Formation of ZSM-22 Zeolite Catalytic Particles by Fusion of Elementary Nanorods

An ZSM‐22 aluminosilicate zeolite was synthesized using the hydrothermal gel method at 150 °C. Products obtained after different synthesis times were characterized using various techniques and catalytic testing. Massive formation of ZSM‐22 nanocrystals occurs after only a short synthesis time, appea...

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Vydáno v:Chemistry : a European journal Ročník 13; číslo 36; s. 10070 - 10077
Hlavní autoři: Hayasaka, Kazuaki, Liang, Duoduo, Huybrechts, Ward, De Waele, Bart R., Houthoofd, Kristof J., Eloy, Pierre, Gaigneaux, Eric M., van Tendeloo, Gustaaf, Thybaut, Joris W., Marin, Guy B., Denayer, Joeri F. M., Baron, Gino V., Jacobs, Pierre A., Kirschhock, Christine E. A., Martens, Johan A.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Weinheim WILEY-VCH Verlag 01.01.2007
WILEY‐VCH Verlag
Témata:
aggregation
aluminum
crystal growth
microporous materials
zeolites
ISSN:0947-6539, 1521-3765
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Shrnutí:An ZSM‐22 aluminosilicate zeolite was synthesized using the hydrothermal gel method at 150 °C. Products obtained after different synthesis times were characterized using various techniques and catalytic testing. Massive formation of ZSM‐22 nanocrystals occurs after only a short synthesis time, appearing as isolated rods with a cross section of 12±4 nm. Nanorods have aluminum enriched at their external surface. Later in the crystallization process nanorods align and fuse sideways, whereby the external surface is systematically converted into an internal micropore surface. The formation of aluminum bearing micropores by the joining of nanorod surfaces is responsible for the enhanced catalytic activity. For this, the zeolite synthesis of nanoscale crystallites is ineffective for enhancing catalytic activity. Elementary aluminum nanorods: Zeolite ZSM‐22 crystals are formed by sideways aggregation of nanorods. These grow along the direction of the micropores until the silicon source is used up. Aluminum preferably resides in the outer sides of the rods. Only after the nanorods aggregate (see figure) are the catalytically active sites formed in abundance. This is one example where nanosize is not superior for a catalytic application.
Bibliografie:F.W.O.-Vlaanderen
istex:25051BDC006E2AA8CA22DF027AD3CBE801340E74
ArticleID:CHEM200700967
ark:/67375/WNG-L17G01PW-S
Belgian Government
Flemish FWO
Flemish IWT
Japan Cooperation Center, Petroleum and Nippon Oil Corporation
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0947-6539
1521-3765
DOI:10.1002/chem.200700967