2010-05-15 · This work presents the preparations of mesostructured silicas with propylsulfonic groups introduced into the materials by grafting and co-condensation route. This study assessed the influence of morphology and the materials over catalytic performance on an esterification reaction to produce 1-butylacetate using hexagonal (MCM-41, SBA-15, and HMS) and cubic (MCM-48) mesophases.
Controlling adsorption of albumin with hyaluronan on silica surfaces and sulfonated latex particles. Swelling of a mesostructured zirconium oxide film. Physica.
group of the anionic surfactant in the order (i) sulfonate, sulfate and phosphate, and (ii) of alkyltrimethylammonium surfactants in aqueous poly (styrenesulfonate) Ibuprofen loading into mesostructured silica using liquid carbon dioxide as a Ibuprofen Loading into Mesostructured Silica using Liquid Carbon Dioxide as a ]ammonio)-trifluoromethane-sulfonate-End-Capped Poly(tetrahydrofuran). 5 nov. 2020 — doped with mesostructured functionalized silica particles, polyethersulfone (PES)/sulfonated polysulfone (SPSf)/GO mixed matrix membranes Controlling adsorption of albumin with hyaluronan on silica surfaces and sulfonated latex particles. Swelling of a mesostructured zirconium oxide film. Physica. 6 dec.
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. by thiol-modified MCM, or oxidation of the thiol to sulfonic acid groups [82].
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
Recently, the modified MCF silicas were reported to be efficient catalysts for the Sulfonic-acid functionalized mesostructured silicas have demonstrated an excellent catalytic behavior in the etherification of glycerol with isobutylene to yield tert-butylated derivates. Mesoporous silica materials (HS-JLU-20) with an extremely high content of mercaptopropyl groups have been successfully synthesized using fluorocarbon−hydrocarbon surfactant mixtures through a simple co-condensation approach of tetraethyl orthosilicate (TEOS) and (3-mercaptopropyl)trimethoxysilane (MPTS), which are characterized by X-ray diffraction (XRD), nitrogen adsorption and desorption 10% of total silicon atoms were functionalized with propyl-sulfonic acid groups. Arene-sulfonic-acid functionalized mesostructured silica and organosilica were synthesized simily to that described for the lar -sulfonic-acid functionalized propyl mesoporous solids above [13]. 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.
10% of total silicon atoms were functionalized with propyl-sulfonic acid groups. Arene-sulfonic-acid functionalized mesostructured silica and organosilica were synthesized simily to that described for the lar -sulfonic-acid functionalized propyl mesoporous solids above [13]. In this case, following the prehydrolysis step of the
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. Abstract Silica‐supported sulfonic acids are a class of solid Brønsted acid catalysts that generally comprise organo‐sulfonic acid groups tethered to silica surfaces. Propyl-sulfonic-acid functionalized mesostructured silica and organosilica were synthesized following a one-pot co-condensation procedure previously employed for the prepara-tion of propyl-sulfonic-acid functionalized silica SBA-15 [11].
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Read "Supported and Free‐Standing Sulfonic Acid Functionalized Mesostructured Silica Films with High Proton Conductivity, European Journal of Inorganic Chemistry" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Acid-catalyzed etherification of bio-glycerol and isobutylene over sulfonic mesostructured silicas Author MELERO, J. A 1;
Melero JA, Morales G, Iglesias J, Paniagua M, Hernández B, Penedo S (2013) Efficient conversion of levulinic acid into alkyl levulinates catalyzed by sulfonic mesostructured silicas. Appl Catal A 466:116–122. CAS Article Google Scholar
Línea Investigación: Línea 8. 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.
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This molecule constitutes an excellent compound for the formulation of gasoline, diesel and biodiesel fuels. The activity achieved with arenesulfonic acid-functionalized silica of this work was to evaluate sulfonic acid-functionalized SBA-15 mesostructured silicas as strong cation-exchange (SCX) SPE sorbents for the analysis of TAs in GF matrices by HPLC-MS/MS. As atropine and scopolamine are the most prevalent TAs in this kind of samples, they were chosen as target analytes. Sulfonated mesostructured silica-carbon nanocomposites with varying carbon content, acidic site density and porosity, obtained via the one-pot evaporation induced self-assembly (EISA) synthesis The unique properties of mesostructured cellular foam (MCF) silica such as, large pore size, continuous three-dimensional (3D) pore system and hydrothermal robust materialallow favorable conditions for incorporating active sites to produce modified MCF silica as catalysts, biocatalysts and adsorbents.
Di- tert -butylglycerols (DTBG) and tri- tert -butylglycerol (TTBG) have shown to be valuable fuel additives leading to decreases in the emission of
Catalyst performance of the acid-functionalized mesoporous catalyst materials typi- cally show weight loss profiles that can be divided into three Propyl- and arene-sulfonic acid modified mesostructured regions: (1) from room temperature to 150 C attributed to SBA-15 silicas have previously been demonstrated as active water desorption, (2
Textural properties of sulfonic acid-modified mesostructured silicas have been evaluated by means of nitrogen adsorption and desorption isotherm at 77 K using a Micromeritics TRISTAR 3000 system. ata were analyzed using the BJH model and D pore volume was taken at P/Po= 0.975 single point. Structural characterization was
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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Sulfonic-acid functionalized mesostructured silicas have demonstrated an excellent catalytic behavior in the etherification of glycerol with isobutylene to yield tert-butylated derivates.
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 .
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6 days ago Sulfonic acid-functionalized mesostructured silicas have been evaluated in the solvent-free aldol dimerization of biomass-derived levulinic acid
The products of glycerol Nov 20, 2018 Abstract Sulfonic acid based mesostructures (SAMs) have been developed in For the sulfonation of mesoporous silica materials, grafting is the most The protons from the −SO3H groups in these mesostructured material Mesoporous silicas are inorganic materials with large surface areas, uniform solid acid catalysts: sulfonic acid group‐functionalized mesostructured polymers. Later, sulfonic acid-functionalized mesostructured SBA-. 15 silicas were utilized for the catalytic transesterification of glycerol with methyl acetate to produce zeolites, sulfonic ion-exchange resins, sulfonic modified mesostructured silica as Lewis acid properties, well-defined mesostructure and enhanced surface Lithium Sulfonate Functionalization of Carbon Cathodes as a Substitute for Lithium On the Formation Mechanism of Pluronic-Templated Mesostructured Silica.
selected to provide 10 % of total silicon moles. These two sulfonic acidmodified - mesostructured silicas provide different acid strengths, as introduced by the different molecular environments of the sulfonic acid sites (Pr-SBA-15 < Ar-SBA-15). Commercial acid catalysts: Nafion®-SiO 2 composite (SAC-13) with resin content
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. Samples were heated in a Mettler TGA/sDTA- Propyl-sulfonic-acid functionalized mesostructured silica 851e ThermoGravimetric Analyzer from 25 to 800 C at a rate and organosilica were synthesized following a one-pot co- of 10 C/min under constant nitrogen gas flow of 50 ml/min. condensation procedure previously employed for the prepara- The concentrations of surface sulfonic acid groups were deter- tion of propyl-sulfonic-acid functionalized silica SBA-15 [11]. Efficient conversion of levulinic acid into alkyl levulinates catalyzed by sulfonic mesostructured silicas .
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.