Sveriges lantbruksuniversitet - Primo - SLU-biblioteket
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 . 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.
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Synthesis and characterization of functionalized mesostructured silicas with acid sulphonic groups Universidad Rey Juan Carlos. Biblioteca. DSpace 6.2 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.
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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 . 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.
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The oxidation process is the same as described above. 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. Sulfonic-acid-functionalized mesostructured silicas have demonstrated an excellent catalytic behavior in the etherification of glycerol with isobutylene to yield tert-butylated derivates.
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
ion-exchange resins, sulfonic acid mesostructured silicas, sulfonated carbons, heteropolyacids, sulfated zirconia and acidic ionic liquids have been studied for biodiesel synthesis ,. The performance of such materials is dictated by the strength and accessibility of active acid sites to bulky FFA and
Hydrolysis of sugars catalyzed by water-tolerant sulfonated mesoporous silicas. Catalysis Letters 2005, 102 (3-4) , 163-169.
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For the case of the organosilica, 1,2-bis-(triethoxysilyl)ethane (BTSE, Aldrich) was additionally incorporated. View 0 peer reviews of Efficient conversion of levulinic acid into alkyl levulinates catalyzed by sulfonic mesostructured silicas on Publons Download Web of Science™ My Research Assistant : Bring the power of the Web of Science to your mobile device, wherever inspiration strikes. (B) The pathway used for the preparation of mesostructured MSU-G silicas. ( C ) The XRD patterns for the pristine surfactant were recorded for a 88:12 (v/v) water:ethanol suspension of neutral C° 12-2-0 gemini surfactant at the same concentration (3.0 weight %) used for MSU-G synthesis ( 16 ) and a thin-film sample of the surfactant on glass.
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.
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Sveriges lantbruksuniversitet - Primo - SLU-biblioteket
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  Calcination of the mesostructured phase resulted in the. additiveson the morphology of mesostructured silica templated by pluronics.
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LUP publications 2008
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. 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.
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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. Their activity and selectivity towards valuable products for fuel bio-additives (DTBG and TTBG) have shown to be comparable or even superior to those of macroporous sulfonic acid resins. The application of this chemistry to prepare pure Brønsted sulfonic acid functionalized mesoporous silicas has stimulated significant research effort in this area, since these materials are interesting alternatives to commercially available sulfonated polymer resins, such as Amberlyst–15 and Nafion-H (sulfonated polystyrene and perfluorinated sulfonic acid resins respectively), which suffer A mesoporous SBA-15 silica catalyst functionalized with phenylsulfonic acid groups (SBA-15-Ph-SO 3 H) as a novel hydrophobic nanoreactor solid acid catalyst for a one-pot three-component synthesis of 2H-indazolo [2,1-b]phthalazine-triones and triazolo [1,2-a]indazole-triones.
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 .