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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.


Papers
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Journal ArticleDOI
TL;DR: In this article, a very stable catalyst, phosphotungstic acid (PTA) encapsulated in metal-organic framework UiO-66, was prepared by a simple one-pot solvothermal method.
Abstract: A very stable catalyst, phosphotungstic acid (PTA) encapsulated in metal–organic framework UiO-66, was prepared by a simple one-pot solvothermal method. Characterization results show that UiO-66 is quite stable in the catalyst preparation process, and PTA is encapsulated in the cavities of UiO-66 with good dispersity. The as-synthesized composite material exhibited good catalytic activity and excellent reusability for the green oxidation of cyclohexanone to adipic acid (AA). Under mild reaction conditions, the isolated yield of AA was as high as 80.3% without the introduction of any organic solvent or phase transfer agent. The excellent immobilization effect of UiO-66 for PTA is mainly because UiO-66 has a well matched window size to confine PTA molecule in its nanocages.

23 citations

Journal ArticleDOI
G. Hudson1
TL;DR: Granules which showed no internum appeared to have a uniform density in unstained material, but after phosphotungstic acid staining, some granules showed a dense peripheral area surrounding a central area of relative electron-transparency.

23 citations

Journal ArticleDOI
Du Yue1, Jiaheng Lei1, Yang Peng1, Junsheng Li1, Xiaodi Du1 
TL;DR: In this paper, a series of meso/macroporous structures with hierarchical mesoporous structure were synthesized by evaporation-induced self-assembly method (EISA), using nonionic surfactant (P123) and polystyrene (PS) spheres as templates.
Abstract: A series of phosphotungstic acid (HPW)/SiO2 materials with hierarchical meso/macroporous structure were synthesized by evaporation-induced self-assembly method (EISA), using nonionic surfactant (P123) and polystyrene (PS) spheres as templates. SEM images displayed uniform macropores with an average pore size of 210 nm. TEM, small-angle XRD and N2 adsorption–desorption isotherms confirmed the existence of the ordered mesoporous structures, embedded in the wall of macropores. The wild-angle XRD and FT-IR spectra proved Keggin-type HPW dispersed homogeneously in the silica framework. With the amount of added PS spheres, the density of the macropores increased, the hierarchically ordered porous HPW/SiO2 possessed two-dimensional (2D) hexagonal (p6mm) mesostructures and uniform periodic macropores. The ODS catalytic activity of these samples were tested, the result showed that the meso/macroporous HPW/SiO2 catalyst with proper PS beads usage displayed much higher catalytic activity than other catalysts. In addition, the reusability of the meso/macroporous HPW/SiO2 catalyst was investigated, the activity of catalyst has not obviously decreased even after eight times.

23 citations

Journal ArticleDOI
15 May 2019-Fuel
TL;DR: In this paper, a task-specific porous ionic polymer (PIP) was designed to act as both of organosulfur adsorbent and catalyst support, resulting in HPW/[PPYX] hybrid catalysts.

23 citations

Journal ArticleDOI
TL;DR: In this article, perovskite-type LaNiO3 nanoparticles were synthesized by an auto-combustion method and coated with a SiO2 shell for the removal of cationic methylene blue and rhodamine B organic dyes from aqueous solutions.

23 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202352
2022121
2021102
2020102
2019115
2018126