Verified syntheses of mesoporous materials

Meynen, Vera; Cool, Pegie; Vansant, Etienne F.

doi:10.1016/j.micromeso.2009.03.046

Cited by 625 publications

(442 citation statements)

References 364 publications

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“…3) Titanium Catalysts Prepared by the Templated Sol-Gel Method [11] 2.36 g of hexadecyltrimethyl-ammonium bromide (CTAMBr) were dissolved in 24 mL ethanol. On another hand a mixture of 12 mL Ti(O i Pr) 4 , 22.8 mL EtOH and 4.72 mL HCl solutions was prepared.…”

Section: ) Zirconium Catalysts Prepared By the Sol-gel Methodsmentioning

confidence: 99%

Preparation and Catalytic Properties of Various Oxides and Mesoporous Materials Containing Niobium and Sulfate Ions, in the Etherification Reaction of 2-Naphtol

Hussein¹,

Nahas²,

Jahjah³

et al. 2018

IJOC

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Several types of solid acid catalysts were prepared based on oxides like (ZrO 2 , TiO 2 , HfO 2 , MCM-41 and SBA-15), using two main preparation methods: the precipitation and the sol-gel methods. Each catalyst was subjected to two types of impregnations: sulfate ions using sulfuric acid as precursor and niobium using niobium oxalate as precursor. These prepared catalysts were tested in the etherification reaction of 2-naphtol, where the catalysts showed both acidic and redox properties. The acidic character was manifested through the formation of 2-butoxynaphtalene (with moderate yields) when oxide is sulfated, and the redox character (when impregnated with niobium) manifested through the formation of the interesting product 2-ethylnaphtofuran (with low yields) and other products that were a result of oxidative coupling of two 2-naphtol molecules (binol and acetal of binol). However despite the effort, several attempts to increase the yield of 2-ethylnaphtofuran did not work. All products prepared were obtained in pure form and characterized by 1 H and 13 C NMR, GC and MS.

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Section: ) Zirconium Catalysts Prepared By the Sol-gel Methodsmentioning

confidence: 99%

Preparation and Catalytic Properties of Various Oxides and Mesoporous Materials Containing Niobium and Sulfate Ions, in the Etherification Reaction of 2-Naphtol

Hussein¹,

Nahas²,

Jahjah³

et al. 2018

IJOC

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“…[10][11][12][13][14][15][16][17][18][19][20][21][22]. Therefore, thermal stability of the mesostructured titania materials is one of the important issues to be addressed.…”

Section: Hex-nctio 2 /Ctab/coms Nanoskeletonmentioning

confidence: 99%

“…[10][11][12][13][14][15][16][17][18][19][20][21][22] This is most likely due to the non-crystallization and -crystal growth of the Hex-ncTiO 2 /CTAB Nanoskeleton and Hex-ncTiO 2 /CTAB/COM Nanoskeleton during thermal treatment. Wide-angle XRD patterns of Hex-ncTiO 2 /CTAB Nanoskeleton and Hex-ncTiO 2 /CTAB/COM Nanoskeleton hardly changed in the temperature range of 150-450 °C (see Figure 12).…”

Section: Colsua-d-10-00611 Revised August 2010mentioning

confidence: 99%

“…[10][11][12][13][14][15][16][17][18][19][20][21][22] In addition, preparation of mesostructured crystalline titania typically requires alcohol-based solvents, [10][11][12][13][14][15][16][17][18][19][20][21][22] so the replacement of many conventional alcohols as solvents used in the sol-gel reaction to the environmental benign alternatives is also an important challenge toward achieving the goal of green chemical processing.…”

Section: Introductionmentioning

confidence: 99%

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Pore-size expansion of hexagonal-structured nanocrystalline titania/CTAB Nanoskeleton using cosolvent organic molecules

