Synthesis and thermal stability of SOD-type SAPO-20 via interzeolite conversion of FAU-type SAPO-37 using tetramethylammonium hydroxide and piperidine
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN(2023)
摘要
Interzeolite conversion (IZC) of zeolites has attracted significant attention; however, research on silicoalumi-nophosphate zeolite system is still in its early stages. Herein, an IZC of an FAU-type silicoaluminophosphate zeolite (SAPO-37) is performed using tetramethylammonium hydroxide (TMAOH) and piperidine as organic additives. For comparison, conventional hydrothermal synthesis using an amorphous precursor instead of SAPO-37 is also performed. Using TMAOH, SOD-type silicoaluminophosphate zeolites (SAPO-20) are obtained from both parent SAPO-37 and the amorphous precursor. However, in the case of piperidine, SAPO zeolites with different topologies are obtained from parent SAPO-37 and the amorphous precursor; that is, SOD-type SAPO-20 is obtained from parent SAPO-37, and CHA-type silicoaluminophosphate (SAPO-34) is obtained from the amorphous precursor. Piperidine molecules, as organic additives, are observed to be occluded in the cages of the obtained SAPO-20. The characteristics and thermal stability of the as-synthesized SAPO-20 are analyzed in detail. (c) 2023 The Ceramic Society of Japan. All rights reserved.
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关键词
Zeolite, Interzeolite conversion, Silicoaluminophosphate, Thermal stability
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