Patent ID: 7351383

Claim:
An apparatus for catalytic treatment of a gas flow comprising: a device having a catalyzer body that includes a catalytic material, the device further comprising a plurality of first openings for one of ( 1 ) entry of gas into and ( 2 ) exit of gas out of the catalyzer body, and a second opening for one of ( 1 ) exit of the gas entering through the first openings and ( 2 ) entry of gas into the catalyzer body for subsequent exit through the first openings, and wherein the first openings are open outward from the catalyzer body on a portion of the body at a distance from a first delimiting surface thereof that defines a first end of the body, toward which delimiting surface the body is adapted to guide at least some of the incoming gas; the catalyzer body defines an essentially cylindrical shape with an inner cavity that is open toward a second end of the body and the second opening forms part of the inner cavity; and the catalyzer body further has a zigzag-shaped structure that forms a plurality of ducts for gas throughflow and that are arranged so that every other one of the plurality of ducts in the zigzag structure is connected to at least one of the first openings and remainder of said plurality of ducts are connected to the second opening whereby gas flows in opposite directions in adjacent ducts thereby maintaining uniform temperature over the catalytic material.