| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Wilson, K.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (11/11 displayed)
- 2018Delaminated CoAl‐Layered Double Hydroxide@TiO₂ Heterojunction Nanocomposites for Photocatalytic Reduction of CO₂
- 2018A magnetically separable SO₄/Fe-Al-TiO₂ solid acid catalyst for biodiesel production from waste cooking oil
- 2016Crystallization and preliminary crystallographic analysis of deoxyuridine 5'-triphosphate nucleotidohydrolase from Bacillus subtilis.citations
- 2014Investigating the structure of biomass-derived non-graphitizing mesoporous carbons by electron energy loss spectroscopy in the transmission electron microscope and X-ray photoelectron spectroscopycitations
- 2009Cs-doped H4SiW12O40 catalysts for biodiesel applicationscitations
- 2006Amine-functionalised hexagonal mesoporous silica as support for copper(II) acetylacetonate catalystcitations
- 2006Covalent attachment of chiral manganese(III) salen complexes onto functionalised hexagonal mesoporous silica and application to the asymmetric epoxidation of alkenescitations
- 2005Asymmetric epoxidation of alkenes by a chiral manganese(III) salen complex anchored onto a functionalised hexagonal mesoporous silica
- 2005Surface modification of bioceramics by grafting of tailored allyl phosphonic acidcitations
- 2005Hybrid Fe3O4 /GaAs (100) structure for spintronics
- 2001Crystallization and preliminary crystallographic analysis of deoxyuridine 5'-triphosphate nucleotidohydrolase from Bacillus subtilis
Places of action
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article
Cs-doped H4SiW12O40 catalysts for biodiesel applications
Abstract
<p>Cs exchanged silicotungstic acid catalysts of general formula Cs<sub>x</sub>H<sub>4-x</sub>SiW<sub>12</sub>O<sub>40</sub> (x = 0.8-4) have been synthesised and characterised by a range of techniques including elemental analysis, N<sub>2</sub> gas adsorption, XRD, XPS and NH<sub>3</sub> flow calorimetry. Cs substitution promotes recrystallisation of the parent H<sub>4</sub>SiW<sub>12</sub>O<sub>40</sub> polyoxometallate to the Cs<sub>4</sub> salt, via a stable intermediate phase formed at compositions between Cs<sub>0.8-2.8</sub>. This recrystallisation is accompanied by a pronounced rise and subsequent fall in porosity, with a maximum mesopore volume obtained for materials containing 2.8 Cs atoms per Keggin unit. Calorimetry reveals all Cs<sub>x</sub>H<sub>4-x</sub>SiW<sub>12</sub>O<sub>40</sub> are strong acids, with ΔH<sup>θ</sup><sub>ads</sub>(NH<sub>3</sub>) ranging from -142 to 116 kJ mol<sup>-1</sup> with increasing Cs content, consistently weaker than their phosphotungstic analogues. Cs<sub>x</sub>H<sub>4-x</sub>SiW<sub>12</sub>O<sub>40</sub> materials are active catalysts for both C<sub>4</sub> and C<sub>8</sub> triglyceride transesterification, and palmitic acid esterification with methanol. For loadings ≤0.8 Cs per Keggin, (trans)esterification activity arises from homogeneous contributions. However, higher degrees of substitution result in entirely heterogeneous catalysis, with rates proportional to the density of accessible acid sites present within mesopores.</p>