US 11,219,858 B2 · Electrochemical capture of Lewis acid gases

Abstract

Methods, apparatuses, and systems related to electrochemical capture of Lewis acid gases from fluid mixtures are generally described. Certain embodiments are related to electrochemical methods involving selectively removing a first Lewis acid gas from a fluid mixture containing multiple types of Lewis acid gases (e.g., a first Lewis acid gas and a second Lewis acid gas). Certain embodiments are related to electrochemical systems comprising certain types of electroactive species having certain redox states in which the species is capable of binding a first Lewis acid gas but for which binding with a second Lewis acid gas is thermodynamically and/or kinetically unfavorable. The methods, apparatuses, and systems described herein may be useful in carbon capture and pollution mitigation applications.

Claims58

Dependent claims

An electrochemical apparatus, comprising:

a chamber comprising a negative electrode in electronic communication with an electroactive species, the chamber constructed to receive a fluid mixture;
wherein, in at least one conductive medium, the electroactive species has:
an oxidized state;
and
at least one reduced state in which the electroactive species is capable of bonding with a first Lewis acid gas, but for which a reaction with a second Lewis acid gas comprising one or more species chosen from carbon dioxide, nitrogen oxides, R3B, or R2S is thermodynamically and/or kinetically unfavorable at at least one temperature, wherein each R is independently H, branched or unbranched C1-C8 alkyl, aryl, cyclyl, heteroaryl, or heterocyclyl.

2 more elements

A method, comprising:

exposing a fluid mixture comprising a first Lewis acid gas and a second Lewis acid gas to one or more electroactive species in a reduced state;
bonding an amount of the first Lewis acid gas to a first portion of the one or more electroactive species in the reduced state to form first Lewis acid gas-electroactive species complexes;
bonding an amount of the second Lewis acid gas to a second portion of the one or more electroactive species in the reduced state to form second Lewis acid gas-electroactive species complexes;
and
oxidizing at least some of the second Lewis acid gas-electroactive species complexes such that an amount of the second Lewis acid gas is released from the second Lewis acid gas-electroactive species complexes while releasing essentially none of the first Lewis acid gas from the first Lewis acid gas-electroactive species complexes or releasing an amount of the first Lewis acid gas from the first Lewis acid gas-electroactive species complexes that is less than or equal to 10% of the first Lewis acid gas-electroactive species complexes by mole percent.

2 more elements

Dependencies are inferred from the claim text.

Electrochemical capture of Lewis acid gases

Life of this patent

Electrochemical capture of Lewis acid gases

Life of this patent

Abstract

Claims58