Study of catalysts comprising heteropoly acid H3PW12O40 supported on MCM-41 molecular sieve and amorphous silica

Kozhevnikov, I. V.; Kloetstra, K. R.; Sinnema, A.; Zandbergen, H.W.; Bekkum, H. van

doi:10.1016/s1381-1169(96)00328-7

Cited by 340 publications

(183 citation statements)

References 25 publications

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“…For example intense and broad stretching vibrations characteristic for silica framework at ca. 1080, 795 and 467 cm -1 due to t as (Si-O-Si), t s (Si-O-Si) and d (O-Si-O) [15] were observed in the spectrum. These bands, together with two shoulders at about 950 and 550 cm The photodegradation of the MG in a designed photoreactor was performed to estimate the catalytic activity of the synthesized nanocomposites in different loadings (10-30 %).…”

Section: Resultsmentioning

confidence: 90%

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Amine-functionalized nanosilica-supported Dawson heteropolyacid: an eco-friendly and reusable photocatalyst for photodegradation of malachite green

et al. 2014

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Dawson heteropolyacid, H 6 [P 2 W 18 O 62 ], was chemically anchored to the amine-functionalized nanosilica surface in different loadings. The synthesized nanocomposite was characterized by FT-IR spectroscopy and N 2 adsorption experiments. The preservation of the structure of the Dawson and dispersion of the cluster on the support were verified on the basis of the spectroscopic data. The photocatalytic degradation efficiency of the synthesized nanocomposites was studied using an aqueous solution of malachite green dye as a model water pollutant. The mineralization of dye contents was investigated in different loadings from 10 to 30 % at room temperature. Decolorization was observed in shorter time using 30 % loading. The photocatalyst was reusable after the filtration and remained active even after being washed with hot water, which confirm its attachment firmly to the surface of amine-functionalized nanosilica.

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Section: Resultsmentioning

confidence: 90%

“…HPAs, have been immobilized on solid supports, such as amorphous silica, hexagonal silica or MCM-41 [13][14][15][16][17][18].Although there are many types of supports, the common silica type is often employed, due to its availability and chemical stability.…”

Section: Introductionmentioning

confidence: 99%

Amine-functionalized nanosilica-supported Dawson heteropolyacid: an eco-friendly and reusable photocatalyst for photodegradation of malachite green

et al. 2014

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“…O 40 ] were also examined for this reaction, and all were found to give 5a in good-to-excellent yields (entries 6-8). To achieve the coupling reaction with simple reaction procedure, the novel use of HPA supported on silica gel, which is prepared by known method, 156) was demonstrated and gave sufficient yield (entry 9). Additionally, the reaction was carried out in the absence of HPA in wet solvent and also afforded 5a.…”

Section: Efficient Synthesis Of Morphinandienone Alkaloidmentioning

confidence: 99%

Development and Application of New Oxidation Systems Utilizing Oxometalate Catalysts

Hamamoto

2012

CHEMICAL & PHARMACEUTICAL BULLETIN

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This review describes our recent efforts in the development and application of new oxidation systems utilizing oxometalate catalysts. The novel use of heteropoly acid (HPA), an acidic oxometalate catalyst, in hypervalent iodine-mediated oxidations provided an effective strategy to generate cation radical species that enables a variety of direct C-H functionalizations of aromatic compounds. This strategy brought a facile biaryl synthesis and new spirodienone syntheses in aromatic oxidation chemistry. Moreover, this strategy opens up a facile synthetic route to morphinandienone alkaloids. On the other hand, the use of oxometalate catalyst together with poly(N-isopropylacrylamide) (PNIPAAm)-based polymer in the development of new solid-phase catalyst provided a novel reaction system in water. Due to the characteristic temperature-responsive intelligence of PNIPAAm, this reaction system brought a remarkable acceleration of the reactivity and ease of catalyst recovering in catalytic oxidation that uses hydrogen peroxide or oxygen gas (O 2 ) as primary oxidant. In addition, the recovered solid-phase catalyst could be used for consecutive reactions without any significant loss of its catalytic efficacy.

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“…This can be achieved by dispersing the HPAs on solid supports with a high surface area. 10,11 As the sizes of HPA molecules are extremely larger than other typical acidic species, it is assumed that they are much easier to immobilize. Some of the goals of using supported HPAs are the surface area enhancement, higher dispersion of acidic protons, heterogenization and acid strength control.…”

Section: Introductionmentioning

confidence: 99%

Efficient catalytic synthesis of 2-imidazolines and bis-imidazolines with silica supported tungstosilicic acid

Nasr‐Esfahani¹,

Montazerozohori²,

Akhlaghi³

2010

Arkivoc

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Study of catalysts comprising heteropoly acid H3PW12O40 supported on MCM-41 molecular sieve and amorphous silica

Cited by 340 publications

References 25 publications

Amine-functionalized nanosilica-supported Dawson heteropolyacid: an eco-friendly and reusable photocatalyst for photodegradation of malachite green

Amine-functionalized nanosilica-supported Dawson heteropolyacid: an eco-friendly and reusable photocatalyst for photodegradation of malachite green

Development and Application of New Oxidation Systems Utilizing Oxometalate Catalysts

Efficient catalytic synthesis of 2-imidazolines and bis-imidazolines with silica supported tungstosilicic acid

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