Rational reactor design for the in-situ electrosynthesis of salt-free hydrogen peroxide.

Research output: Contribution to conferenceAbstract

Abstract

Poster and abstract:Electrochemical production of the strong oxidant hydrogen peroxide (H2O2) combines the use of abundant reactants with low emissions and safe working conditions. On-site H2O2 production systems can be applied in water treatment and other environmental applications, if the H2Ocomes in a salt-free solution. However, for electrosynthesis in two-compartment cells this is impossible. To obtain a salt-free solution, a three-compartment cell is used. The third compartment is sandwiched between anolyte and catholyte, shielded by membranes, and it is filled with a solid electrolyte to provide conductivity. Membranes prevent H2Ofrom reaching the anode, where it can be consumed, and they shield the salt-free H2O2 solutions from most ions.
Energy use in such a system is governed by the characteristics of the resin and membranes, and by flow velocity, H2O2 efficiency, electrolyte concentration. These parameters are all integrated in a mathematical model of a lab-scale system. The outcomes of this model are analyzed through a lens of experimental results derived from a corresponding lab-scale reactor. Herewith we establish a theory of mass transport, new to H2Osynthesis, as a function of resin bed geometry and properties. This model is useful for rational design of and choice of material for the H2Osynthesis cell.
We will present results concerning mass transport in spherical resin particles. Since spherical particles present a complex matrix, we have narrowed down the plethora of possible transport pathways to just three types; transport solely through liquid, solely through resin, and a pathway that combines the two. In this model we describe the potential, and the species concentration as functions of position, electrolyte concentration, and current density. We also describe the resin bed properties with dimensionless numbers, which is necessary to describe transport properties of reactors at larger scale.
Original languageEnglish
Publication statusPublished - 3 Jun 2020
EventEnvironmental Technology for Impact 2020 - Online
Duration: 3 Jun 20205 Jun 2020
https://www.melpro.cz/#

Conference

ConferenceEnvironmental Technology for Impact 2020
Period3/06/205/06/20
Internet address

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