CATALYST COMPRISING COATED SUBSTRATE

摘要

A catalyst comprising a substrate (10) comprising at least one passage (20) defined in part by a wall (12), which wall comprising at least one inlet (13) and at least one outlet (14), wherein the sum of the cross-sectional areas of the or each outlet (14) being greater than the sum of the cross sectional areas of the or each inlet (13) whereby the linear flow velocity of a fluid at a point downstream of the at least one outlet (14) is less than the linear flow velocity of the fluid entering the at least one inlet (13), and a catalyst composition coated on the substrate.