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: In this article, the catalytic properties of as-synthesized nanocrystalline materials were assessed using a model esterification reaction of acetic acid with 1-propanol.
78 citations
TL;DR: In this paper, an organic/inorganic hybrid membrane consisting of different concentrations of phosphotungstic acid (PWA) in sulfonated poly ether sulfone (SPES) was constructed for the usage as electrolyte in proton exchange membrane fuel cells (PEMFCs).
Abstract: The organic/inorganic hybrid membranes consisting of different concentrations of phosphotungstic acid (PWA) in sulfonated poly ether sulfone (SPES) were constructed for the usage as electrolyte in proton exchange membrane fuel cells (PEMFCs). The repulsion applied between the hydrophilic moieties of host and guest components resulted in the porosity of prepared composite membranes. The as-made membranes demonstrated the prompt thermal stability and validated its applications in elevated temperature operation of PEMFCs. When the concentration of PWA was increased to 30 wt% in sulfonated polyether sulfone, the ionic conductivity of the corresponding membrane was increased to 19 mS/cm at room temperature, presumably due to the inherent conductivity of the PWA molecules and the enhanced acidity of sulfonic acid groups in the membranes. The SPES/PWA composite membrane (IEC 1.74 meq/g) comprising 30 wt% of PWA exhibited a maximum ionic conductivity of 116 mS/cm at 90 °C under 100% relative humidity (RH). The as-made SPES/PWA-30 composite membrane exhibited the maximum PEMFC power density of 305 mW/cm2, which validated its potential applications in PEMFCs.
78 citations
TL;DR: In this paper, an organic/inorganic polymeric hybrid membrane consisting of zirconium oxide and polydimethylsiloxane (PDMS) was synthesized by sol-gel processes.
77 citations
TL;DR: In this paper, the esterification of triethylene glycol (TEG) with methacrylic acid (MAA) was carried out over various solid acid catalysts.
Abstract: The esterification of triethylene glycol (TEG) with methacrylic acid (MAA) was carried out over various solid acid catalysts and the results were compared with conventional acid catalysts. Among the catalysts studied, heteropolyacids showed higher activities than the conventional acids. These were attributed to the acidity of the catalysts. A systematic investigation was carried out for the esterification of triethylene glycol with methacrylic acid over phosphotungstic acid without any free radical inhibitor. The effects of catalyst concentration, alcohol/acid molar ratio and temperature were also studied. Parameters such as activation energy, reaction enthalpy and reaction entropy were derived for the above reaction over phosphotungstic acid in the temperature range of 353–383 K. The obtained results were also compared with silicotungstic acid.
77 citations
TL;DR: In this article, porous coordination polymers (PCPs) modified with sulfonic acid/phosphotungstic acid (PTA) were prepared by hydrothermal method via one-pot self-assembly.
77 citations