Formation of ZSM-22 zeolite catalytic particles by fusion of elementary nanorods

Autor: Joeri Denayer, Johan A. Martens, Joris W. Thybaut, Gustaaf Van Tendeloo, Christine E. A. Kirschhock, Pierre Jacobs, Kazuaki Hayasaka, Kristof Houthoofd, Duoduo Liang, Bart R. De Waele, Pierre Eloy, Eric M. Gaigneaux, Guy Marin, Gino V. Baron, Ward Huybrechts
Přispěvatelé: Chemical Engineering and Industrial Chemistry, Chemical Engineering and Separation Science
Jazyk: angličtina
Rok vydání: 2007
Předmět:
Zdroj: Chemistry: a European journal
Vrije Universiteit Brussel
ISSN: 0947-6539
Popis: An ZSM-22 aluminosilicate zeolite was synthesized using the hydrothermal gel method at 150 degrees 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.
Databáze: OpenAIRE
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