Preparation and characterization of (3-aminopropyl)triethoxysilane-modified mesoporous SBA-15 silica molecular sieves

Luan, Zhaohua; Fournier, Jay A; Wooten, Jan B.; Miser, Donald E.

doi:10.1016/j.micromeso.2005.04.006

Cited by 143 publications

(80 citation statements)

References 27 publications

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“…These materials have relatively large pore size (2-10 nm), which reduces mass transfer limitations and allows even large reactant molecules to enter the pores. Direct co-condensation and post-grafting procedures have been used to prepare organic-functionalized catalysts [4][5][6][7][8][9][10][11][12][13]. Direct co-condensation is essentially the co-polymerization of a silica precursor (typically a tetraethyl orthosilicate (TEOS)) and an organosilane precursor with supramolecular templates [4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

A comparative study of aminopropyl-functionalized SBA-15 prepared by grafting in different solvents

Shang

Guan

et al. 2011

Reac Kinet Mech Cat

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Two samples of aminopropyl-functionalized silica (APS) have been prepared by grafting an organosilane precursor 3-aminopropyl-triethoxysilane onto the SBA-15 in ethanol or toluene. Aminopropyl-functionalized silica-E (sample grafted in ethanol) and APS-T (sample grafted in toluene) were evaluated in carbon-carbon bond forming reactions such as the Knoevenagel condensation and the Claisen-Schmidt condensation. It has been found that the sample grafted in ethanol displayed better catalytic properties than the sample grafted in toluene. The surface silanol groups, which were proven to be more numerous in samples grafted in ethanol compared to those grafted in toluene, were found to be responsible for the enhanced catalytic activity in carbon-carbon bond forming reactions.

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Section: Introductionmentioning

confidence: 99%

A comparative study of aminopropyl-functionalized SBA-15 prepared by grafting in different solvents

Shang

Guan

et al. 2011

Reac Kinet Mech Cat

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“…The functionalization of silica using 3-aminopropyltriethoxysilane (APTS), which largely resembles the first step of our procedure, has been studied extensively using various spectroscopic techniques such as infrared, solid-state NMR, TGA and XPS [34,35]. These studies have shown that the presence of surface water strongly influences the resulting structure of the adsorbed APTS [36].…”

Section: Introductionmentioning

confidence: 99%

The mechanism for the controlled synthesis of highly dispersed vanadia supported on silica SBA-15

Heß

Wild

Schlögl

2006

Microporous and Mesoporous Materials

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The mechanism for the controlled synthesis of highly dispersed vanadia supported on mesoporous silica SBA-15 (VO x /SBA-15) is elucidated using X-ray photoelectron spectroscopy (XPS), Raman and diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS). The synthesis consists of functionalization of SBA-15 using 3-aminopropyltrimethoxysilane (APTMS) followed by HCl treatment, anion exchange of decavanadate (V 10 O 28 6-) and calcination to yield the final material. Spectroscopic analysis yields that APTMS is grafted onto the surface via hydroxyl groups. Under ambient conditions, protonated APTMS on SBA-15 is largely hydrolyzed and present in its bidentate and tridentate form. Detailed XPS analysis reveals a strong influence of surface water on the resulting structure of APTMS on SBA-15. Under dry conditions, the protonated APTMS molecules on SBA-15 adopt the monodentate and bidentate form. During the anion exchange reaction, decavanadate is incorporated intactly into the pores, without any changes in the structure of the organic framework. In the calcination step, decavanadate is decomposed and vanadia is anchored onto the surface of SBA-15 via silanol groups resulting in highly dispersed surface vanadia species, while the organic resiues are fully removed from the pores of the silica matrix. d

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“…The same phenomenon was also observed in SBA-15 silica. [34] In contrast, the functionalized CIMS samples have two remarkable weight losses from 275 to 525°C. The first weight loss at 250-300°C can be attributed to the surface dehydration and the combustion of the incorporated glycidoxypropyl groups outside pores, and the latter weight loss is due to the combustion of glycidoxypropyl groups inside pores of FCIMS.…”

Section: Surface Of Fcimsmentioning

confidence: 99%

Functionalization of Cubic Ia3d Mesoporous Silica for Immobilization of Penicillin G Acylase

Lü

Guo

et al. 2007

Adv Funct Materials

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Functionalized cubic Ia3d mesoporous silica (FCIMS) with glycidoxypropyl groups was prepared and characterized by powder XRD, N2 adsorption, TGA, FT‐IR spectroscopy, solid state 13C NMR spectroscopy and TEM, and studied as the support for the immobilization of Penicillin G acylase (PGA). The results show that the glycidoxypropyl groups have been chemically bonded to the silicon atoms on the surface of cubic Ia3d mesoporous silica (CIMS). The FCIMS materials possess the mesoporous structure with pore diameter of 8 nm which is ∼ 1 nm less than that of CIMS (9 nm). The influence of the amount of glycidoxypropyl groups on the initial specific activity and operational stability of PGA immobilized on FCIMS were examined for the hydrolysis of penicillin G potassium salt. The results show that PGA has been successfully immobilized covalently on the FCIMS materials, and the initial specific activity of PGA/FCIMS is 835 IU g–1 and PGA/CIMS is 624 IU g–1. After repeated use for 10 times, PGA/FCIMS retains 72 % of its initial specific activity and PGA/CIMS retains only 58 %.

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Preparation and characterization of (3-aminopropyl)triethoxysilane-modified mesoporous SBA-15 silica molecular sieves

Cited by 143 publications

References 27 publications

A comparative study of aminopropyl-functionalized SBA-15 prepared by grafting in different solvents

A comparative study of aminopropyl-functionalized SBA-15 prepared by grafting in different solvents

The mechanism for the controlled synthesis of highly dispersed vanadia supported on silica SBA-15

Functionalization of Cubic Ia3d Mesoporous Silica for Immobilization of Penicillin G Acylase

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