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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Abstract: The catalyst PTA@MIL-101(Fe)–NH2–Cl was synthesized in various solvents to investigate the effect of solvents on the catalyst crystal structure. PTA@MIL-101(Fe)–NH2–Cl can only be obtained in DMF because of its excellent ability to deprotonate the organic ligands and promotion to yield MIL-101 crystals by forming a Cl–H–DMF complex. The water-containing solvents were unfavorable to yield MIL-101 crystals since MIL-101 crystals reorganized and other crystals were formed in this kind of solvents. The metal cation concentration kinetically controlled the crystal structure. MIL-101 crystals were fabricated only at low metal cation concentration. In the DMF synthesis system, the supported phosphotungstic acid (PTA) retained its Keggin structure. The acidity dramatically decreased compared to PTA caused by the double electrostatic interaction of amino groups and positively charged exterior surface of carrier MIL-101(Fe)–NH2–Cl. The roles of both amino groups as PTA immobilization sites and chlorine groups as substrate absorption sites were confirmed in starch hydrolysis catalyzed by PTA@MIL-101(Fe)–NH2–Cl.
13 citations
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TL;DR: In this article, a novel sulfonated polyimide (SPI) membrane embedded with the phosphotungstic acid (PWA) membrane for vanadium redox flow battery (VRB) has been prepared with low capacity loss, low cost, and high capacity.
Abstract: A novel sulfonated polyimide (SPI) membrane embedded with the phosphotungstic acid (SPI/PWA membrane) for vanadium redox flow battery (VRB) has been prepared with low capacity loss, low cost, and h...
13 citations
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14 Sep 2011
TL;DR: In this article, the authors proposed a green method for reclaiming the waste and old carbon fiber reinforced epoxy resin composite material, which consists of the following steps of: adding a catalyst into an organic reagent to prepare supercritical CO2 composite solution; putting the carbon fiber re-inflated epoxy resin composite material to be decomposed into a reaction kettle, and adding the supercritical co 2 composite solution, and reacting for 1 to 24 hours at the temperature of between 100 and 250 DEG C under the pressure of 7.5 to 25.0MPa,
Abstract: The invention relates to a method for reclaiming a carbon fiber reinforced epoxy resin composite material. The conventional method is high in equipment requirement and high in reclamation cost. The method comprises the following steps of: adding a catalyst into an organic reagent to prepare supercritical CO2 composite solution; putting the carbon fiber reinforced epoxy resin composite material tobe decomposed into a reaction kettle, and adding the supercritical CO2 composite solution; and reacting for 1 to 24 hours at the temperature of between 100 and 250 DEG C under the pressure of 7.5 to 25.0MPa, cooling the product to normal temperature, washing and drying the solid product in the product to obtain carbon fibers, and performing reduced pressure distillation on the liquid product in the product to obtain phenol and derivatives thereof. The catalyst is one or two of liquid super acid, solid super acid, phosphotungstic acid, phosphomolybdic acid, acetic acid, formic acid, hydrochloric acid, sulfuric acid and nitric acid. The method has the advantages of high degradation efficiency, environmental friendliness, low cost and the like, and is a green method for reclaiming the waste and old carbon fiber reinforced epoxy resin composite material.
13 citations
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TL;DR: In this article , a simultaneous microwave assisted PTA catalysis (MW-PTAsim) was proposed to improve cellulose accessibility and reactivity in an efficient and convenient way.
13 citations
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TL;DR: In this paper, a composite of BiOBr composites modified with zeolite has been synthesized via impregnation method in which BiObr is the primary light-absorber and phosphotungstic acid acts as an electron accepter.
13 citations