Sakai

Yano

Shibata

et al. 2010

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Pore-size expansion of hexagonal-structured assembly of nanocrystalline titania (anatase) combined with cetyltrimethyammonium bromide (CH 3 (CH 2 ) 15 N + (CH 3 ) 3 Br -, CTAB) (named as Hex-ncTiO 2 /CTAB Nanoskeleton) was achieved with the aid of cosolvent organic molecules (COMs).The pore-size expanded Hex-ncTiO 2 /CTAB Nanoskeleton was prepared through the sol-gel reaction of titanium oxysulfate sulfuric acid hydrate (TiOSO 4 ·xH 2 SO 4 ·xH 2 O, TiOSAH) in an aqueous solution initiated by CTAB swollen micelles pre-prepared with the addition of COMs into aqueous CTAB micellar solutions at 60 ˚C (the product was named as Hex-ncTiO 2 /CTAB/COM Nanoskeleton). Long-chain alcohol(1-hexadecanol, C16OH), normal alkane (n-decane, C10) and benzene derivatives (benzene, Bz; 1,3,5-trimethylbenzene, TMB; 1,3,5-triethylbenzene, TEB; 1,3,5-triisopropylbenzene, TiPB) were used as COMs to evaluate the effects of COM solubilization site in CTAB micelles and COM molecular size on the pore-size expansion of the Hex-ncTiO 2 /CTAB/COM Nanoskeleton. We found that 1,3,5-trimethylbenzene (TMB) and 1,3,5-triethylbenzene (TEB) act as effective COMs for pore-size expansion of the Hex-ncTiO 2 /CTAB/COM Nanoskeleton in aqueous media. Pore sizes (average diameters) of the Hex-ncTiO 2 /CTAB/TMB Nanoskeleton and Hex-ncTiO 2 /CTAB/TEB Nanoskeleton weres enlarged up to 4.2 nm and 4.3 nm, respectively, while pore size (average diameter) of the Hex-ncTiO 2 /CTAB Nanoskeleton prepared in the absence of any COMs was 2.9 nm.We also revealed that thermal stability of the Hex-ncTiO 2 /CTAB/TMB Nanoskeleton became higher than that of Hex-ncTiO 2 /CTAB Nanoskeleton. The hexagonally pore-structure of the Hex-ncTiO 2 /CTAB/TMB Nanoskeleton was retained up to 400 ˚C, while the hexagonally pore-structure of the Hex-ncTiO 2 /CTAB Nanoskeleton was kept up to 300 ˚C.

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“…1) Among the wide variety of silica mesophases, MCM-41 and SBA-15 have been the most extensively investigated. Though both exhibit two-dimensional hexagonal structures (p6 mm), they have some notable differences: (i) SBA-15 is endowed with larger pores and thicker pore walls than MCM-41; (ii) MCM-41 is purely mesoporous in nature, whereas a typical SBA-15 silica contains a significant amount of micropores within the pore walls; and (iii) while the channels of MCM-41 are not connected to each other, those of SBA-15 are interconnected via micropores or secondary mesopores.…”

Section: Introductionmentioning

confidence: 99%

Preparation and catalytic evaluation of cytochrome c immobilized on mesoporous silica materials

Kato

Suzuki

Tanemura

et al. 2010

J. Ceram. Soc. Japan

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Cytochrome c (cyt. c, molecular size of 2.5 nm © 2.5 nm © 3.7 nm) was immobilized on six types of mesoporous silicates (MPS), having pore sizes from 2.8 to 15.0 nm, and their catalytic activities were evaluated by oxidation of thioanisol with H 2 O 2 . Among the silica materials, cyt. c immobilized on MPS pore size of 3.4 nm) showed the best catalytic activity, and its relative activity was improved 1.7 times over that of cyt. c solution. Enhancement of catalytic activity was obtained by immobilization on MPS having a similar size (mesopore) to the molecular size of cyt. c. Activity stability of cyt. c was also evaluated under the various conditions that caused protein inactivation, like HCl, urea, methanol, and guanidine. As results, stability was improved by the immobilization on silica material having a larger pore size (15.0 nm), offered an environment for encapsulating entire cyt. c molecules, inhibiting cyt. c from unfolding and irreversible decomposition.

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Verified syntheses of mesoporous materials

Cited by 625 publications

References 364 publications

Preparation and Catalytic Properties of Various Oxides and Mesoporous Materials Containing Niobium and Sulfate Ions, in the Etherification Reaction of 2-Naphtol

Preparation and Catalytic Properties of Various Oxides and Mesoporous Materials Containing Niobium and Sulfate Ions, in the Etherification Reaction of 2-Naphtol

Pore-size expansion of hexagonal-structured nanocrystalline titania/CTAB Nanoskeleton using cosolvent organic molecules

Preparation and catalytic evaluation of cytochrome c immobilized on mesoporous silica materials

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