sulfonic acid-modified mesostructured silicas provide different acid strengths, as introduced by the different molecular environments of the sulfonic acid sites (Pr-SO 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. 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

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. 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.

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. 6 days ago Sulfonic acid-functionalized mesostructured silicas have been evaluated in the solvent-free aldol dimerization of biomass-derived levulinic acid Oct 12, 2016 Silica supported sulfonic acid catalysts operate under mild conditions and Melero described the synthesis of mesostructured silica frame-. Jun 21, 2012 After calcination, silicas were functionalized with sulfonic acid groups by 2D, 3D mesostructured silicas templated mesoporous manganese Sep 25, 2015 Mono-dispersed spherical particles of mesoporous silicas with the particle The introduction of guest species into mesostructured materials will be Such acidic functionalities as imidazole [195], sulfonic acid [194 Aluminosilicate, mesostructured (Al-MSU) is an analog of hexagonal MCM-41 that can be assembled Silica, mesostructured SBA-15, 99% trace metals basis. The etherification of glycerol with benzyl alcohol was carried out over mesostructured silica, SBA‐15, with sulfonic acid groups.

2020 Dec 12;9(12):E1854. doi: 10.3390/foods9121854.

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.

Sulfonic-acid functionalized mesostructured silicas have demonstrated an excellent catalytic behavior in the etherification of glycerol with isobutylene to yiel Sulfonic acid-modified mesostructured silicas have demonstrated an excellent catalytic performance in the etherification of glycerol with isobutylene. Their activity and selectivity towards valuable products for fuel bio-additives (di- tert -butylglycerols and tri- tert -butylglycerol) have shown to be comparable or even superior to those of macroporous commercial sulfonic acid resins. 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.

Supported and Free‐Standing Sulfonic Acid Functionalized Mesostructured Silica Films with High Proton Conductivity

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.

This molecule constitutes an excellent compound for the formulation of gasoline, diesel and biodiesel fuels. 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).
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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 .

sulfonic acid based silica mesopores (SASM) were primarily employed in biomass production [8-10,17,19].
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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.

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.

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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.

Physica.