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首页> 外文期刊>Chemistry: A European journal >Microwave effect in the fast synthesis of microporous materials: Which stage between nucleation and crystal growth is accelerated by microwave irradiation?
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Microwave effect in the fast synthesis of microporous materials: Which stage between nucleation and crystal growth is accelerated by microwave irradiation?

机译：微波效应在微孔材料的快速合成中：微波辐射加速成核和晶体生长之间的阶段？

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摘要

Microporous materials, such as silicalite-1 and VSB-5 molecular sieves, have been synthesized by both microwave irradiation (MW) and conventional electric heating (CE). The accelerated syntheses by microwave irradiation can be quantitatively investigated by various heating modes conducted in two steps such as MW-MW, MW-CE, CE-MW, and CE-CE (in the order of nucleation-crystal growth). In the case of synthesis by MW-CE or CE-MW, the heating modes were changed for the second step just after the appearance of X-ray diffraction peaks in the first step. We have quantitatively demonstrated that the microwave irradiation accelerates not only the nucleation but also crystal growth. However, the contribution to decrease the synthesis time by microwave irradiation is larger in the nucleation stage than in the step of crystal growth. The crystal size increases in the order of MW-MW < MW-CE approximate to CE-MW < CE-CE synthesis. The fast crystal growth and small crystal size observed in the synthesis from microwave-nucleated precursor can be explained in terms of the fact that the microwave-nucleated samples have higher population of nuclei with smaller size than the samples nucleated by conventional heating.
机译：通过微波辐射（MW）和常规电加热（CE）合成了微孔材料，例如硅藻土-1和VSB-5分子筛。可以通过两步（MW-Ce，Ce-MW和Ce-Ce（按成核晶体生长顺序）通过两步进行微波辐射的加速合成。在通过MW-Ce或Ce-Mw合成的情况下，在第一步中的X射线衍射峰的外观之后，在第二步改变加热模式。我们已经定量表现出微波辐射不仅加速核心而且还加速了晶体生长。然而，通过微波辐射降低合成时间的贡献比在晶体生长步骤中的成核阶段更大。晶体尺寸随着MW-MW

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