Synthesis and characterization of spherical Tb-MCM-41

Pires, Luiza H. O.; Queiroz, Renan M.; Souza, Ruth P.; Costa, Carlos Emmerson Ferreira da; Zamian, José Roberto; Weber, Ingrid Távora; Filho, Geraldo Narciso da Rocha

doi:10.1016/j.jallcom.2009.10.134

Cited by 9 publications

(15 citation statements)

References 33 publications

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“…The N 2 physisorption isotherms and pore distribution (Figure 3a,b) of the AlSiM and (10, 20, 30) HPMo/AlSiM samples were classified as type IV according to the IUPAC classification, indicating the formation of structures mesoporous [40]. With a hysteresis cycle characteristic of uniform mesoporous material for AlSiM sample, the mesoporous materials obtained from metakaolin [44,46,50].…”

Section: Resultsmentioning

confidence: 99%

“…The 2θ scanning speed was 0.02° min −1 . The distance (a 0 ) between pore centers of the hexagonal structure was calculated by means of the equation a 0 = 2 d 100 /√3 [40].…”

Section: Methodsmentioning

confidence: 99%

“…Pore diameter (D p ) and pore volume (V p ) were obtained by the Barret-Joyner-Halenda (BJH) method. The pore wall thickness (W t ) was calculated according to Equation W t = a 0 − D p [40].…”

Section: Methodsmentioning

confidence: 99%

“…The nature of the support is an important factor for a successful reaction towards the best catalytic activity [37]. MCM-41 is the most studied member of the M41S family applied as catalytic support because of its regular structure, large surface area and uniform pore size, ranging from 15 to 100 Å [30,38,39,40,41]. The structure of the MCM-41 represents a hexagonal arrangement of cylindrical channels consisting of amorphous silica [41].…”

Section: Introductionmentioning

confidence: 99%

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Acetylation of Eugenol over 12-Molybdophosphoric Acid Anchored in Mesoporous Silicate Support Synthesized from Flint Kaolin

et al. 2019

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A new prepared catalyst, 12-molybdophosphoric acid (HPMo) anchored to the mesoporous aluminosilicate AlSiM, synthesized from Amazon kaolin, was characterized and used as a heterogeneous acid catalyst for the production of eugenyl acetate by acetylation of eugenol with acetic anhydride. The effect of various reaction parameters, such as catalyst concentration, eugenol/acetic anhydride molar ratio, temperature and reaction time, was studied to optimize the conditions of maximum conversion of eugenol. The kinetics studies showed that in eugenol acetylation, the substrate concentration follows a first order kinetics. The results of activation energy was 19.96 kJ mol−1 for HPMo anchored to AlSiM. The reuse of the catalyst was also studied and there was no loss of catalytic activity after four cycles of use (from 99.9% in the first cycle to 90% in the fifth cycle was confirmed), and an excellent stability of the material was observed. Based on catalytic and kinetic studies, HPMo anchored to AlSiM is considered an excellent catalyst.

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Section: Resultsmentioning

confidence: 99%

“…The 2θ scanning speed was 0.02° min −1 . The distance (a 0 ) between pore centers of the hexagonal structure was calculated by means of the equation a 0 = 2 d 100 /√3 [40].…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Acetylation of Eugenol over 12-Molybdophosphoric Acid Anchored in Mesoporous Silicate Support Synthesized from Flint Kaolin

et al. 2019

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“…The X-ray diffractograms of MCM-41, Se and Se-MCM-41 MCM-41 showed a typical mesoporous structure with three sharp peaks at low 2q values that can be indexed as (1, 0, 0), (1, 1, 0) and (2, 0, 0) reflections characteristics of mesoporous materials with hexagonal arrangement of their cylindrical channels ( Fig. 1(a)) 22,23 . As seen from Fig.…”

Section: Xrdmentioning

confidence: 99%

Synthesis and Characterization of Functionalized Se-MCM-41 a New Drug Carrier Mesopore Composite

Rahman¹,

Aznan²,

Yusof³

et al. 2017

Orient. J. Chem

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Various nanocomposite materials play a number of important roles in modern science and technology including pharmaceutical science. Among these materials, mesoporous materials cover a large number of applications in drug delivery system. The quantitative incorporation and high dispersion of selenium nanoparticles into MCM-41 have been made possible by the coordination between Se(IV) ion and aminopropyltriethoxysilane (APTES)-anchored MCM-41. The samples were characterized by X-ray powder diffraction, Fourier-transformed infrared spectroscopy (FTIR), scanning electron microscopy (SEM), nitrogen adsorption-desorption via multi-point Brunauer, Emmett and Teller (BET) analysis, Raman spectroscopy and UV-Vis diffusion reflection spectroscopy (UV-vis/DRS). The increase in cell parameter and the decrease in surface area observed by N 2 adsorption-desorption technique were taken as evidence of selenium introduction inside the MCM-41 framework. The behaviour of drug release in these nanocomposites is probably due to hydrogen bonding interactions between drug and the hydroxyl group on the composite framework.

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Facile preparation of ordered mesoporous Nb,Ta-MCM-41 by hydrothermal direct synthesis using columbite ore as metal source

Oliveira

Silva

Moriyama

et al. 2021

Ceramics International

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Synthesis and characterization of spherical Tb-MCM-41

Cited by 9 publications

References 33 publications

Acetylation of Eugenol over 12-Molybdophosphoric Acid Anchored in Mesoporous Silicate Support Synthesized from Flint Kaolin

Acetylation of Eugenol over 12-Molybdophosphoric Acid Anchored in Mesoporous Silicate Support Synthesized from Flint Kaolin

Synthesis and Characterization of Functionalized Se-MCM-41 a New Drug Carrier Mesopore Composite

Facile preparation of ordered mesoporous Nb,Ta-MCM-41 by hydrothermal direct synthesis using columbite ore as metal source

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