Topic
Phosphotungstic acid
About: Phosphotungstic acid is a research topic. Over the lifetime, 1925 publications have been published within this topic receiving 38059 citations. The topic is also known as: Phosphowolframic acid.
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23 Oct 2013
TL;DR: In this paper, the ionic liquid heteropolyacid imidazolium salt catalyst synthesized with a liquid synthesis route has catalytic activity substantially better than that of a heteropoly acid catalyst prepared with a traditional method.
Abstract: The invention relates to a synthesizing method of a heteropolyacid imidazolium salt catalyst. The method belongs to the technical field of chemical synthesis. According to the invention, sodium tungstate and phosphoric acid are adopted as raw materials. Through the steps such as phosphotungstic acid synthesis, sodium ion removing, phosphotungstic acid imidazolium salt preparation, filtering, and spray drying, heteropolyacid imidazolium salt is obtained. The ionic liquid heteropolyacid imidazolium salt catalyst synthesized with a liquid synthesis route has catalytic activity substantially better than that of a heteropolyacid catalyst prepared with a traditional method. At least, the catalyst has an excellent performance in a reaction for synthesizing PTMEG through tetrahydrofuran polymerization.
10 citations
TL;DR: In this paper, a series of heteropolyacid (HPA) catalysts with different supports, in this case SiO2, TiO2 and ZrO 2, and hetero-addenda atoms, were used as catalysts, and their structure-activity correlation in the conversion of dimethyl 2,5-furandicarboxylate to terephthalate was examined based on the density and strength of the acid sites.
10 citations
TL;DR: In this article, a novel Bronsted-Lewis double acidic heteropoly inorganic-organic salt, Mn0.5[MIMPS]2PW12O40, has been synthesized via the replacement of protons in neat phosphotungstic acid by both metal cations Mn2+ and organic intermediate 3-(N-methylimidazole) propane sulfonates, and characterized by Fourier-transform infrared and pyridine adsorption Fourier transform infrared spectroscopy, X-Ray Diffraction, thermal-gravity analysis,
10 citations
10 citations
TL;DR: In this article, the electrical and dielectric properties of polyvinyl alcohol (PVA) and phosphotungstic acid (PTA) composite membranes were investigated as a function of blending composition, crosslinking density, and temperature.
Abstract: The work presents the electrical and dielectric characterization of proton-conducting, chemically-crosslinked nanocomposites of polyvinyl alcohol (PVA) and phosphotungstic acid (PTA). The composite membranes were prepared by in situ crosslinking of the polymer matrix in solution form, containing PTA. The electrical and dielectric properties of the membranes were investigated as a function of blending composition, crosslinking density, and temperature. The conductivity of these membranes shows a temperature dependence of Arrhenius type and highest conductivity of 3.31 × 10−3 S cm−1 was obtained. The activation energies for proton conduction were found to be in the range of 15.28–40.62 kJ mol−1.
10 citations