Comparative study of ethylene- and ethenylene-bridged periodic mesoporous organosilicas

Goethals, Frederik; Vercaemst, Carl; Cloet, Veerle; Hoste, Serge; Voort, Pascal Van Der; Driessche, Isabel Van

doi:10.1016/j.micromeso.2009.12.004

Cited by 16 publications

(18 citation statements)

References 29 publications

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“…The materials retain porosity and ordering after three consecutive reactions as can be seen from the nitrogen sorption and XRD data. These results also confirm the reported stability of Periodic Mesoporous Organosilicas [20,23]. Table 2 presents an overview of the chemical characterization of the solids after the different synthetic procedures.…”

Section: Characterization Of the Solidssupporting

confidence: 84%

Catalytic Upgrading of Bio-Oil by Reacting with Olefi ns and Alcohols over Solid Acids: Reaction Paths via Model Compound Studies

Serrano‐Ruiz¹

2015

Advanced Biofuels

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A Periodic Mesoporous Organosilica (PMO) functionalized with sulfonic acid groups has been successfully synthesized via a sequence of post-synthetic modification steps of a trans-ethenylene bridged PMO material. The double bond is functionalized via a bromination and subsequent substitution obtaining a thiol functionality. This is followed by an oxidation towards a sulfonic acid group. After full characterization, the solid acid catalyst is used in the acetylation of glycerol. The catalytic reactivity and reusability of the sulfonic acid modified PMO material is investigated. The catalyst showed a catalytic activity and kinetics that are comparable with the commercially available resin, Amberlyst-15, and furthermore our catalyst can be recycled for several subsequent catalytic runs and retains its catalytic activity.

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Section: Characterization Of the Solidssupporting

confidence: 84%

Catalytic Upgrading of Bio-Oil by Reacting with Olefi ns and Alcohols over Solid Acids: Reaction Paths via Model Compound Studies

Serrano‐Ruiz¹

2015

Advanced Biofuels

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“…Thus, here we define the hydrothermal stability of hybrid organosilica materials as the absence of monomeric dissolution accompanied by preserved overall performance. Nevertheless, chemical and structural changes can and do still occur [47][48][49].…”

Section: Thermal and Hydrothermal Stabilitymentioning

confidence: 99%

“…Monomers that are most likely to form hydrophobic surfaces are the ones with terminating organic groups [37,40,[52][53][54][55][56][57][58][59][60][61] or with long and flexible organic bridges [53,62]. Short or rigid bridges such as ethylene and p-phenylene do not have the length and spatial freedom to ''step out'' to the surface and completely shield the underlying siloxane bonds; thus, these materials keep on having a significant affinity for water [47,48,[62][63][64]. Furthermore, when these materials are used for waterpermeable microporous membranes, their networks explicitly require a significant degree of hydrophilicity.…”

Section: Thermal and Hydrothermal Stabilitymentioning

confidence: 99%

Structure–property tuning in hydrothermally stable sol–gel-processed hybrid organosilica molecular sieving membranes

Elshof

Dral

2015

J Sol-Gel Sci Technol

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Supported microporous organosilica membranes made from bridged silsesquioxane precursors by an acid-catalyzed sol-gel process have demonstrated a remarkable hydrothermal stability in pervaporation and gas separation processes, making them the first generation of ceramic molecular sieving membranes with sufficient performance under industrially relevant conditions. The commercial availability of various a,x-bis(trialkoxysilyl)alkane and 1,4-bis(trialkoxysilyl)benzene precursors facilitates the tailoring of membrane properties like pore size and surface chemistry via the choice of precursor(s) and process variables. Here, we describe the engineering of sols for making supported microporous thin films, discuss the thermal and hydrothermal stability of microporous organosilicas and give a short overview of the developments and applications of these membranes in liquid and gas separation processes since their first report in 2008.Graphical Abstract

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“…Hybrid organic-inorganic periodic mesoporous organosilica (PMO) materials have gained significant attention for application in catalysis [43]. Its synthesis involves the hydrolysis and template-assisted condensation of bis-(trialkoxy)silane-functionalized compounds, by which highly ordered materials can be obtained [44,45].…”

Section: Introductionmentioning

confidence: 99%

Dehydration of fructose to HMF in presence of (H3O)xSbxTe(2-x)O6 (x = 1, 1.1, 1.25) in H2O-MIBK

Mayer

Falcón

Dipaola³

et al. 2020

Molecular Catalysis

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The pyrochlores (H 3 O) x Sb x Te (2-x) O 6 (x = 1, 1.1 and 1.25) obtained by ion exchange from K x Sb x Te (2-x) O 6 oxides were used as catalysts for the conversion of fructose to 5-hydroxymethylfurfural (HMF) in H 2 O/Methyl isobutyl ketone (MIBK). The structure of the resulting compounds as well as the location of the H 3 O + units inside the three-dimensional network, were determined by XRD from powder samples. The effect of factors such as reaction time and temperature on the formation of HMF was studied. A fructose conversion of 99% and a yield of 59% were achieved after 120 min of reaction time and at 150°C temperature. The percentage of substitution of the cations Sb and Te in the position B of the pyrochlore was determinant to achieve the maximum incorporation of H 3 O + ions in the pyrochlore structure, which allowed to correlate the density of acidic sites present in the materials and their catalytic activity.

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Comparative study of ethylene- and ethenylene-bridged periodic mesoporous organosilicas

Cited by 16 publications

References 29 publications

Catalytic Upgrading of Bio-Oil by Reacting with Olefi ns and Alcohols over Solid Acids: Reaction Paths via Model Compound Studies

Catalytic Upgrading of Bio-Oil by Reacting with Olefi ns and Alcohols over Solid Acids: Reaction Paths via Model Compound Studies

Structure–property tuning in hydrothermally stable sol–gel-processed hybrid organosilica molecular sieving membranes

Dehydration of fructose to HMF in presence of (H3O)xSbxTe(2-x)O6 (x = 1, 1.1, 1.25) in H2O-MIBK

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