Characterization of Mixing Performance in a Microreactor and its Application to the Synthesis of Porous Coordination Polymer Particles

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  • マイクロリアクタの混合特性評価と多孔性錯体微粒子合成への適用
  • マイクロリアクタ ノ コンゴウ トクセイ ヒョウカ ト タコウセイ サクタイ ビリュウシ ゴウセイ エ ノ テキヨウ

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Abstract

Here we quantitatively evaluated the mixing performance of a tailor-made microreactor with central-collision type through the iodide/iodate chemical test reaction, and applied the microreactor to the synthesis of zeolitic imidazolate framework-8 （ZIF-8）, which is a subclass of porous coordination polymers （PCPs） or metal organic frameworks （MOFs）. The chemical test reaction demonstrated excellent mixing performance of the microreactor with a characteristic mixing time shorter than 1 millisecond, which is approximately 100 times faster than those of a batch reactor and a millimeter-sized Y-shaped mixer. Taking advantage of the rapid and uniform mixing, the microreactor successfully produced ZIF-8 particles with high reproducibility by simply mixing aqueous solutions of zinc nitrate and 2-methylimidazole. The synthesis at room temperature resulted in ZIF-8 particles with chamfered cube shape, while a lower temperature of 5℃ produced raspberry-type spherical particles. We confirmed that prepared ZIF-8 particles have BET surface area of ～1500 m2/g and exhibit the gate adsorption behavior caused by the structural transition of the ZIF-8 framework.

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