Redox behavior and oxidation catalysis of HnXW12O40 (X = Co2+, B3+, Si4+, and P5+) Keggin heteropolyacid catalysts

Choi, Jung Ho; Kang, Tae Hun; Song, Ji Hwan; Bang, Yongju; Song, In Kyu

doi:10.1016/j.catcom.2013.09.015

Cited by 17 publications

(6 citation statements)

References 18 publications

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“…As previously mentioned, all operations were carried out using the same experimental methods and identical active carriers, the only difference was the type of heteropolyanions. Based on the relevant literature, the reducibility of heteropolyacids was dependent on their highest potential value . The higher the potential, the easier it can be oxidized by H 2 O 2 to perform the catalytic function.…”

Section: Results and Discussionmentioning

confidence: 99%

“…Based on the relevant literature, the reducibility of heteropolyacids was dependent on their highest potential value. 40 The higher the potential, the easier it can be oxidized by It was generally supposed that the kinetics of this heterogeneous catalytic degradation obeyed the Langmuir− Hinshelwood mechanism. The kinetic equation can be expressed as 41…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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High-Performance Integrated rGO-[Polymeric Ionic Liquid] [Heteropolyanions] for Catalytic Degradation of Azo Dyes

Zhang

et al. 2023

Langmuir

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Polymeric ionic liquid (such as poly[ViEtIm]Br)-modified reduced graphene oxide (rGO), rGO-poly[ViEtIm]Br, was nominated as an open carrier to construct a degradation platform. The large specific surface of rGO together with the anion-exchange property of poly[ViEtIm]Br terminals led to the wide growth of heteropolyanions (like [PW12O40]3–, [PMo12O40]3–, and [SiW12O40]4–), thus assembling the integrated catalyst rGO-poly[ViEtIm][heteropolyanions]. The grafted poly[ViEtIm]Br provided an anchor point to interlink the polar heteropolyanions and the nonpolar rGO substrate, endowing this graphene-based catalyst with excellent dispersibility. The adequate exposure of heteropolyanions further promoted the decolorization capability during the degradation procedure. Morphology, structure, and properties of materials were confirmed and monitored via transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), ultraviolet–visible (UV–vis) spectroscopy, etc. rGO-poly[ViEtIm][PW12O40] was selected as the optimal catalyst with degradation efficiency toward methyl orange reaching 98.7% in 3 h. In addition, the excellent structural stability of the catalyst improved the decolorization efficiency, which reached 95% after recycling five times.

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Section: Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

High-Performance Integrated rGO-[Polymeric Ionic Liquid] [Heteropolyanions] for Catalytic Degradation of Azo Dyes

Zhang

et al. 2023

Langmuir

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“…Obecně se jedná o polykyseliny, jež jsou tvořeny kondenzací anorganické kyseliny, která se skládá alespoň ze dvou rozdílných kovů [10], vodíku, kyslíku, kovu či nekovu [11]. Obecný vzorec těchto sloučenin je možný zapsat dle Kegginovy struktury H n XM 12 O 40 , kde X je většinou Si, P nebo As; M je zastoupeno Mo nebo W [12][13][14]. HPAs jsou protické kyseliny, ekonomicky atraktivní, ekologicky nezávadné [15] krystalické látky s vysokou rozpustností v polárních rozpouštědlech a s velmi vysokou aciditou [6,16] …”

Section: úVodunclassified

Heteropolyacids like new anticorrosion pigment in organic paints

Nechvílová

Kalendová

2016

Koroze a Ochrana Materialu

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This paper is focused on the heteropoly acids as another new possibility of dopant for conducting polymers which can be used as anticorrosive pigments for steel protection. The newly prepared pigments, silicotungstic and phosphotungstic heteropoly acids, were characterized by determination of oil number and density. The value of critical pigment volume concentration was determinated by these values. The pigment volume concentration was 0.5; 1; 3 and 5 % in epoxyester-resin witch was used as a binder. Organic coatings were applicated on steel panels which were tested by mechanical and corrosion tests. The main exam was exposition of testing sample in sulphur dioxide atmosphere. Another important exam was measuring the specific electrical conductivity and determination of corrosion loss. After 1584 hours, the samples were evaluated. Values of anticorrosion efficiency are increased for silicotungstic heteropoly acid pigment. But with long-term exposition, phosphotungstic heteropoly acid pigment has better and higher anticorrosion efficiency than the other sample.

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“…Several researches on the redox nature of HPAs have been conducted through theoretical and experimental studies such as DFT calculation [4], electrochemical measurement [5][6][7][8], UV-visible spectroscopy [8][9][10], and scanning tunneling microscopy [11]. Due to the diversity of mixed-addenda HPAs, however, much progress has not been made on the redox behavior of Wells-Dawson tungstoarsenates.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical and UV–visible spectroscopy studies of K6As2W18−xMoxO62 (x = 0–3) Wells–Dawson heteropolyacid catalysts for oxidative dehydrogenation of benzyl alcohol

Choi

Kang

Bang

et al. 2014

Catalysis Communications

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Redox behavior and oxidation catalysis of HnXW12O40 (X = Co2+, B3+, Si4+, and P5+) Keggin heteropolyacid catalysts

Cited by 17 publications

References 18 publications

High-Performance Integrated rGO-[Polymeric Ionic Liquid] [Heteropolyanions] for Catalytic Degradation of Azo Dyes

High-Performance Integrated rGO-[Polymeric Ionic Liquid] [Heteropolyanions] for Catalytic Degradation of Azo Dyes

Heteropolyacids like new anticorrosion pigment in organic paints

Electrochemical and UV–visible spectroscopy studies of K6As2W18−xMoxO62 (x = 0–3) Wells–Dawson heteropolyacid catalysts for oxidative dehydrogenation of benzyl alcohol

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