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 paper, a novel heterogeneously catalyzed condensation of benzyl alcohol to form anthracene is reported, which involves an orthoalkylation of a surface benzyl oxide species by the benzyl cation from a neighboring benzyl oxoxide to form o -hydroxymethyldiphenylmethane which undergoes cyclodehydration followed by aromatization to yield Anthracene.
31 citations
TL;DR: In this paper, the effect of oxidation state on the photocatalytic activity of the Pt-TiO 2 photocatalyst was investigated and it was determined that treatment with reduced phosphotungstic acid enhanced the reaction rate and selectivity to nitrogen gas.
Abstract: Platinum-modified titanium (IV) oxide (Pt-TiO 2 ) was used to photocatalytically oxidize aqueous ammonia selectively to nitrogen gas. The photocatalyst was solvent deposited on acrylic (PMMA) supports for use in simple distributive reactors. Pt was photodeposited on the titania surface within each reactor with concentrations ranging from 0.4% (w/w) to 5.1% (w/w) Pt. The oxidation state of the deposited Pt was subsequently modified using reduced phosphotungstic acid. Time-dependent kinetic studies were used to demonstrate the effect of oxidation state on the photocatalytic activity of the Pt-TiO 2 . It was determined that treatment with reduced phosphotungstic acid enhanced the reaction rate and selectivity to nitrogen gas of the Pt-TiO 2 photocatalysts. Most significantly, treatment of Pt-TiO 2 with reduced phosphotungstic acid shifts the optimum Pt concentration to higher Pt loadings. The reactor containing 3.2% (w/w) post-treated Pt demonstrated the most favorable combination of NH 3 degradation rate and selectivity to N 2 , resulting in the removal of 28.34% total nitrogen from 1.7 L of a 45.5 ppm NH 3 -N solution within 72 h.
31 citations
TL;DR: In this article, a self-crosslinked sulfonated polyether etherketone membrane (C-SPEEK) was synthesized by Friedel-Crafts alkylation at 130°C with chloromethylated SOPE (SPEEK-Cl).
31 citations
TL;DR: In this article, a new composite materials consisting of phosphosilicate (P2O5-SiO2), phosphotungstic acid (PWA), 3-mercaptopropyltrimethoxysilane (MPTS) and glutaraldehyde (GL) were prepared, and a high proton conductivity of 10−2 S cm−1 was observed at room temperature.
Abstract: New composite materials consisting of phosphosilicate (P2O5-SiO2), phosphotungstic acid (PWA), 3-mercaptopropyltrimethoxysilane (MPTS) and glutaraldehyde (GL) were prepared, and a high proton conductivity of 10−2 S cm−1 was observed at room temperature. By incorporating 3-mercaptopropyltrimethoxysilane (MPTS) and glutaraldehyde (GL) in to the P2O5-SiO2-PWA inorganic matrix, the composites showed high proton conductivity in the range of 10−2–10−1 S cm−1 at 120 °C. The structural formation was confirmed by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and morphological analysis. The thermal properties were investigated by thermogravimetry (TG) and differential thermal analysis (DTA). A new inorganic–organic composite membrane was successfully prepared by a sol–gel process through hydrolysis and condensation of MPTS and tetraethoxysilane (TEOS). These P2O5-SiO2-PWA-MPTS, P2O5-SiO2-PWA-GL and P2O5-SiO2-PWA-MPTS-GL hybrid composite membranes showed high proton conductivities as a function of temperature. Moreover, they were thermally stable in air up to 250 and 300 °C due to the presence of a tolerant inorganic SiO2 framework in the matrix.
30 citations
TL;DR: In this paper, the electrochromic performance of all solid-state cells employing phosphotungstic acid and phosphomolybdic acid was reported, and they employed SnO2 as the viewing electrode and graphite as the back electrode.
Abstract: The electrochromic performance of all solid‐state cells employing phosphotungstic acid and phosphomolybdic acid is reported. These cells employ SnO2 as the viewing electrode and graphite as the back electrode. Diffuse reflectivity changes of ∼50% are readily achieved in ∼10 msec. The cells, in the bleached state, can be made white to red, and become black in the colored state.
30 citations