A Bipyridine-Based Conjugated Microporous Polymer for the Ir-Catalyzed Dehydrogenation of Formic Acid

Formic acid is considered a promising energy storage medium, and its selective dehydrogenation enables the generation of high-purity H-2. Herein we report a bipyridine-based conjugated microporous polymer (CMP) loaded with [Cp*IrCl2](2) for the base-free aqueous dehydrogenation of formic acid to H-2/CO2. This catalyst exhibits high activity and selectivity at temperatures over 130 degrees C and with formic acid concentrations as high as 10 M. Recycling tests demonstrate a low Ir leaching and a gradual increase in the activity over six runs and a low CO content in the gas phase of about 138 ppm. TOFs of up to 123894 h(-1) were obtained using 0.1 wt % Ir loading.