The Effects of Processing Parameters on the Synthesis of Siliceous MCM-41 from Colloidal Silicas

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Title:The Effects of Processing Parameters on the Synthesis of Siliceous MCM-41 from Colloidal Silicas
Creators:
Rathouský, Jiří
Zukalová, Markéta
Zukal, Arnošt
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 63, 2, pp. 271-282
Uncontrolled Keywords:Siliceous MCM-41 mesoporous molecular sieves, Phase purity, Synthesis optimization

Abstract

Well-ordered as-synthesized siliceous MCM-41 mesoporous molecular sieves can be prepared from the sol of colloidal silica (Ludox HS-40 and AS-40) only under optimized conditions. Two processing parameters have a significant effect on the structure. First, the period of stirring the mixture of Ludox AS-40 or HS-40 and tetraethylammonium hydroxide should be extended to 22 h. Second, the following temperature regime should be used: the reaction mixture consisting of colloidal silica, tetraethylammonium hydroxide, hexadecyltrimethylammonium chloride and water is being first aged at ambient temperature for 20 h, then the temperature is gradually increased and finally the mixture is kept at 100 °C for 40 h. As-made MCM-41 prepared even by an optimized procedure contains after calcination some proportion of an amorphous phase. Extraction with water of the as-made material is a suitable procedure for the improvement of the phase purity as less well-ordered and amorphous particles are preferentially dissolved and thus removed. In this way, a substantial improvement in the quality of MCM-41 molecular sieves can be achieved.

Title:The Effects of Processing Parameters on the Synthesis of Siliceous MCM-41 from Colloidal Silicas
Creators:
Rathouský, Jiří
Zukalová, Markéta
Zukal, Arnošt
Uncontrolled Keywords:Siliceous MCM-41 mesoporous molecular sieves, Phase purity, Synthesis optimization
Divisions:Life and Chemical Sciences > Institute of Organic Chemistry and Biochemistry > Collection of Czechoslovak Chemical Communications
Journal or Publication Title:Collection of Czechoslovak Chemical Communications
Volume:63
Number:2
Page Range:pp. 271-282
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc19980271UNSPECIFIED
ID Code:1294
Item Type:Article
Deposited On:06 Feb 2009 17:08
Last Modified:06 Feb 2009 16:08

Citation

Rathouský, Jiří; Zukalová, Markéta; Zukal, Arnošt (1998) The Effects of Processing Parameters on the Synthesis of Siliceous MCM-41 from Colloidal Silicas. Collection of Czechoslovak Chemical Communications, 63 (2). pp. 271-282. ISSN 0010-0765

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