (TPA) was supported by using organic functional group (i.e. 3-aminopropyltriethoxysilane (APTES)) and was incorporated into the SBA-15 structure. A 45 wt.% TPA incorporated SBA-15 produced an ester with biodiesel yield of 97.3 wt.%, when 3 wt.% catalyst (based on the green seed canola (GSC) oil) and 25.8:1 methanol GSC oil molar ratio were used at 2000C for reaction time of 6.2 h. In the third phase, process sustainability (i.e. process economics, process safety, energy efficiency, environmental impact assessment) studies were conducted based on the results obtained in phase three. Based on the study, it was concluded that heterogeneous acid catalyzed process had higher profitability as compared to the homogeneous acid catalyzed process. Additionally, it was obtained that heterogeneous acid catalyzed process was safe, more energy efficient and more environment friendly than homogenous process. In the fourth phase, the catalytic activity of Tungsten oxide (WO3) and TPA supported (by impregnation) on H-Y, H-β and H-ZSM-5 zeolite catalysts were tested for biodiesel production from Green Seed Canola (GSC) oil. In this phase of the study, TPA/H-Y and TPA/H- zeolite were proved to be effective catalysts for esterification and transesterification, respectively. A 55% TPA/H- showed balanced catalytic activity for both esterification and transesterification. It yielded 99.3 wt.% ester, when 3.3 wt.% catalyst (based on GSC oil) and 21.3:1 methanol to GSC oil molar ratio were used at 200C, reaction pressure of 4.14 MPa and reaction time of 6.5 h. Additionally, this catalyst (55% TPA/H-) was experimented for etherification of pure glycerol, and maximum conversion of glycerol (100%) was achieved in 5 h at 120C, 1 MPa, 1:5 molar ratio (glycerol: (tert-butanol) TBA), 2.5% (w/v) catalyst loading. Later, these conditions were used to produce glycerol ether successfully from the glycerol derived after transesterification of green seed canola oil. A mixture of GSC derived biodiesel, and glycerol ether was defined as biofuels. In the fifth phase, catalytic activity of H-Y supported TPA (using different impregnation methods) was studied in details further for esterification of free fatty acid (FFA) of GSC oil. From the optimization study, 97.2% FFA (present in the GSC oil) conversion was achieved using 13.3 wt.% catalyst, 26:1 methanol to FFA molar ratio at 120°C reaction temperature and 7.5 h of reaction time.In the sixth- and final phase, techno-economic and ecological impacts were compared between biodiesel and combined biofuel production processes based on the results obtained in phase four. Based on the study, it was concluded that, biodiesel production process had higher profitability as compared to that for combined biofuel production process. Additionally, biodiesel production process was more energy efficient than combined biofuel production process. However, combined biofuel production process was more environment-friendly as compared to that for biodiesel production process.
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Book chapters on the topic "Tungstophosphoric acid"

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Wang, Yong, Anthony Y. Kim, X. Shari Li, Li-Qiong Wang, Charles H. F. Peden, and Bruce C. Bunker. "Shape-Selective Solid Acid Catalysts Based on Tungstophosphoric Acid Supported on Mesoporous Silica." In ACS Symposium Series, 353–68. Washington, DC: American Chemical Society, 1999. http://dx.doi.org/10.1021/bk-2000-0738.ch025.

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Caiado, M., D. S. Pito, and J. E. Castanheiro. "Alkoxylation of Terpenes over Tungstophosphoric Acid Immobilised on Silica Support." In Environmentally Benign Catalysts, 153–64. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-6710-2_7.

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Kuang, Wenxing, Alain Rives, Michel Fournier, and Robert Hubaut. "Solid State NMR Studies and Reactivity of Silica-Supported 12-Tungstophosphoric Acid." In Magnetic Resonance in Colloid and Interface Science, 565–69. Dordrecht: Springer Netherlands, 2002. http://dx.doi.org/10.1007/978-94-010-0534-0_55.

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Dias, José Alves, Sílvia Cláudia Loureiro Dias, and Julio Lemos de Macedo. "Effect of Acidity, Structure, and Stability of Supported 12-Tungstophosphoric Acid on Catalytic Reactions." In Environmentally Benign Catalysts, 165–87. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-6710-2_8.

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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." In Materials Science Forum, 207–12. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-441-3.207.

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Lingaiah, N., K. T. Venkateswara Rao, and P. S. Sai Prasad. "Vanadium-Substituted Tungstophosphoric Acid Supported on Titania: A Heterogeneous Catalyst for Selective Oxidative Cleavage of Olefins to Carbonyl Compounds at Room Temperature." In Environmentally Benign Catalysts, 91–104. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-6710-2_4.

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Uskoković-Marković, S., Philippe Colomban, U. B. Mioč, and M. R. Todorović. "Investigation of (PO4)/(WO6)3 - Lattice Components of Keggin`s Anion Interaction with Cations in Alkaline-Earth Salts of 12-Tungstophosphoric Acid." In Materials Science Forum, 201–6. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-441-3.201.

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He, Nongyue, Chun Yang, Chang-Soo Woo, and Ho-In Lee. "Immobilization of tungstophosphoric acid in mesoporous silica." In Nanoporous Materials IV, Proceedings of the 4th International Symposium on Nanoporous Materials, 177–82. Elsevier, 2005. http://dx.doi.org/10.1016/s0167-2991(05)80205-8.

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Shevchenko, T. V., N. I. Sushko, and O. N. Tretinnikov. "DICHROIC POLARIZING FILMS BASED ON POLY(VINYL ALCOHOL)-TUNGSTOPHOSPHORIC ACID NANOCOMPOSITES." In Physics, Chemistry and Application of Nanostructures, 319–22. WORLD SCIENTIFIC, 2017. http://dx.doi.org/10.1142/9789813224537_0074.

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Pizzio, Luis R., Carmen V. Cáceres, and Mirta N. Blanco. "Tungstophosphoric acid immobilized in polyvinyl alcohol hydrogel beads as heterogeneous catalyst." In Studies in Surface Science and Catalysis, 731–38. Elsevier, 2000. http://dx.doi.org/10.1016/s0167-2991(00)80716-8.

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Conference papers on the topic "Tungstophosphoric acid"

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Chen, Yunping, Renjin Gao, and Ting Chen. "Oxidation degradation of enzymatic hydrolysis lignin by tungstophosphoric acid catalysis." In 2011 International Conference on Remote Sensing, Environment and Transportation Engineering (RSETE). IEEE, 2011. http://dx.doi.org/10.1109/rsete.2011.5965967.

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Banerjee, Soma, and Kamal K. Kar. "Synergistic effect of tungstophosphoric acid and aluminium phosphate nanoparticles on physicochemical properties of sulfonated poly ether ether ketone polymer electrolyte membrane." In Proceedings of the International Conference on Nanotechnology for Better Living. Singapore: Research Publishing Services, 2016. http://dx.doi.org/10.3850/978-981-09-7519-7nbl16-rps-168.

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