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Synthesis of NaA zeolite membrane by microwave heating

机译：微波加热合成NaA分子筛膜

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摘要

The synthesis of NaA zeolite membrane on a porous #alpha#-Al_2O_3 support by microwave heating (MH) was investigted. the formation of a NaA zeolite membrane was drastically promoted by MH. The synthesis time wa reduced from 3 h for conventional heating (CH) to 15 min for MH. Surface seeding cannot only promote the formation of NaA zeolite on the support, but also inhibit the transformation of NaA zeoltie into other types of zeolites. The thickness of the naA zeolite membrane synthesized by MH was about 4 #mu#m, thinner than that of NaA zeolite membrane synthesized by CH. the permeance of NaA zeolite membrane synthesized by MH was four times higher than of the NaAS zeolite membrane synthesized by Ch, while their permselectivities were comparable. Multi-state synthesis resulted in the transformation of naA zeolite into other types of zeolite, and the perfection of the as-syntheszed membrane decreased. the formation mechanism of NaA zeolite membrane on the porous #alpha#-Al_2O_3 support by MH was proposed. The promotion effect on the formation of naA zeolite membrane by MH can be divided into two parts: the "thermal effect" and the "microwave effect". The formation of a homogeneous and thin NaA zeolite membrane resulted from both the "thermal effect" and the "microwave effect", while the fast formation of NaA zeolite membrane was mainly caused by the "microwave effect".
机译：研究了通过微波加热（MH）在多孔＃alpha＃-Al_2O_3载体上合成NaA沸石膜的过程。 MH大大促进了NaA沸石膜的形成。合成时间从常规加热（CH）的3小时减少到MH的15分钟。表面接种不仅可以促进载体上NaA沸石的形成，而且可以抑制NaA沸石转变成其他类型的沸石。 MH合成的NaA沸石膜的厚度约为4＃μm，比CH合成的NaA沸石膜的厚度薄。 MH合成的NaA沸石膜的渗透率是Ch合成的NaAS沸石膜的渗透率的四倍，而它们的渗透性相当。多态合成导致naA沸石转变为其他类型的沸石，并且合成膜的完美性降低。提出了MH在＃alpha＃-Al_2O_3多孔载体上NaA分子筛膜的形成机理。 MH对naA沸石膜形成的促进作用可分为两部分：“热效应”和“微波效应”。均匀且薄的NaA沸石膜的形成是由“热效应”和“微波效应”引起的，而NaA沸石膜的快速形成主要是由“微波效应”引起的。

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