Direct synthesis of mesoporous H 3 PMo 12 O 40 /SiO 2 and its catalytic performance in oxidative desulfurization of fuel oil

Qiu, Jianghua; Wang, Guanghui; Zhang, Yuqin; Zeng, Danlin; Chen, Yang

doi:10.1016/j.fuel.2015.01.064

Cited by 95 publications

(36 citation statements)

References 28 publications

(24 reference statements)

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“…This phenomenon was also observed by impregnating the heteropolyacid H 3 PW 12 O 40 onto MCM-41 [39] and PMA on mesoporous silica. [40] No crystal diffraction peaks of the MoO 3 phase in PMA/SiO 2 -(E) were found in the XRD patterns despite the fact that it is reflectedi nt he Raman spectra by the band at ñ = 825 cm À1 .T his may be due to the low contentofformed MoO 3 in PMA/SiO 2 -(E) and due to af inely dispersed, small particulate molybdenum oxide structure. According to XRD literature data [41] the most intense diffraction patterns from crystalline molybdenum oxide become noticeable when the Mo loading level of MoO 3 on SiO 2 is increasedt o20wt%.…”

Section: Resultsmentioning

confidence: 93%

“…The TEM data shows that H 3+ +x PMo 12Àx 40 .T he average particles ize is around 2.6 nm for the fresh catalyst and around2 .1 nm for the catalyst after reaction (Figure 4).…”

Section: Resultsmentioning

confidence: 96%

“…Perhaps PMA is highly dispersed on the SiO 2 surface due to the high surface area of these support material. This phenomenon was also observed by impregnating the heteropolyacid H 3 PW 12 O 40 onto MCM‐41 and PMA on mesoporous silica . No crystal diffraction peaks of the MoO 3 phase in PMA/SiO 2 ‐(E) were found in the XRD patterns despite the fact that it is reflected in the Raman spectra by the band at

\overset{ν}{true}

=825 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Catalyst Development for the Synthesis of Ozonides and Tetraoxanes Under Heterogeneous Conditions: Disclosure of an Unprecedented Class of Fungicides for Agricultural Application

Yaremenko

Radulov

Belyakova

et al. 2020

Chemistry A European J

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The catalyst H3+xPMo12−x+6Mox+5O40 supported on SiO2 was developed for peroxidation of 1,3‐ and 1,5‐diketones with hydrogen peroxide with the formation of bridged 1,2,4,5‐tetraoxanes and bridged 1,2,4‐trioxolanes (ozonides) with high yield based on isolated products (up to 86 and 90 %, respectively) under heterogeneous conditions. Synthesis of peroxides under heterogeneous conditions is a rare process and represents a challenge for this field of chemistry, because peroxides tend to decompose on the surface of a catalyst . A new class of antifungal agents for crop protection, that is, cyclic peroxides: bridged 1,2,4,5‐tetraoxanes and bridged ozonides, was discovered. Some ozonides and tetraoxanes exhibit a very high antifungal activity and are superior to commercial fungicides, such as Triadimefon and Kresoxim‐methyl. It is important to note that none of the fungicides used in agricultural chemistry contains a peroxide fragment.

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Section: Resultsmentioning

confidence: 93%

“…The TEM data shows that H 3+ +x PMo 12Àx 40 .T he average particles ize is around 2.6 nm for the fresh catalyst and around2 .1 nm for the catalyst after reaction (Figure 4).…”

Section: Resultsmentioning

confidence: 96%

\overset{ν}{true}

=825 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Catalyst Development for the Synthesis of Ozonides and Tetraoxanes Under Heterogeneous Conditions: Disclosure of an Unprecedented Class of Fungicides for Agricultural Application

Yaremenko

Radulov

Belyakova

et al. 2020

Chemistry A European J

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“…The FT‐IR spectrum of TBA‐Si 2 W 18 Mn 4 showed strong bands at 961, 885 and 736 cm − 1 due to the characteristic absorption of W─O terminal (W&dbond;O t ) and W─O bridging groups (W─O b ─W and W─O c ─W), respectively (Fig. c) . The peaks at 1397 and 1493 cm −1 are assigned to C─H scissoring vibrations of CH 3 ─N + .…”

Section: Resultsmentioning

confidence: 95%

Green and efficient organic–inorganic hybrid nanocatalyst for oxidative desulfurization of gasoline

