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, conversion of dimethyl ether and carbon monoxide to methyl acetate is investigated over a variety of group VIII metal-substituted phosphotungstic acid salts using rhodium, iridium, ruthenium, and palladium catalysts.
Abstract: Dimethyl ether (DME) can be produced much more efficiently in a single-stage, liquid-phase process from natural gas-based syngas as compared to the conventional process via dehydration of methanol This process, based on dual catalysts slurried in inert oil, alleviates the chemical equilibrium limitation governing the methanol synthesis reaction and concurrently improves per-pass syngas conversion and reactor productivity The potential, therefore, for production of methyl acetate via dimethyl ether carbonylation is of industrial importance In the present study, conversion of dimethyl ether and carbon monoxide to methyl acetate is investigated over a variety of group VIII metal-substituted phosphotungstic acid salts Experimental results of this catalytic reaction using rhodium, iridium, ruthenium, and palladium catalysts are evaluated and compared in terms of selectivity toward methyl acetate The effects of active metal, support types, multiple metal loading, and feed conditions on carbonylation activi
15 citations
TL;DR: In this paper, a glass composite membrane for H 2 /O 2 fuel cell electrolytes was studied with respect to their structural and thermal properties, proton conductivity, pore characteristics, hydrogen permeability, and performance in fuel cell tests.
15 citations
TL;DR: In this article, the utilization of a binary catalyst composed of metal-loaded modified SBA-15 and phosphotungstic acid (H3PW12O40) for ethylene glycol (EG) production from direct catalytic conversion of cellulose was presented.
Abstract: This study presents the utilization of a binary catalyst composed of metal-loaded modified SBA-15 (M/SBA-15) and phosphotungstic acid (H3PW12O40) for ethylene glycol (EG) production from direct catalytic conversion of cellulose M/SBA-15 (M = Ru, Au, Pd, Pt, Rh and Ni) catalysts were prepared using the impregnation method and characterized by means of XRD, N2 physisorption, TEM and H2-temperature-programmed reduction (H2-TPR) techniques Their catalytic performance was then studied in detail on the basis of cellulose conversion and the selectivity of polyols and EG The results showed that the mesoporous structure of the SBA-15 sample was well maintained after the metal-loaded modification, and almost all of the selected catalysts gave about 100% conversion of cellulose However, the selectivity for EG was greatly different Among the various binary catalysts, the combination of Rh/SBA-15 and H3PW12O40 gave the best selectivity to EG (555%), whereas the worst selectivity of EG (11%) was obtained over the Au/SBA-15 and H3PW12O40 system under identical conditions In addition to phosphotungstic acid, other W compounds were also studied in combination with the Ru/SBA-15 catalyst The results showed that the EG selectivity depended on the W compounds as follows: H4SiW12O40 < H2WO4 < H3PW12O40 Therefore, the binary catalyst of Rh/SBA-15 and H3PW12O40 showed the greatest potential for EG production from direct catalytic conversion of cellulose
15 citations
TL;DR: In this article, a new efficient method for α-acyloxyacrylate ester synthesis with a strong inorganic acid, heteropolyacid, is presented, which was carried out in liquid phase under mild conditions and showed higher productivity than that of the conventional synthesis with typical organic acid, p-toluenesulfonic acid.
15 citations
TL;DR: In this article, a composite coating by using polypyrrole as functional component was prepared on the low alloy steel surface, and its anticorrosion properties were investigated by the open circuit potential and EIS.
Abstract: Polypyrrole was prepared by chemical oxidation with ammonium persulfate as the oxidant, phosphotungstic acid as the dopant, and its molecular structure was characterized by FTIR spectrum, X-ray diffraction and EDX. A composite coating by using polypyrrole as functional component was prepared on the low alloy steel surface, and its anticorrosion properties were investigated by the open circuit potential and EIS. The results indicated that the coating contained dopant displayed an excellent anticorrosion property for the low alloy steel.
15 citations