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Journal articles on the topic 'Tungstophosphoric acid'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

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 (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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2

Bamoharram, Fatemeh F., Ali Ahmadpour, Majid M. Heravi та 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, № 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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3

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 (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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4

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 (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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5

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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6

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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7

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

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8

Vidoeski, Bojan, Svetlana Jovanovic, Ivanka Holclajtner-Antunovic, et al. "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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9

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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10

Srinivasa Rao, B., Yogita, D. Dhana Lakshmi, P. Krishna Kumari та 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, № 14 (2021): 3719–28. http://dx.doi.org/10.1039/d1se00340b.

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11

Holclajtner-Antunović, I., U. B. Mioč, M. Todorović, et al. "Characterization of potassium salts of 12-tungstophosphoric acid." Materials Research Bulletin 45, no. 11 (2010): 1679–84. http://dx.doi.org/10.1016/j.materresbull.2010.06.064.

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12

Kocaman, Elif, Özge Akarçay, Nur Bağlar, Serdar Çelebi, and Alper Uzun. "Isobutene oligomerization on MCM-41-supported tungstophosphoric acid." Molecular Catalysis 457 (October 2018): 41–50. http://dx.doi.org/10.1016/j.mcat.2018.07.013.

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13

Min, Zhen-Li, and Xia-Min Hu. "Tungstophosphoric Acid-Catalyzed Synthesis of Pyrazolones in Water." Asian Journal of Chemistry 25, no. 13 (2013): 7290–92. http://dx.doi.org/10.14233/ajchem.2013.14550.

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14

Caiado, M., A. Machado, R. N. Santos, et al. "Alkoxylation of camphene over silica-occluded tungstophosphoric acid." Applied Catalysis A: General 451 (January 2013): 36–42. http://dx.doi.org/10.1016/j.apcata.2012.11.007.

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15

Patel, Anish, and Anjali Patel. "Nickel exchanged supported 12-tungstophosphoric acid: synthesis, characterization and base free one-pot oxidative esterification of aldehyde and alcohol." RSC Advances 9, no. 3 (2019): 1460–71. http://dx.doi.org/10.1039/c8ra08419j.

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The synthesis and characterization of a bi-functional catalyst consisting of nickel and supported 12-tungstophosphoric acid are reported as well as its application in one pot oxidative esterification of benzaldehyde and benzyl alcohol to benzoate ester.

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16

Juan, Joon Ching, Yarmo Mohd Ambar, and Jing Chang Zhang. "Tungstophosphoric Acid Entrapped on Mesoporous Silica via Sol Gel Technique." Advanced Materials Research 11-12 (February 2006): 69–72. http://dx.doi.org/10.4028/www.scientific.net/amr.11-12.69.

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The heterogeneous 12-tungstophosphoric acid (HPW) catalyst is becoming important in industrial processes for example in esterification reaction. A novel solid acid catalyst of HPW entrapped on mesoporous silica was synthesized by sol gel technique. Neutral template dodecylamine was introduced to obtain mesopores structure catalyst. The physical and chemical properties of the catalyst were characterized by XRD, nitrogen sorption and FTIR. In conclusion, this new type of mesoporous solid acid catalyst is a very promising heterogeneous acid catalyst for esterification reaction involving bulky molecules such as fatty acid.

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17

Holclajtner-Antunović, I. D., A. Popa, D. V. Bajuk-Bogdanović, S. Mentus, B. M. Nedić Vasiljević, and S. M. Uskoković-Marković. "Synthesis and characterization of acid silver salts of 12-tungstophosphoric acid." Inorganica Chimica Acta 407 (October 2013): 197–203. http://dx.doi.org/10.1016/j.ica.2013.07.035.

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18

Anwar, Amin, Ali Abdel-Ghaffar, Sameh Aboul-Fotouh, and Ebeid Fikry. "Surface Studies and Nature of Active Sites of Supported Heteropolyacids as Catalysts in Methanol Dehydration." Collection of Czechoslovak Chemical Communications 59, no. 4 (1994): 820–32. http://dx.doi.org/10.1135/cccc19940820.

