期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 80, 期 1-3, 页码 147-152出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2004.11.013
关键词
AFI molecular sieve; CHA molecular sieve; phase selectivity; microwave irradiation; alkaline condition
Syntheses of cobalt- and vanadium-incorporated aluminophosphate molecular sieves (CoAPO and VAPO) with AFI and CHA structures have been studied using an alkaline or neutral gel under microwave irradiation and conventional hydrothermal heating. Microwave synthesis gives rise to the selective crystallization of CoAPO-34 with a CHA structure and VAPO-5 with an AFI structure, while the conventional hydrothermal crystallization brings CoAPO-5 and VAPO-34 through the gradual transformation of CoAPO-34 and VAPO-5, respectively, as the crystallization time increases. These results reveal that the relative stabilities of metal-incorporated aluminophosphate (MeAPO) molecular sieves between AFI and CHA structures depend on the type of incorporated metal ions. This work also suggests that microwave syntheses of MeAPO molecular sieves preferentially induce a kinetically favorable MeAPO phase in a short period of crystallization time. The synthesis of VAPO-5 in an alkaline condition is for the first time reported in this work. (c) 2004 Elsevier Inc. All rights reserved.
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