| Hierarchically structured meso-macroporous aluminosilicates with high tetrahedral aluminium content in acid catalysed esterification of fatty acids. | |
| | |
MedLine Citation:
|
PMID: 21875708 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
|
A simple synthesis pathway has been developed for the design of hierarchically structured spongy or spherical voids assembled meso-macroporous aluminosilicates with high tetrahedral aluminium content on the basis of the aqueous polymerisation of new stabilized alkoxy-bridged single molecular precursors. The intimate mixing of an aluminosilicate ester (sec-BuO)(2)-Al-O-Si(OEt)(3) and a silica co-reactant (tetramethoxysilane, TMOS) with variable ratios and the use of alkaline solutions (pH 13.0 and 13.5) improve significantly the heterocondensation rates between the highly reactive aluminium alkoxide part of the single precursor and added silica co-reactant, leading to aluminosilicate materials with high intra-framework aluminium content and low Si/Al ratios. The spherically-shaped meso-macroporosity was spontaneously generated by the release of high amount of liquid by-products (water/alcohol molecules) produced during the rapid hydrolysis and condensation processes of this double alkoxide and the TMOS co-reactant. It has been observed that both pH value and Al-Si/TMOS molar ratio can strongly affect the macroporous structure formation. Increasing pH value, even slightly from 13 to 13.5, can significantly favour the incorporation of Al atoms in tetrahedral position of the framework. After the total ionic exchange of Na(+) compensating cations, catalytic tests of obtained materials were realised in the esterification reaction of high free fatty acid (FFA) oils, showing their higher catalytic activity compared to commercial Bentonite clay, and their potential applications as catalyst supports in acid catalysed reactions. |
| | |
Authors:
|
Arnaud Lemaire; Quan-Yi Wang; Yingxu Wei; Zhongmin Liu; Bao-Lian Su |
Related Documents
:
|
173708 - Spore membrane(s) as the site of damage within heated clostridium perfringens spores. 21764298 - A novel mechanism and kinetic model to explain enhanced xylose yields from dilute sulfu... 15854698 - A model of the specific growth rate inhibition by weak acids in yeasts based on energy ... 11733028 - Molecular cloning and characterization of isomultiflorenol synthase, a new triterpene s... 7126608 - N-acylation of ethanolamine phospholipids in canine myocardium. 20397628 - Specific protein regions influence substrate specificity and product length in polyunsa... |
Publication Detail:
|
Type: JOURNAL ARTICLE Date: 2011-8-12 |
Journal Detail:
|
Title: Journal of colloid and interface science Volume: - ISSN: 1095-7103 ISO Abbreviation: - Publication Date: 2011 Aug |
Date Detail:
|
Created Date: 2011-8-30 Completed Date: - Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 0043125 Medline TA: J Colloid Interface Sci Country: - |
Other Details:
|
Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
|
Copyright © 2011 Elsevier Inc. All rights reserved. |
Affiliation:
|
Laboratory of Inorganic Materials Chemistry (CMI), University of Namur (FUNDP), 61 rue de Bruxelles, B-5000 Namur, Belgium. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Determination of chloropropanols in foods by one-step extraction and derivatization using pressurize...
Next Document: Immobilization of uricase in Langmuir and Langmuir-Blodgett films of fatty acids and a possible uric...