Conceptual study on extraction of formic acid from the electrolyte after electroreduction of CO: Desalination and dehydration using a high-silica chabazite zeolite membrane.

Here, we propose a two-step pervaporation system with a high-silica CHA (chabazite) membrane, which has sufficient resistance to water and acid, to demonstrate the extraction and condensation of the formic acid formed by electroreduction of CO. The kinetic diameters of water and formic acid are similar and smaller than the pore size of CHA, while the hydrated electrolyte ions (e.g.