Provided is a carbon dioxide recovery system that separates CO.sub.2 from a CO.sub.2-containing gas containing CO.sub.2 by an electrochemical reaction, and comprises an electrochemical cell comprising a working electrode containing a CO.sub.2 adsorbent, and a counter electrode. Application of a voltage between the working electrode and the counter electrode causes electrons to be supplied from the counter electrode to the working electrode, and enables the CO.sub.2 adsorbent to bind to CO.sub.2 as electrons are supplied. The CO.sub.2 adsorbent is a crystalline porous body, and has a molecular structure in which a functional group that exchanges electrons and binds to CO.sub.2 is regularly arranged.

A method and system for reducing ion concentration of a solution and converting gas. The system comprising a multi-chamber unitary dialysis cell comprising a gas chamber, a product chamber, and an acid chamber. Ion exchange barriers separate the chambers of the dialysis cell. A first anion exchange barrier is positioned between the product chamber and the acid chamber and a first cation exchange barrier is positioned between the product chamber and the gas chamber. Anions from the solution being treated associate with cations from the acid chamber to form an acid solution in the acid chamber, and cations from the solution being treated associate with anions from the fluid comprising gas to form salt, thereby reducing the ion concentration of the solution being treated and converting at least a portion of the gas into salt.

The invention relates to a method for purifying a carrier gas which comprises oxygenated impurities in a first oxidation degree, the purification method comprising the circulation, advantageously uninterrupted, of the carrier gas through and along a direction XX′ of a filter, the filter being made of an oxygen scavenger material which has a redox potential E°, and of which a first portion is in a reduced redox state and within which the oxygenated impurities are scavenged and/or pass from the first oxidation degree to a second oxidation degree, the method further comprising the application to the filter of a greater electric potential ΔV, as an absolute value, than the redox potential E° during a main purification cycle CP.

An environment control system utilizes oxygen and humidity control devices that are coupled with an enclosure to independently control the oxygen concentration and the humidity level within the enclosure. An oxygen depletion device may be an oxygen depletion electrolyzer cell that reacts with oxygen within the cell and produces water through electrochemical reactions. A desiccating device may be g, a dehumidification electrolyzer cell, a desiccator, a membrane desiccator or a condenser. A controller may control the amount of voltage and/or current provided to the oxygen depletion electrolyzer cell and therefore the rate of oxygen reduction and may control the amount of voltage and/or current provided to the dehumidification electrolyzer cell and therefore the rate of humidity reduction. The oxygen level may be determined by the measurement of voltage and a limiting current of the oxygen depletion electrolyzer cell. The enclosure may be a food or artifact enclosure.

Provided is an electrochemical cell comprising a working electrode and a counter electrode. The working electrode comprises an electrode base material, a CO.sub.2 adsorbent, and a binder. Application of a voltage between the working electrode and the counter electrode causes electrons to be supplied from the counter electrode to the working electrode, and enables the CO.sub.2 adsorbent to bind to CO.sub.2 as electrons are supplied. The binder has electrical conductivity, and the CO.sub.2 adsorbent is held in the electrode base material by the binder.

An electrochemical system utilizes an anion conducting layer disposed between an anode and a cathode for transporting a working fluid. The working fluid may include carbon dioxide that is dissolved in water and is partially converted to carbonic acid that is equilibrium with bicarbonate anion. An electrical potential across the anode and cathode creates a pH gradient that drives the bicarbonate anion across the anion conducting layer to the cathode, wherein it is reformed into carbon dioxide. Therefore, carbon dioxide is pumped across the anion conducting layer.

A fluid flow path has an introduction unit, an outflow unit, and contact units. The introduction unit is formed on a surface of a cathode-side primary flow path structure opposite to a cathode as an elongated recess with a width smaller than that of a tube. The tube abuts against the introduction unit so as to straddle the introduction unit. The outflow unit is formed on a surface of the cathode-side primary flow path structure opposite to the cathode as an elongated recess with a width smaller than that of the tube. The tube abuts against the outflow unit so as to straddle the outflow unit. The contact unit is formed in the groove shape on a surface of the cathode-side primary flow path structure on the cathode side. The contact unit has its upstream end connected to the introduction unit and its downstream end connected to the outflow unit.

A system and method for processing unconditioned syngas first removes solids and semi-volatile organic compounds (SVOC), then removes volatile organic compounds (VOC), and then removes at least one sulfur containing compound from the syngas. Additional processing may be performed depending on such factors as the source of syngas being processed, the products, byproducts and intermediate products desired to be formed, captured or recycled and environmental considerations.

An electrochemical hydrogen pump according to the present disclosure includes: a cell including an electrolyte membrane, an anode disposed on a first main surface of the electrolyte membrane, and a cathode disposed on a second main surface of the electrolyte membrane; a voltage applicator applying a voltage between the anode and the cathode, the voltage applicator applying the voltage to cause the electrochemical hydrogen pump to transfer hydrogen in hydrogen-containing gas supplied to the anode to the cathode and to pressurize the hydrogen; and a controller, when at least one selected from the group consisting of a dew point of the hydrogen-containing gas supplied to the anode and a temperature of the cell is increased, controlling the voltage applied by the voltage applicator to increase a current flowing between the anode and the cathode.

The invention relates to a solid-state compressor for electrochemically compressing a fluid, including: a compressor cell stack, including at least one compressor cell having a membrane electrode assembly sandwiched between two cell plates, an enclosure, clamping the compressor cell stack at opposing sides thereof, and at least one contact body, interposed between the compressor cell stack and the enclosure and contacting an outer surface of the compressor cell stack, wherein a space is enclosed between the enclosure and the contact body, which space is configured to contain a hydraulic fluid under pressure. The invention further relates to a method for operating such a solid-state compressor.