Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 164, Issue -, Pages 88-92Publisher
ELSEVIER
DOI: 10.1016/j.micromeso.2012.06.036
Keywords
ITQ-37; Chiral zeolite; Extra-large pore; Structure-directing agent; Hydrothermal synthesis
Categories
Funding
- State Basic Research Project of China [2011CB808703]
- National Natural Science Foundation of China
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The chiral zeolite germanosilicate ITQ-37 has been prepared by using a new achiral organic structure-directing agent 3',4'-dihydro-1 H-spiro[isoindoline-2,2'-isoquinolin]-2-ium (denoted as OSDA-1). The crystallization field diagram and the influence of synthetic factors on the synthesis of ITQ-37, such as crystallization temperature, crystallization time, source materials, and water amount have been studied. The as-synthesized samples have been characterized by XRD, ICP, CHN, TG, TEM, DLS, NMR, N-2 adsorption and NH3-TPD analysis. The results indicate that the as-synthesized ITQ-37 is a pure phase, and the particle size is of ca. 200 nm. The OSDA-1 cations remain intact in the final product and the framework structure of ITQ-37 maintains up to 500 degrees C after the removal of OSDA. In addition, Al atoms can be introduced into the framework of germanosilicate ITQ-37 with the Al/(Si + Ge) molar ratio of ca. 1/160-1/80, forming Al-ITQ-37 mainly with weak acid sites. (C) 2012 Elsevier Inc. All rights reserved.
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