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Different amounts of molybdo- and tungstophosphoric acids were supported on α-Al2O3 to get information about their surface and catalytic properties. The surface study revealed that surface area, total pore volume and the mean pore radius decreased as the acid content increased. X-Ray diffraction analysis showed that there is no interaction between the acid and α-Al2O3. Using a continuous flow system, methanol transformation was carried out under atmospheric pressure. Some experiments were made to determine the nature of active centers and reaction mechanism.

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19

Basahel, Sulaiman N., Nesreen S. Ahmed, Katabathini Narasimharao, and Mohamed Mokhtar. "Simple and efficient protocol for synthesis of pyrido[1,2-a]pyrimidin-4-one derivatives over solid heteropolyacid catalysts." RSC Advances 6, no. 15 (2016): 11921–32. http://dx.doi.org/10.1039/c5ra22180c.

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Aluminium exchnaged tungstophosphoric acid salts with Keggin structure (Al<sub>x</sub>H<sub>3−x</sub>PW<sub>12</sub>O<sub>40</sub>) were prepared and used as catalysts to synthesize pyrido[1,2-a]pyrimidines under mild reaction conditions.

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20

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." Materials Science Forum 494 (September 2005): 101–6. http://dx.doi.org/10.4028/www.scientific.net/msf.494.101.

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In our previous work we investigated the conductivity and dielectric relaxation phenomena in heteropoly acids and their salts. In this work, we have studied the conductivity of grains and grain boundaries in compressed powders of 12-tungstophosphoric acid (WPA) salts with univalent and bivalent ions. The method of impedance spectroscopy has been employed in the frequency range from 5 Hz to 500 kHz. We obtained grains and grain boundaries conductivities as well as corresponding activation energies. Grain conductivity in all investigated salts is always higher than the grain boundary conductivity.

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21

Tiwari, Manishkumar S., and Ganapati D. Yadav. "Novel aluminium exchanged dodecatungstophosphoric acid supported on K-10 clay as catalyst: benzoylation of diphenyloxide with benzoic anhydride." RSC Advances 6, no. 54 (2016): 49091–100. http://dx.doi.org/10.1039/c6ra05379c.

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A series of (20% w/w) aluminium exchanged dodeca-tungstophosphoric acids (DTP) (Al<sub>x</sub>-DTP, x = 0.33–1) supported on montmorillonite K-10 clay were synthesized and completely characterized by sophisticated techniques and used in benzoylation of diphenyl oxide.

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22

López-Salinas, E., J. G. Hernández-Cortéz, I. Schifter, et al. "Thermal stability of 12-tungstophosphoric acid supported on zirconia." Applied Catalysis A: General 193, no. 1-2 (2000): 215–25. http://dx.doi.org/10.1016/s0926-860x(99)00431-7.

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23

Jin, Dingfeng, Zhaoyin Hou, Yongming Luo, and Xiaoming Zheng. "Synthesis of dimethyldiphenylmethane over supported 12-tungstophosphoric acid (H3PW12O40)." Journal of Molecular Catalysis A: Chemical 243, no. 2 (2006): 233–38. http://dx.doi.org/10.1016/j.molcata.2005.08.037.

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24

Dec, Steven F., and Andrew M. Herring. "Structure and Dynamics of Disodium Hydrogen 12-Tungstophosphoric Acid." Journal of Physical Chemistry B 108, no. 33 (2004): 12339–51. http://dx.doi.org/10.1021/jp038044s.

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25

Kuang, Wenxing, Alain Rives, Michel Fournier, and Robert Hubaut. "Structure and reactivity of silica-supported 12-tungstophosphoric acid." Applied Catalysis A: General 250, no. 2 (2003): 221–29. http://dx.doi.org/10.1016/s0926-860x(03)00239-4.

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26

Choi, Saemin, Yong Wang, Zimin Nie, Jun Liu, and Charles H. F. Peden. "Cs-substituted tungstophosphoric acid salt supported on mesoporous silica." Catalysis Today 55, no. 1-2 (2000): 117–24. http://dx.doi.org/10.1016/s0920-5861(99)00231-x.

