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ID 34806
file
creator
Goto, Ikuhiro
Itakura, Masaya
Shibata, Syohei
Honda, Koutaro
Ide, Yusuke
subject
Hydrothermal conversion
Interzeolite conversion
LEV-type zeolite
CHA-type zeolite
Less dense zeolite
NDC
Biology
abstract
Hydrothermal conversion of LEV-type zeolite into CHA-type zeolite occurred in the absence of both an organic structure-directing agent and a seed crystal. The LEV-CHA transformation proceeds from a more dense zeolite (LEV) to a less dense one (CHA). When amorphous aluminosilicate hydrogels were used as starting materials, the CHA-type zeolite was not obtained under the present hydrothermal synthesis conditions. From the fact that the LEV-CHA transformation proceeded at lower alkalinity conditions, it was suggested that locally ordered aluminosilicate species (nanoparts) produced by decomposition/dissolution of the starting LEV-type zeolite contribute to the transformation process. On the other hand, at higher alkalinity than that used for the CHA-type zeolite synthesis, LEV-LTA transformation occurred effectively and selectively. These results suggest that there is a large difference in the structures of nanoparts generated by decomposition/dissolution of the starting zeolite in the LEV-CHA and LEV-LTA transformations.
journal title
Microporous and Mesoporous Materials
volume
Volume 158
start page
117
end page
122
date of issued
2012
publisher
Elsevier Science BV
issn
1387-1811
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
author
rights
(c) 2012 Elsevier Inc. All rights reserved.
relation url
department
Graduate School of Engineering