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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TL;DR: The (C3H7)4N+/PWA catalyst showed a remarkable resistance toward deactivation due to water with only a marginal decrease in conversion (∼3%) compared to other conventional solid acid catalysts like amberlyst-15, H-beta and montmorillonite K-10 as mentioned in this paper.
Abstract: Organic–inorganic hybrid catalyst prepared from organic ammonium salt and heteropoly acid is reported as highly active and selective heterogeneous catalyst for the condensation reaction of glycerol with acetone at room temperature. The product formed during the reaction, solketal is a highly potential compound applied majorly in petroleum and pharmaceutical industries. The (C3H7)4N+/PWA catalyst performed better than other conventional solid acid catalysts like H-beta, amberlyst-15, montmorillonite K-10 and cesium salt of phosphotungstic acid with 94% glycerol conversion and 98% selectivity for solketal. The high activity of (C3H7)4N+/PWA catalyst can be explained by its acidity and pseudo liquid behavior. An independent study on the influence of water on catalyst deactivation was performed by adding a small amount of water (glycerol: water (1:1)) during the reaction. The (C3H7)4N+/PWA catalyst showed a remarkable resistance toward deactivation due to water with only a marginal decrease in conversion (∼3%) compared to other conventional solid acid catalysts like amberlyst-15, H-beta and montmorillonite K-10. (C3H7)4N+/PWA catalyst was truly heterogeneous and showed good reusability for 3 catalyst recycles.
38 citations
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TL;DR: The scattering reflections, the contraction of phosphotungstic acid-treated fibres and the associated changes of the long period, are interpreted on the basis of an eight-stranded unit for the subfibrils.
38 citations
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38 citations
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TL;DR: A new porous glass electrolyte consisting of heteropolyacids, i.e., phosphotungstic acid (PWA) and phosphomolybdic acid, was investigated and was found to yield a remarkably high proton conductivity of 1.014 S cm(-1) at 30 degrees C and 85% relative humidity, the first time such a high Proton Conductivity value has been reported for a heteropolyacid glass membrane.
Abstract: A new porous glass electrolyte consisting of heteropolyacids, i.e., phosphotungstic acid (PWA) and phosphomolybdic acid, was investigated and was found to yield a remarkably high proton conductivity of 1.014 S cm-1 at 30 °C and 85% relative humidity. This is the first time such a high proton conductivity value has been reported for a heteropolyacid glass membrane. The glass was applied as the electrolyte for an H2/O2 fuel cell, and a maximum power density of 41.5 mW/cm2 at 32 °C was attained using this new PWA-containing electrode.
37 citations
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TL;DR: In this paper, a new strategy for the immobilization of iminium organocatalysts through the acid-base assembly of multidentate chiral primary amines and solid polyacids is presented.
37 citations