Selective crystallization of CoAPO-34 and VAPO-5 molecular sieves under microwave irradiation in an alkaline or neutral condition

被引:48
作者
Jhung, SH
Lee, JH
Yoon, JW
Hwang, JS
Park, SE [1 ]
Chang, JS
机构
[1] Inha Univ, Dept Chem, Inchon 402751, South Korea
[2] Korea Res Inst Chem Technol, Res Ctr Nanocatalysis, Taejon 305600, South Korea
关键词
AFI molecular sieve; CHA molecular sieve; phase selectivity; microwave irradiation; alkaline condition;
D O I
10.1016/j.micromeso.2004.11.013
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
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.
引用
收藏
页码:147 / 152
页数:6
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