To provide a waste-gas treatment method for which a plate-like catalyst is utilized and by which development of gas blowing out part is lessened, deflection flow of a gas is suppressed and activity deterioration of the catalyst is prevented.
A unit is produced by forming a plurality of rows of reciprocally formed projecting linear parts 7 and recessed linear parts 7a with the same height and the same cross section shape in flat plate parts 9 and layering a plurality of a plate-like catalysts having opened boundary parts of the projecting linear parts and the recessed linear parts in a manner that the flat plate parts are brought into contact with the projected or the recessed linear parts of the neighboring plate-like catalysts. The unit is housed in a catalyst housing case 11 of which a waste gas flow inlet and outlet are opened and others are closed and is so installed as to set the projecting or recessed linear parts 7, 7a along the waste gas flowing direction 10 and then waste gas treatment is carried out by the unit.
YOSHIDA NAOMI
KATO YASUYOSHI