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27

Lesbani, Aldes, Arianti Marpaung, Najma Annuria Fithri, and Risfidian Mohadi. "12-Tungstophosphoric Acid/Silica Catalyst for Oxidation of Benzothiophene." Asian Journal of Chemistry 28, no. 3 (2016): 617–21. http://dx.doi.org/10.14233/ajchem.2016.19435.

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28

Mioc, Ubavka, Marija Todorovic, Snezana Uskokovic-Markovic, Zoran Nedic, and Nada Bosnjakovic. "A spectroscopic investigation of 12-tungstophosphoric acid alkali salts." Journal of the Serbian Chemical Society 65, no. 5-6 (2000): 399–406. http://dx.doi.org/10.2298/jsc0006399m.

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In this paper the latest results of our continuing investigation of heteropoly acids and their salts are reported. Specially attention was paid to the influence of cations on the dynamic equilibrium of protonic species, as well as on the structure of the host lattice itself, i.e., the Keggin anions. The investigations were done by IR and Raman spectroscopy within the range of 1200.40 cm-1.

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29

Pérez, Maria E., Diego M. Ruiz, Juan C. Autino, Mirta N. Blanco, Luis R. Pizzio, and Gustavo P. Romanelli. "Mesoporous titania/tungstophosphoric acid composites: suitable synthesis of flavones." Journal of Porous Materials 20, no. 6 (2013): 1433–40. http://dx.doi.org/10.1007/s10934-013-9729-8.

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30

Keita, B., and L. Nadjo. "High resolution scanning tunneling microscopy imaging of tungstophosphoric acid." Surface Science Letters 254, no. 1-3 (1991): L443—L447. http://dx.doi.org/10.1016/0167-2584(91)90006-d.

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31

B�langer, R., and J. B. Moffat. "Interaction of NO and NO2 on 12-tungstophosphoric acid." Catalysis Letters 32, no. 3-4 (1995): 371–78. http://dx.doi.org/10.1007/bf00813231.

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32

Keita, B., and L. Nadjo. "High resolution scanning tunneling microscopy imaging of tungstophosphoric acid." Surface Science 254, no. 1-3 (1991): L443—L447. http://dx.doi.org/10.1016/0039-6028(91)90621-x.

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33

Pizzio, L. R., C. V. Cáceres, and M. N. Blanco. "Acid catalysts prepared by impregnation of tungstophosphoric acid solutions on different supports." Applied Catalysis A: General 167, no. 2 (1998): 283–94. http://dx.doi.org/10.1016/s0926-860x(97)00328-1.

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34

Khder, Abd El Rahman S., Hassan M. A. Hassan, and M. Samy El-Shall. "Acid catalyzed organic transformations by heteropoly tungstophosphoric acid supported on MCM-41." Applied Catalysis A: General 411-412 (January 2012): 77–86. http://dx.doi.org/10.1016/j.apcata.2011.10.024.

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35

Khder, Abd El Rahman S., Hassan M. A. Hassan, and M. Samy El-Shall. "Metal-organic frameworks with high tungstophosphoric acid loading as heterogeneous acid catalysts." Applied Catalysis A: General 487 (October 2014): 110–18. http://dx.doi.org/10.1016/j.apcata.2014.09.012.

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36

Fiorio, Jhonatan Luiz, Adriano Henrique Braga, Carmen Luísa Barbosa Guedes, and Liane Marcia Rossi. "Reusable Heterogeneous Tungstophosphoric Acid-Derived Catalyst for Green Esterification of Carboxylic Acids." ACS Sustainable Chemistry & Engineering 7, no. 19 (2019): 15874–83. http://dx.doi.org/10.1021/acssuschemeng.9b01579.

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37

Aparicio, M., J. Mosa, M. Etienne, and A. Durán. "Proton-conducting methacrylate–silica sol–gel membranes containing tungstophosphoric acid." Journal of Power Sources 145, no. 2 (2005): 231–36. http://dx.doi.org/10.1016/j.jpowsour.2005.01.071.

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38

Pérez-Maqueda, Luis A., and Egon Matijević. "Preparation of Uniform Colloidal Particles of Salts of Tungstophosphoric Acid†." Chemistry of Materials 10, no. 5 (1998): 1430–35. http://dx.doi.org/10.1021/cm970809j.

