期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 158, 期 -, 页码 117-122出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2012.03.032
关键词
Hydrothermal conversion; Interzeolite conversion; LEV-type zeolite; CHA-type zeolite; Less dense zeolite
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. (C) 2012 Elsevier Inc. All rights reserved.
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