Hitachi Zosen Corporation

Jx Nippon Oil Energy Corporation

Masanobu Aizawa

Ken-ichi Sawamura

Takehiro Shimizu

Kazuya Kameyama

Suguru Fujita

Sousuke Nishiura

Ken-Ichi Sawamura

A metal-air battery () includes a tubular positive electrode () centered on a predetermined central axis (J), a negative electrode () opposing an inner side surface of the positive electrode, and an electrolyte layer () disposed between the negative electrode and the positive electrode. The positive electrode includes a positive electrode conductive layer (), a positive electrode catalyst layer (), and a positive electrode current collector (). The positive electrode catalyst layer is formed on the outer side surface of the tubular positive electrode conductive layer centered on the central axis and has lower electrical conductivity than the positive electrode conductive layer. The positive electrode current collector is formed on an area of the outer side surface of the positive electrode conductive layer where the positive electrode catalyst layer does not exist, to be in direct contact with the outer side surface. This structure reduces the electrical resistance between the positive electrode conductive layer and the positive electrode current collector and improves battery performance. Since the thickness in the radial direction of the positive electrode current collector is greater than that of the positive electrode catalyst layer, the positive electrode current collector and a connection terminal can be easily connected to each other.

Metal-air battery

In a metal-air battery (), an interconnector () formed of ceramic having alkali resistance is provided on the surface of a porous positive electrode layer () on the side opposite to the surface that is in contact with an electrolyte layer (). A liquid repellent layer () having liquid repellency to an electrolyte solution is further provided on the surface of the positive electrode layer () on which the interconnector () is formed, and covers this surface along with the interconnector (). The metal-air battery () using an alkaline electrolyte solution can thus easily prevent leakage of the electrolyte solution by the interconnector () and the liquid repellent layer () while suppressing degradation of the interconnector ().

The carbon dioxide membrane separation system in a coal gasification process contains introduction of a mixed gas of hydrogen (H) and carbon dioxide (CO) in a high temperature and high pressure condition generated through water gas shift reaction from a water gas shift reaction furnace, while maintaining the temperature and pressure condition, to a zeolite membrane module containing a zeolite membrane for removing carbon dioxide, thereby removing carbon dioxide and generating a fuel gas rich in hydrogen. The fuel gas rich in hydrogen in a high temperature and high pressure condition discharged from the zeolite membrane module is fed to a gas turbine of the power generation facility while maintaining the temperature and pressure condition.

Carbon dioxide membrane separation system in coal gasification process, and integrated coal gasification combined cycle power generation facility using same

In a carbon dioxide recovery method including a carbon dioxide absorption step of bringing a gas to be treated containing carbon dioxide into contact with a carbon dioxide absorbing liquid, thereby removing carbon dioxide from the gas to be treated, and a regeneration step of removing carbon dioxide from a rich solution that has absorbed carbon dioxide in the carbon dioxide absorption step, thereby achieving regeneration, the rich solution that has absorbed carbon dioxide is guided in liquid form to a membrane separation apparatus () that is selectively permeable to carbon dioxide and equipped with a zeolite membrane for carbon dioxide separation, carbon dioxide is separated and removed by a pervaporation method, and the carbon dioxide absorbing liquid is thus regenerated.

Method for regenerating carbon dioxide absorbing liquid in carbon dioxide recovery method

A metal-air battery () includes a negative electrode (), a positive electrode (), and an electrolyte layer () disposed between the negative electrode () and the positive electrode (). The negative electrode () includes a base member () which has a coiled shape and is formed of a conductive material and a deposited metal layer () in powder or particle state, which is formed on a surface of the base member () by electrolytic deposition. The electrolyte layer () contains an alkaline aqueous solution which contains the same metal as the deposited metal layer (), and the positive electrode () has a tubular shape which is concentric with the negative electrode () having the coiled shape and surrounds the negative electrode (). In this metal-air battery (), it is possible to suppress occurrence of dendrites in the negative electrode ().

Electrode, metal-air battery, and electrode manufacturing method

To provide a COmembrane separation and recovery system that is excellent in COpermeability and COseparation selectivity on recovery of COin a hydrogen production process and the like. The COmembrane separation and recovery system of the present invention comprises a dehydration treatment module () preliminary to a COmembrane separation module (), the COmembrane separation module () comprises a hydrophilic zeolite membrane () that exhibits COselective permeability and is formed on a porous substrate, and the hydrophilic zeolite membrane () is subjected to a dehydration treatment by a heat treatment at from 100 to 800&#xb0; C.

Growing community of inventors

Osaka, Japan

Masanobu Aizawa