Rezvani

Aghbolagh

Hosseini‐Monfared

2018

Applied Organom Chemis

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A new organic-inorganic hybrid nanocomposite (TBA-Si 2 W 18 Mn 4 @SAB) was synthesized by supporting quaternary ammonium salt of sandwich-type polyoxometalate (TBA-Si 2 W 18 Mn 4 ) on sodium-activated bentonite (SAB) for catalysing an oxidative desulfurization (ODS) process. The synthesized materials were characterized by means of elemental analysis, 29 Si NMR, Fourier transform infrared and UV-visible spectroscopies, X-ray diffraction and scanning electron microscopy. The proposed ODS process was successfully developed on the basis of the catalytic oxidation of organosulfur compounds using TBA-Si 2 W 18 Mn 4 @SAB as catalyst and CH 3 COOH/H 2 O 2 as oxidizing agent.The removal of the sulfur content of gasoline reached 97% at a temperature of 35°C after 1 h using 0.10 g of the prepared catalyst. Various experiments were conducted to investigate the effects of reaction time, catalyst amount, reaction temperature and catalyst type on sulfur removal efficiency. The heterogeneous TBA-Si 2 W 18 Mn 4 @SAB catalyst was found to be reusable for five times. The obtained data illustrated that the use of the TBA-Si 2 W 18 Mn 4 @SAB/ CH 3 COOH/H 2 O 2 oxidation system could be a convenient strategy for reducing the sulfur content of gasoline fuel under moderate reaction conditions.

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“…To increase their selectivity, catalytic activity and/or stereochemistry in synthetic organic reactions, Lewis acids are further tuned through combination with different ligands to form new custom-designed catalysts based on metal complexes and/or metal salts (Popa et al, 2006;Bordoloi et al, 2007;Rao et al, 2010). The interest in using such catalysts with Lewis acid character for synthetic organic chemistry lies in their versatility in a wide range of reactions, including Diels-Alder cycloadditions, Friedel-Crafts alkyl- ISSN 2053ISSN -2296 # 2018 International Union of Crystallography ations/acylations, aldol condensations, Michael additions, chain isomerizations, or oxidations such as epoxidation and dehydrogenation (Boon et al, 1986;Wang et al, 2001;Pizzio et al, 2003;Chang et al, 2010;Qiu et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Zirconia-supported 11-molybdovanadophosphoric acid catalysts: effect of the preparation method on their catalytic activity and selectivity

Bakkali¹,

Trautwein²,

Alcañiz-Monge³

et al. 2018

Acta Crystallogr C

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The oxidation of adamantane with hydrogen peroxide catalyzed by zirconia‐supported 11‐molybdovanadophosphoric acid is shown to be a suitable green route for the synthesis of adamantanol and adamantanone. This work evaluates how the catalyst activity and selectivity are affected by some of its preparative parameters, such as the method for supporting the catalytically active heteropoly acid over the zirconia matrix or the pretreatments applied to the resulting materials before being used as heterogeneous catalysts. Our results indicate that the most effective catalysts able to maintain their activity after several reaction runs are those prepared by following the sol‐gel route, whereas the most selective catalysts are those obtained by impregnation methods. Moreover, the calcination temperature has also been identified as a relevant parameter influencing the performance of catalysts based on supported heteropoly acids. The increasing catalytic activity observed over several consecutive reaction runs has been attributed to the formation of peroxo derivatives of polyoxometalate clusters at the surface of the catalyst and their accumulation after each reaction cycle.

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Direct synthesis of mesoporous H 3 PMo 12 O 40 /SiO 2 and its catalytic performance in oxidative desulfurization of fuel oil

Cited by 95 publications

References 28 publications

Catalyst Development for the Synthesis of Ozonides and Tetraoxanes Under Heterogeneous Conditions: Disclosure of an Unprecedented Class of Fungicides for Agricultural Application

Catalyst Development for the Synthesis of Ozonides and Tetraoxanes Under Heterogeneous Conditions: Disclosure of an Unprecedented Class of Fungicides for Agricultural Application

Green and efficient organic–inorganic hybrid nanocatalyst for oxidative desulfurization of gasoline

Zirconia-supported 11-molybdovanadophosphoric acid catalysts: effect of the preparation method on their catalytic activity and selectivity

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