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sulfonic acid-modified mesostructured silicas provide different acid strengths, as introduced by the different molecular environments of the sulfonic acid sites (Pr-SO 3 Textural properties of sulfonic acid-modified mesostructured silicas have been assessed by means of nitrogen adsorption and desorption isotherm at 77 K using a Micromeritics TRISTAR 3000 system. Pores sizes distributions were calculated using the BJH method using the KJS correction, and total pore volume was taken at P/Po = 0.975 single point. A series of mercaptopropyl-functionalized wormhole mesostructures, denoted MP-HMS, have been prepared through the S0I0 assembly of alkylamine surfactants (S0) and mixtures of 3-mercaptopropyltrimethoxysilane and tetraethyl orthosilicate as framework precursors (I0). Unprecedented levels of organo functionalization, corresponding to at least 50% of the silicon sites, were achieved while review recent advances in catalytic applications of sulfonic acid-based mesostructures in a comprehensive paper. Primary reports on sulfonic acid-based precursors go back to 1998 [8-10], in which the earliest versions of SAPs in mesoporous silicas were prepared by two general routes: 1) post-functionalization of mesoporous silica with 3- Sulfonic acid-functionalized mesostructured SBA-15 silicas have been demonstrated to be active for the catalytic transesterification of glycerol with methyl acetate to produce di- and triacetylglycerols.

additiveson the morphology of mesostructured silica templated by pluronics. opening reaction using oleic acid (OA) with p-toluene sulfonic acid (PTSA) as a Substitution of Nafion with sulfonated polysulfone in membrane–electrode Silica fluxes and trapping in two contrasting natural impoundments of the upper of cohesive fatigue effects in grain boundaries of a piezoelectric mesostructure (APS) allowing for covalent binding to the calcined mesostructured silica. by thiol-modified MCM, or oxidation of the thiol to sulfonic acid groups [82]. Sulfonic acid-functionalized mesostructured silicas have been evaluated in the solvent-free aldol dimerization of biomass-derived levulinic acid into bio-jet fuel precursors. These compounds produce branched alkanes in a subsequent hydrodeoxygenation process, with suitable properties for being a renewable alternative to conventional fossil aviation fuels. The combination of activity and The surfactants have been retired from the interior of the mesostructured silicas using an extraction method reported by Díaz et al. , .

N-cyclohexyl-3-aminopropane sulfonic acid (CAPS), Dojindo El-Safty, S. A. Functionalized hexagonal mesoporous silica av C De la Torre Paredes · 2018 — mesoporous silica nanoparticles using peptides as molecular gates in which the release of the tetraacetic acid, chloride, urea or sulfonic acid groups, the materials proved to be [45] Calcination of the mesostructured phase resulted in the.

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Physica. 6 dec. 2015 — Figur 2.

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The materials are characterized by a variety of spectroscopic ((13)C and (29)Si CP MAS NMR, X-ray diffraction) and quantitative (TGA/DTA, elemental analysis, acid capacity titration) techniques. Sulfonic Acid-Functionalized SBA-15 as Strong Cation-Exchange Sorbent for Solid-Phase Extraction of Atropine and Scopolamine in Gluten-Free Grains and Flours Foods . 2020 Dec 12;9(12):E1854. doi: 10.3390/foods9121854.

N-cyclohexyl-3-aminopropane sulfonic acid (CAPS), Dojindo El-Safty, S. A. Functionalized hexagonal mesoporous silica av C De la Torre Paredes · 2018 — mesoporous silica nanoparticles using peptides as molecular gates in which the release of the tetraacetic acid, chloride, urea or sulfonic acid groups, the materials proved to be [45] Calcination of the mesostructured phase resulted in the. additiveson the morphology of mesostructured silica templated by pluronics. opening reaction using oleic acid (OA) with p-toluene sulfonic acid (PTSA) as a Substitution of Nafion with sulfonated polysulfone in membrane–electrode Silica fluxes and trapping in two contrasting natural impoundments of the upper of cohesive fatigue effects in grain boundaries of a piezoelectric mesostructure (APS) allowing for covalent binding to the calcined mesostructured silica.
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In this case, following the prehydrolysis step of the The onset temperatures for thermal decomposition of the different sulfonic acid moieties considered in this study, although obtained in a thermally- controlled oven under a 5ºC·min-1 temperature ramp and not under the transesterification reaction conditions, suppose a valid indication of the high thermal stability of the sulfonic acid sites incorporated onto the SBA-15 mesostructured silicas. Sulfonic acid-functionalized mesostructured silicas have demonstrated excellent catalytic behaviour in the acetalisation of glycerol with acetone to yield 2,2-dimethyl-1,3-dioxolane-4-methanol Supported and Free‐Standing Sulfonic Acid Functionalized Mesostructured Silica Films with High Proton Conductivity DOI: 10.1016/J.APCATA.2008.04.041 Corpus ID: 53598576. Acid-catalyzed etherification of bio-glycerol and isobutylene over sulfonic mesostructured silicas @article{Melero2008AcidcatalyzedEO, title={Acid-catalyzed etherification of bio-glycerol and isobutylene over sulfonic mesostructured silicas}, author={J. Melero and G. Vicente and Gabriel Morales and M. Paniagua and J. M. Moreno and R. Rold By subsequent chemical derivatization of the grafted species, thiol and sulfonic acid modified silicas are obtained.

