In situ FTIR study of the formation of MCM-41

Holmes, Stuart M.; Zholobenko, Vladimir L.; Thursfield, Alan; Plaisted, R.J.; Cundy, Colin S.; Dwyer, John

doi:10.1039/a801898g

Cited by 93 publications

(54 citation statements)

References 4 publications

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“…The lifetime and intensity values of the long-lived components (775) [26]. The presence of the mesoporous template in the samples before synthesis is shown in the FTIR spectra at the bands of ≈ 2920, 2850, 1483, and 730 cm −1 [27] (Fig. 1).…”

Section: Resultsmentioning

confidence: 99%

Positron Annihilation Lifetime Spectroscopy Study of the Formation of Mesoporous Materials from the Zeolite Precursor

Bosnar

Gržeta

2014

Acta Phys. Pol. A

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In this work, positron annihilation lifetime spectroscopy was used for the structural characterisation of porous materials prepared from amorphous zeolite precursors acting as the starting materials and hexadecyltrimethylammonium bromide acting as a mesoporous template. The best ts of the obtained lifetime spectra provide a four-component exponential decomposition. The lifetime values of the long-lived components point to the presence of mesoporous voids. Infrared and X-ray analyses show that the obtained materials consist partly of a crystalline zeolite structure.

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Section: Resultsmentioning

confidence: 99%

Positron Annihilation Lifetime Spectroscopy Study of the Formation of Mesoporous Materials from the Zeolite Precursor

Bosnar

Gržeta

2014

Acta Phys. Pol. A

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“…The CTAB/MCM-41, CTMATM and CTMATM/MCM-41 all have two characteristic peaks at 2,926 and 2,850 cm -1 , assigned to the asymmetric and symmetric CH 2 stretching modes, and peaks in the 1,450-1,500 cm -1 region have been assigned to CH 2 scissoring and CH 3 -(N ? ) asymmetric bending modes [28]. consisting of well-ordered channels is preserved after the incorporation of MoS 2 .…”

Section: ''Ship-in-a-bottle'' Synthesismentioning

confidence: 94%

‘Ship-in-a-Bottle’ Synthesis of MoS2/MCM-41 Catalysts by Decomposition of Single Source Precursor in Mesoporous Channel

et al. 2012

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MoS 2 /MCM-41 catalysts have been prepared by thermal decomposition of MCM-41 with cetyltrimethylammonium thiomolybdate, which was synthesized by reaction between ammonium thiomolybdate and cetyltrimethylammonium bromide left in the pore channel of MCM-41. The obtained catalysts exhibit type IV adsorption-desorption isotherms, indicating that MCM-41 mesoporous structure is retained during the synthesis process. With increasing loading of MoS 2 , the catalytic activity of MoS 2 /MCM-41 for HDS of DBT first increases, followed by a leveling off above 10 % MoS 2 loading, likely due to lack of accessibility to additional active sites. For the first time over MoS 2 catalysts, the DDS (i.e., hydrogenolysis) reaction pathway is favored with 100 % selectivity. This unique performance is associated with single layer MoS 2 sites stabilized within the pores of the MCM-41 support.

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“…Isso pode estar relacionado a uma estruturação de poros com paredes mais delgadas para BS-MCM-41(2). 36 Entretanto, o volume e o tamanho de poros aumentaram em ~18,2 % e ~15,3 %, respectivamente, podendo ter ocorrido, em certas regiões, o colapso parcial das paredes de dois poros ou mais, resultando em poros de maior tamanho. 37 De acordo com a Figura 6, a distribuição dos poros da BS-MCM-41(2) é maior que em BS-MCM-41(1), apresentando poros em toda a região de 2-4,5 nm.…”

Section: Microscopia Eletrônica De Varredura Das Amostras De: (A) Eunclassified

“…De acordo com Holmes et al, 36 o aumento da temperatura de síntese permite uma maior polimerização dos tetraedros de silício, propiciando uma maior formação de unidades Q 4 . Isto promove a formação de poros bem ordenados contendo parede espessa, corroborando para uma melhor uniformidade dos poros (Figura 6).…”

Section: Microscopia Eletrônica De Varredura Das Amostras De: (A) Eunclassified

Síntese do material mesoporoso MCM-41 usando esponja de água-doce como fonte de sílica

Júnior¹,

Cavalcanti²,

Matos³

et al. 2013

Quím. Nova

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Recebido em 14/3/13; aceito em 11/7/13; publicado na web em 9/8/13 SYNTHESIS OF MCM-41 MESOPOROUS MATERIAL USING FRESHWATER SPONGE AS A SOURCE OF SILICA. Fresh water sponge was used as a silica source for the synthesis of MCM-41 via the hydrothermal process. The silica was extracted from the sponge by washing with nitric acid and piranha solution. Synthesis of MCM-41 was performed at 100 °C for 5 days and the procedure was optimized, with modifications made to the leaching temperature of the silica and the synthesis of mesoporous material, which was characterized by XRD, FT-IR, SEM and adsorption of N 2. The optimal result was achieved at a temperature of 135 °C for 3 days, showing ordered mesoporous material with a surface area of 1080 m 2 g -1.

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In situ FTIR study of the formation of MCM-41

Cited by 93 publications

References 4 publications

Positron Annihilation Lifetime Spectroscopy Study of the Formation of Mesoporous Materials from the Zeolite Precursor

Positron Annihilation Lifetime Spectroscopy Study of the Formation of Mesoporous Materials from the Zeolite Precursor

‘Ship-in-a-Bottle’ Synthesis of MoS2/MCM-41 Catalysts by Decomposition of Single Source Precursor in Mesoporous Channel

Síntese do material mesoporoso MCM-41 usando esponja de água-doce como fonte de sílica

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