PURPOSE: To remove carbon dioxide in an exhaust gas with high reaction speed and without heating and compressing the exhaust gas and to recover a reaction product as a substance being industrially usable and useful and as a liq. or solid substance being easily recoverable.
CONSTITUTION: An exhaust gas 1 contg. a hydrogen source 2 consisting of at least one of hydrogen gas and a gaseous hydrogen compd. and carbon dioxide is irradiated with a high energy beam 6 to activate the hydrogen source 2 and the carbon dioxide and carbon dioxide in the exhaust gas l is reduced with the activated hydrogen to convert it into a solid compd. or a liq. compd., which is recovered. In addition, it is pref. that a mesh material for accelerating the reduction reaction between the activated hydrogen source and carbon dioxide in the exhaust gas 1 is placed into multi-stages in a reaction vessel 7. In addition, they are set so as to decrease gradually the opening of the mesh material along the flow direction of the mixed gas. In addition, it is pref. that the cross- sectional area of the reaction vessel 7 is formed so as to decrease gradually it along the flow direction of the mixed gas.
ISHIWATARI YUTAKA
ITO YOSHIYASU
