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Metal wire gauzes as catalyst supports and structured reactor internals offer a number of advantages over monolithic reactors. Structured catalytic reactors based on wire gauzes are explored in this study for the control of NO_x emissions from a stationary engine fuelled with gas generated from a biomass gasification process. Simulations are performed on reactors filled with (a) wire gauzes, (b) multi-channel monoliths, and (c) a packed bed with 2mm beads, for the NH₃-SCR process using the kinetic data obtained for copper-exchanged ultra-stabilized zeolite Y catalyst (Cu-USY). The purpose of this procedure is to select the most efficient reactor internals and to assess the necessary reactor length allowing maximum conversion of NO_x. These simulations show that optimum performance is obtained when the wire gauze support is employed. The results also show that when the Cu-USY catalyst (very active in SCR) is …