Sol–gel synthesis of MCM-41 silicas and selective vapor-phase modification of their surface

Roik, N. V.; Belyakova, L. A.

doi:10.1016/j.jssc.2013.09.027

Cited by 41 publications

(30 citation statements)

References 59 publications

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“…In the after calcined samples, the broad band around 3438 cm -1 and the small one at 1630 cm -1 are attributed to OH -groups from adsorbed water molecules 36,31,35,37 . The adsorption bands noticed at 1224 and 1076 cm -1 correspond to external and internal asymmetric stretching vibrations of Si-O-Si bonds, respectively, and the band at 798 cm Other bands around 462 and 961 cm -1 are attributed to tetrahedral bending of Si-O bonds and stretching vibrations of the Si-OH bonds, respectively 17,26,35 .…”

Section: Resultsmentioning

confidence: 99%

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Influence of Aluminum Addition in the Framework of MCM-41 Mesoporous Molecular Sieve Synthesized by Non-Hydrothermal Method in an Alkali-Free System

et al. 2017

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Purely siliceous MCM-41 and Al-containing MCM-41 (Al-MCM-41) mesoporous materials were synthesized by non-hydrothermal method in alkali-free ions medium at room temperature and short reaction times. Under these synthesis conditions, it was also investigated the influence of Al incorporation in the crystal structure of MCM-41. The solids were characterized by ICP-OES, AAS, N 2 adsorption at 77 K, XRD, TEM, NH 3 -TPD, 27 Al and 29 Si-MAS-NMR, FT-IR and TGA. The resulting mesoporous materials showed a well-defined hexagonally ordered pore geometry maintaining a uniform and unimodal pore size distribution with high specific surface areas (1000-1400 m 2 g -1 ). The Al +3 ions were introduced successfully in the structure of the purely siliceous MCM-41 expanding the unit cell parameter and forming four-coordinated Al species, and in a less extent, forming six-coordinated Al species. In addition, the surface acidity of the MCM-41 increased with Al loading. Contrary, the presence of Al in the MCM-41 mesoporous structure resulted in a decrease of the crystallinity and specific surface area possibly due to the presence of Al species in highly distorted tetrahedral structures and Al extra-framework or amorphous alumina occluded in the pores. The MCM-41 type mesoporous materials obtained in this work show similar characteristics of those synthesized by conventional hydrothermal methods.

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Section: Resultsmentioning

confidence: 99%

“…The reduced acidity of the pure siliceous MCM-41 may be attributed to the presence of Si-OH groups in its surface from adsorbed water molecules 26,[36][37][38] . However, when the Si/Al ratio was varied from MCM-41(50) to MCM-41(15), there was not a significant increase in the total acidity in this last sample.…”

Section: Resultsmentioning

confidence: 99%

Influence of Aluminum Addition in the Framework of MCM-41 Mesoporous Molecular Sieve Synthesized by Non-Hydrothermal Method in an Alkali-Free System

et al. 2017

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“…Mesoporous silicas MCM-41 and Cl-MCM-41 were prepared in water-ethanol-ammonia solution according to reported co-condensation procedure [37] with cetyltrimethylammonium bromide as a structure directing agent, with tetraethylorthosilicate and (3-chloropropyl)triethoxysilane as a silica source.…”

Section: Tetraethylorthosilicatementioning

confidence: 99%

“…Selective chemical modification of outer surface of template-containing MCM-41 silica particles with vapours of (3-chloropropyl)-triethoxysilane was carried out by use of special vacuum equipment [37]. Mesoporous silica was placed into a quarts evacuated reactor and degassed at 393 K for 2 h before silane coupling.…”

Section: Tetraethylorthosilicatementioning

confidence: 99%

Decoration of MCM‑41 Pore Entrances with Amino-Containing Groups for pH-Controlled Release of para-Aminobenzoic Acid

Roik¹,

Belyakova²,

Dziazko³

et al. 2015

Him. Fiz. Tehnol. Poverhni

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“…It was reported [3,4] that impregnation of Al metal to the MCM-41, i.e. Al-MCM-41, increased the amount of the acid sites and this lead to a potential material to be used as catalyst in a cracking reaction.…”

Section: Introductionmentioning

confidence: 99%

Production of Hydrocarbon (C7-C20) from Hydrocracking of Fatty Acid Methyl Esters on Pd/Al-MCM-41 Catalyst

Juwono

Triyono

Sutarno

et al. 2017

Bull. Chem. React. Eng. Catal.

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The production of hydrocarbon (C7-C20) and alcohol (C11-C19) from fatty acid methyl esters (FAMEs) compound are produced from the transesterification of the seed oil of the Nyamplung that has been conducted by the catalytic hydrocracking using Al-MCM-41 and Pd 2+ -impregnated-Al-MCM-41 catalysts. The performance of catalysts were compared by various analysis including the acidity that was determined by pyridine and FTIR, the crystal structure observed by XRD, the surface area and pore volume analyzed by BET/BJH, the surface morphology observed by TEM, the metal on the surface of catalyst observed by XPS and the product of the hydrocracking analyzed by GC-MS. Hexagonal structure of the MCM-41(100) was shown in the 2θ = 3 o -5 o of the diffractogram. The presence of impregnated Al and Pd observed at the 2θ = 20 o and 34 o , respectively. The Pd/Al-MCM-41 catalyst was more acidic than Al-MCM-41 catalyst. The surface area and pore volume of the catalyst decreased after the impregnation process. The tendency of catalytic hydrocracking of hydrocarbon produced was indicated that more amount of Palladium have more hydrocarbons aliphatic than alcohol.

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Sol–gel synthesis of MCM-41 silicas and selective vapor-phase modification of their surface

Cited by 41 publications

References 59 publications

Influence of Aluminum Addition in the Framework of MCM-41 Mesoporous Molecular Sieve Synthesized by Non-Hydrothermal Method in an Alkali-Free System

Influence of Aluminum Addition in the Framework of MCM-41 Mesoporous Molecular Sieve Synthesized by Non-Hydrothermal Method in an Alkali-Free System

Decoration of MCM‑41 Pore Entrances with Amino-Containing Groups for pH-Controlled Release of para-Aminobenzoic Acid

Production of Hydrocarbon (C7-C20) from Hydrocracking of Fatty Acid Methyl Esters on Pd/Al-MCM-41 Catalyst

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