Sulfonic-acid functionalized mesostructured silicas have demonstrated an excellent catalytic behavior in the etherification of glycerol with isobutylene to yiel

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.

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.

Sulfonic acid functionalized silica films with 2D‐hexagonal mesostructures of various channel sizes are prepared in a one‐step synthesis. A successful combination of in situ oxidation of a mercapto‐functionalized silane with an evaporation induced self‐assembly (EISA) process in the presence of amphiphilic block copolymers allows the formation of a highly structured material with a 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. 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].

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.

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.

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. selected to provide 10 % of total silicon moles.

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

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]. For the case of the organosilica, 1,2-bis-(triethoxysilyl)ethane (BTSE, Aldrich) was additionally incorporated.

Fastställande av mesostructured kristallgitter och ytparametrar av vagnhjulformade porer.
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The combination of activity and 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.

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.
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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]. For the case of the organosilica, 1,2-bis-(triethoxysilyl)ethane (BTSE, Aldrich) was additionally incorporated.

Morales G, Paniagua M, Melero JA, 1.1.2 Periodic mesoporous silicas: synthesis and mechanisms . Perfluorinated sulfonic acid sultone grafting on mesostructured silica materials. I. F. F F. F. Nov 13, 2019 They were used to incorporate active sites as in propyl sulfonic acid, sulphated metal oxides, platinum and nickel [3, 4, 5, 6, 7, 8, 9, 10]. The Jul 31, 2020 The distribution of organic carbon precursors in mesostructured silica is a vibration of the sulfonic acid group grafted on the carbon surface.

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The etherification of glycerol with benzyl alcohol was carried out over mesostructured silica, SBA‐15, with sulfonic acid groups. The products of glycerol

A successful combination of in situ oxidation of a mercapto‐functionalized silane with an evaporation induced self‐assembly (EISA) process in the presence of amphiphilic block copolymers allows the formation of a highly structured material with a 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. 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]. For the case of the organosilica, 1,2-bis-(triethoxysilyl)ethane (BTSE, Aldrich) was additionally incorporated. 10% of total silicon atoms were functionalized with propyl-sulfonic acid groups.