ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Mesoporous titanosilicates were directly synthesised at ambient temperature and pressure,considering a wide range of metal content (0.01≤Ti/Si≤0.5) and using cationic surfactants ofdifferent alkyl chain length. It is shown that the use of tetradecyl-, hexadecyl- andoctadecyltrimethylammonium bromide as structure-directing agents provide higher qualityTi-MCM-41 materials, than those prepared with surfactants of shorter alkyl chain. The pore volumeand surface areas are gradually reduced by the increase of Ti content but up to Ti/Si=0.02 thealterations in the pore structural properties are negligible as compared with pure silica grades,becoming more noticeable for Ti/Si≥0.1. Nevertheless, for Ti/Si=0.1 the directly synthesisedmaterials still have high pore volumes as well as high regularity and uniformity of the hexagonalpore array, with superior pore structural properties to those of materials prepared by post synthesisdeposition of titanium on silica MCM-41, which did not provide a valid alternative for minimisingthe disruptive effect of high metal content on the hexagonal porous structure
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.587-588.473.pdf
Permalink
