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PDF Polyvinyl chloride-hyperbranched polyamidoamine

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. 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.

Sulfonic mesostructured silicas

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 .

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.

PDF Polyvinyl chloride-hyperbranched polyamidoamine

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.

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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. 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. 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.

Photochromic mesostructured silica pigments dispersed in latex films2005Ingår i: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501, Vol. The formation of anionic surfactant templated mesoporous silica (AMS) is agent (CSDA) toward the rational synthesis of the targeted mesostructure. 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.
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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. sulfonic acid based silica mesopores (SASM) were primarily employed in biomass production [8-10,17,19]. In 2006, Melero and coworkers [20] extensively reviewed and discussed the advances, developments, and catalytic applications of organosulfonic acid-based mesopores in 1998-2006. 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.

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. 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 .
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1.5 g of dry as-synthesized material was dissolved in a mixture of HCl (20 mL) and EtOH (205 mL), the resultant mixture was refluxed at 70 °C for 24 h. 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.
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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. , . 1.5 g of dry as-synthesized material was dissolved in a mixture of HCl (20 mL) and EtOH (205 mL), the resultant mixture was refluxed at 70 °C for 24 h. The oxidation process is the same as described above.