Prussian blue is a porous coordination polymer consisting of metal and cyano-group as a ligand. Because of the small size of the cyano-group, it is expected the adsorbent or storage for small molecules and ions. In particular, a Prussian blue analog was found to be a NH3 adsorbent with the highest capacity. In this paper, we discuss the adsorption mechanism of NH3 by Prussian blue analogs, where the two-step adsorption mechanism is essential: NH3-adsorption onto open-metal site at vacancies and following conversion into NH4+ by taking H+ over from a crystal water. The two-step mechanism brings the high amount and speed of the adsorption even from the trace NH3 atmosphere. With the property, we demonstrate the two applications: one is an odor-removal agent and the other is an enhancer for a NH3 sensor with low-detection limit.

Mechanism of rapid NH3 adsorption by Prussian blue analogues

256th National Meeting (2018)

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