Application of sulfonic acid functionalized MCM-41 materials—Selectivity changes in various probe reactions

Rác, Bulcsú; Nagy, Mariann; Pálinkó, István; Molnár, Árpàd

doi:10.1016/j.apcata.2006.08.039

Cited by 38 publications

(7 citation statements)

References 26 publications

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“…In particular, when the same procedure was applied to the vermiculite, it created a material with an acidity higher than that of the materials that underwent the functionalizing process only, such as MCMs, SBA-15 and the functionalized bentonite. 9,22 All of these results suggest that the proposed method for functionalization of these materials created a higher acidity than the previous procedures; therefore, these materials could be used as catalysts in organic reactions that involve Brønsted acidity.…”

mentioning

confidence: 77%

Functionalization of Bentonite and Vermiculite after the Creation of Structural Defects through an Acid Leaching Process

Moraes

Miranda

Angélica

et al. 2017

J. Braz. Chem. Soc.

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The synthesis and use of functionalized materials is growing every year. Thus, this work presents a methodology for the functionalization of bentonite and vermiculite after the acid leaching of the raw materials. Leaching was performed with sulfuric acid (H 2 SO 4 ), and the functionalization was performed with (3-mercaptopropyl)trimethoxysilane (MPTS), which was oxidized after being anchored to the support. Compared to the results in the literature for directly functionalized raw bentonite, the materials had a greater number of anchored propyl sulfonic acid groups, and the greatest number of these groups led to an increase in the acidity of the raw materials. The raw and functionalized bentonite and vermiculite were characterized by X-ray diffraction (XRD), energy dispersive X-ray (EDX), thermogravimetric analysis (TGA), N 2 adsorption and the surface acidity was determined by acid-base titration.

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mentioning

confidence: 77%

Functionalization of Bentonite and Vermiculite after the Creation of Structural Defects through an Acid Leaching Process

Moraes

Miranda

Angélica

et al. 2017

J. Braz. Chem. Soc.

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“…This peak appears shifted toward a diffraction angle slightly higher than the one corresponding to the MCM‐41 material (about 2.2°), which can be explained by a modest diminution in the pore size as a consequence of the incorporation of cyano moieties into the MCM‐41 pores. Additionally, the absence of the d 110 and d 200 reflections indicates that the material has a somewhat distorted hexagonal structure [51].…”

Section: Resultsmentioning

confidence: 99%

Determination of personal care products in water using UHPLC–MS after solid phase extraction with mesoporous silica‐based MCM‐41 functionalized with cyanopropyl groups

Kharbouche

García

Lozano

et al. 2020

J of Separation Science

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A silica-based MCM-41 mesoporous material functionalized with cyanopropyl groups has been synthesized by cocondensation, characterized and applied to preconcentrate six parabens and three UV filters in river and swimming-pool waters. The analytes were quantified by ultra-high performance liquid chromatography-tandem mass spectrometry, according to the Directive 96/23/EC. Even though matrix effect was negligible, quantification in river water samples with the standard addition approach improved the recoveries obtained using solvent-based and even with matrixmatched calibration. The method quantification limits in river water samples were 0.05 ng/mL for 2,4-dihydroxybenzophenone and 0.01 ng/mL for the rest. Recoveries, evaluated for a concentration level of 0.5 ng/L, were in the range 93.5-107.6% for parabens and in the range 64.2-85.8% for UV filters, with relative standard deviations intraday ≤10.2 and 10.8%, respectively. This parameter, evaluated for a concentration level of 0.1 ng/L, ranged between 98.3 and 110.4% for parabens and between 61.9 and 89.9% for UV filters, with relative standard deviation intraday ≤15.3 and 15.5%, respectively. The two UV filters with lower recoveries were the most affected by the addition of sodium chloride. River and swimming pool waters were analyzed and all the personal care products were found in the swimming pool water, whereas only methylparaben was detected in the river water. K E Y W O R D Sfunctionalized MCM-

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“…In order to determine the amount of acidity present in the samples, acid base titration was used as prescribed in [61]. We have evaluated the acid capacity of materials which ultimately entails the catalytic active sites in materials.…”

Section: Acidity Measurementmentioning

confidence: 99%

Liquid-phase Alkylation of Toluene by Benzyl Alcohol over Micro-mesoporous Hierarchical Mordenite Zeolite

Bandopadhyay

Koshti

2023

Preprint

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In this work, post-synthetic effective acid (HNO3) and base (NaOH) etching technique are used to create hierarchical mordenite having different pore structure. The powder X-ray diffraction (P-XRD) technique was used to confirm the crystalline structure of the base modified and acid modified mordenite. Field emission-Scanning electron microscope (FE-SEM) was employed to confirm the structural morphology of the materials. The modified mordenite were further characterized by Inductive coupled plasma-optical emission spectrometry (ICP-OES), N2 adsorption-desorption isotherms, thermogravimetric analysis (TGA), acid base titration, to confirm the structural integrity, presence of active acidic sites, and other vital parameters. The structure was well conserved after the change, as evidenced by the characterization. The toluene alkylation with benzyl alcohol using hierarchical Mordenite and H-Mordenite produced mono-benzylated toluene. Comparison between acid treated, base treated and H-Mordenite was done. All samples were catalytically active as proved by the catalytic result in the alkylation reaction. The results show that the base alteration dramatically enhances the mesoporous surface area of H-Mordenite. Furthermore, the acid treated Mordenite had the highest benzyl alcohol conversion (75%), but the base modified Mordenite had benzyl alcohol conversion of 73% with the highest mono-benzylated toluene selectivity (61%). The process was further optimised by varying the reaction temperature, duration, and catalyst quantity. Gas Chromatography (GC) was used to evaluate the reaction products and gas chromatography-mass spectrometry (GC-MS) was used to confirm them. Introduction of mesoporosity in the microporous Mordenite was found to have significant effect on their catalytic activity.

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Application of sulfonic acid functionalized MCM-41 materials—Selectivity changes in various probe reactions

Cited by 38 publications

References 26 publications

Functionalization of Bentonite and Vermiculite after the Creation of Structural Defects through an Acid Leaching Process

Functionalization of Bentonite and Vermiculite after the Creation of Structural Defects through an Acid Leaching Process

Determination of personal care products in water using UHPLC–MS after solid phase extraction with mesoporous silica‐based MCM‐41 functionalized with cyanopropyl groups

Liquid-phase Alkylation of Toluene by Benzyl Alcohol over Micro-mesoporous Hierarchical Mordenite Zeolite

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