Catalysis Letters 2005, 102 (3-4) , 163-169. DOI: 10.1007/s10562-005-5850-x. Rafael van Grieken, Juan A. Melero, Gabriel Morales. Fries rearrangement of phenyl acetate over sulfonic modified mesostructured SBA-15 materials. Request PDF | Comparison of acid sulfonic mesostructured silicas for 1butylacetate synthesis | Ordered mesoporous silicas MCM-41, HMS, SBA-15 (hexagonal), and MCM-48 (cubic) have been synthesized Sulfonic acid-functionalized mesostructured silicas have demonstrated excellent catalytic behaviour in the acetalisation of glycerol with acetone to yield 2,2-dimethyl-1,3-dioxolane-4-methanol, also known as solketal. This molecule constitutes an excellent compound for the formulation of gasoline, diesel and biodiesel fuels. 2013-09-10 · Sulfonic mesoporous silicas have demonstrated an outstanding catalytic performance in the esterification of levulinic acid with different alcohols to produce alkyl levulinates, a family of chemicals considered to be excellent oxygenated fuel extenders for gasoline, diesel and biodiesel.
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2015 — Figur 2. Fastställande av mesostructured kristallgitter och ytparametrar av vagnhjulformade porer. N-cyclohexyl-3-aminopropane sulfonic acid (CAPS), Dojindo El-Safty, S. A. Functionalized hexagonal mesoporous silica av C De la Torre Paredes · 2018 — mesoporous silica nanoparticles using peptides as molecular gates in which the release of the tetraacetic acid, chloride, urea or sulfonic acid groups, the materials proved to be [45] Calcination of the mesostructured phase resulted in the. additiveson the morphology of mesostructured silica templated by pluronics. opening reaction using oleic acid (OA) with p-toluene sulfonic acid (PTSA) as a Substitution of Nafion with sulfonated polysulfone in membrane–electrode Silica fluxes and trapping in two contrasting natural impoundments of the upper of cohesive fatigue effects in grain boundaries of a piezoelectric mesostructure (APS) allowing for covalent binding to the calcined mesostructured silica.

They also overviewed new types Abstract Ordered mesoporous silicas MCM-41, HMS, SBA-15 (hexagonal), and MCM-48 (cubic) have been synthesized and functionalized with propylsulfonic acid groups by post-oxidation method. Functionalization was carried out by grafting and co-condensation techniques in a sol–gel process. This process required TEOS, MPTS and an appropriate surfactant as structure-directing agent. Synthesis Sulfonic acid-functionalized mesostructured SBA-15 silicas have been demonstrated to be active for the catalytic transesterification of glycerol with methyl acetate to produce di- and triacetylglycerols. An optimization of the reaction conditions carried out with pharmaceutical glycerol by means of experimental design methodology showed that it is necessary to use a high methyl acetate to 2008-08-31 · Sulfonic acid-functionalized mesostructured silicas have demonstrated an excellent catalytic behavior in the etherification of glycerol with isobutylene to yield tert-butylated compounds.
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Efficient conversion of levulinic acid into alkyl levulinates catalyzed by sulfonic mesostructured silicas . 24 Sulfonic-acid-functionalized mesostructured silicas have demonstrated an excellent catalytic behavior in the etherification of glycerol with isobutylene to yield tert-butylated derivates. Di-tert-butylglycerols (DTBG) and tri-tert-butylglycerol (TTBG) have shown to be valuable fuel additives leading to decreases in the emission of particulate matter, hydrocarbons, carbon monoxide and Abstract Sulfonic mesoporous silicas have demonstrated an outstanding catalytic performance in the esterification of levulinic acid with different alcohols to produce alkyl levulinates, a family of chemicals considered to be excellent oxygenated fuel extenders for gasoline, diesel and biodiesel. Catalyst screening indicated that propylsulfonic acid-modified SBA-15 material was the most active Supported and Free‐Standing Sulfonic Acid Functionalized Mesostructured Silica Films with High Proton Conductivity Ralf Supplit Department of Chemical System Engineering, The University of Tokyo, 7‐3‐1 Hongo, Bunkyo‐ku, 113‐8656 Tokyo, Japan Mesoporous silicas have found widespread application within the field of heterogeneous catalysis. Acid functionalization of such materials, through one-pot or post-synthetic grafting of sulfonic Sulfonic acid-functionalized mesostructured silicas have demonstrated excellent catalytic behaviour in the acetalisation of glycerol with acetone to yield 2,2-dimethyl-1,3-dioxolane-4-methanol, also known as solketal. This molecule constitutes an excellent compound for the formulation of gasoline, diesel and biodiesel fuels.

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Producción de biocombustibles. Show simple item record. Efficient conversion of levulinic acid into alkyl levulinates catalyzed by sulfonic mesostructured silicas Likewise, the use of mesostructured supports has been shown as a factor improving the catalytic performance as compared with macroporous sulfonic acid-based resins, likely due to an enhancement of the mass transfer rates of large molecules, such as triglycerides, within the catalyst structure. ion-exchange resins, sulfonic acid mesostructured silicas, sulfonated carbons, heteropolyacids, sulfated zirconia and acidic ionic liquids have been studied for The formation of lamellar mesostructured silica by a neutral route in dodecylbenzene sulfonic acid (DBSA)/aminoalkoxysilane/water systems was investigated by Sulfonic acid-functionalized mesostructured silicas have demonstrated excellent SBA-15 mesoporous silica has been functionalized with arenesulfonic acid SBA-15 mesostructured silica functionalized with sulfonic acids was evaluated as sorbent. The proposed method was fully validated in sorghum flour showing Melero described the synthesis of mesostructured silica frameworks featuring pending organosulfonic arms. The best catalyst provided quantitative conversion Efficient production of 5-ethoxymethylfurfural from fructose by sulfonic mesostructured silica using DMSO as co-solvent. Morales G, Paniagua M, Melero JA, 1.1.2 Periodic mesoporous silicas: synthesis and mechanisms .