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39

Davidović, M., T. Čajkovski, D. Čajkovski, V. Likar-Smiljanić, R. Biljić, and U. Mioč. "Microwave X-band permittivity measurements on 12-tungstophosphoric acid hexahydrate." Solid State Ionics 97, no. 1-4 (1997): 233–38. http://dx.doi.org/10.1016/s0167-2738(97)00041-6.

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40

Mioč, U. B., S. K. Milonjić, D. Malović, et al. "Structure and proton conductivity of 12-tungstophosphoric acid doped silica." Solid State Ionics 97, no. 1-4 (1997): 239–46. http://dx.doi.org/10.1016/s0167-2738(97)00089-1.

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41

Davidović, M., T. Čajkovski, D. Čajkovski, et al. "Dielectric investigation of magnesium salt of 12-tungstophosphoric acid hydrate." Solid State Ionics 125, no. 1-4 (1999): 411–15. http://dx.doi.org/10.1016/s0167-2738(99)00203-9.

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42

Čajkovski, T., M. Davidović, P. Pissis, et al. "Dielectric relaxation spectroscopy of montmorillonite doped with 12-tungstophosphoric acid." Journal of Non-Crystalline Solids 351, no. 33-36 (2005): 2842–48. http://dx.doi.org/10.1016/j.jnoncrysol.2005.05.032.

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43

Hasik, M., W. Turek, E. Stochmal, M. Lapkowski, and A. Pron. "Conjugated Polymer-Supported Catalysts - Polyaniline Protonated with 12-Tungstophosphoric Acid." Journal of Catalysis 147, no. 2 (1994): 544–51. http://dx.doi.org/10.1006/jcat.1994.1171.

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44

Peng, Yanqing, Gonghua Song, and Xuhong Qian. "MICROWAVE-ASSISTED ACETALIZATION OF PENTAERYTHRITOL CATALYZED BY 12-TUNGSTOPHOSPHORIC ACID." Synthetic Communications 31, no. 24 (2001): 3735–38. http://dx.doi.org/10.1081/scc-100108222.

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45

Pingaew, Ratchanok, Supaluk Prachayasittikul, Somsak Ruchirawat, and Virapong Prachayasittikul. "Tungstophosphoric acid catalyzed synthesis of N-sulfonyl-1,2,3,4-tetrahydroisoquinoline analogs." Chinese Chemical Letters 24, no. 10 (2013): 941–44. http://dx.doi.org/10.1016/j.cclet.2013.06.019.

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46

Shaabani, Ahmad, Maryam Behnam, and Ali Hossein Rezayan. "Tungstophosphoric acid (H3PW12O40) catalyzed oxidation of organic compounds with NaBrO3." Catalysis Communications 10, no. 7 (2009): 1074–78. http://dx.doi.org/10.1016/j.catcom.2008.12.059.

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47

Ranga Rao, G., and T. Rajkumar. "Investigation of 12-Tungstophosphoric Acid Supported on Ce0.5Zr0.5O2 Solid Solution." Catalysis Letters 120, no. 3-4 (2007): 261–73. http://dx.doi.org/10.1007/s10562-007-9279-2.

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48

Balaraju, M., P. Nikhitha, K. Jagadeeswaraiah, K. Srilatha, P. S. Sai Prasad, and N. Lingaiah. "Acetylation of glycerol to synthesize bioadditives over niobic acid supported tungstophosphoric acid catalysts." Fuel Processing Technology 91, no. 2 (2010): 249–53. http://dx.doi.org/10.1016/j.fuproc.2009.10.005.

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49

Degirmenci, Levent, Nuray Oktar, and Gulsen Dogu. "ETBE synthesis over silicotungstic acid and tungstophosphoric acid catalysts calcined at different temperatures." Fuel Processing Technology 91, no. 7 (2010): 737–42. http://dx.doi.org/10.1016/j.fuproc.2010.02.007.

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50

Sert, Emine, and Ferhan Sami Atalay. "Esterification of Acrylic Acid with Different Alcohols Catalyzed by Zirconia Supported Tungstophosphoric Acid." Industrial & Engineering Chemistry Research 51, no. 19 (2012): 6666–71. http://dx.doi.org/10.1021/ie202609f.

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