One method to remove NOx from diesel exhaust is adding urea (CO(NH2)2) and running the exhaust through a selective catalytic reduction (SCR) unit. If the uncontrolled emission factor is 13 gN Ox bhp·hr and the engine needs to meet a regulatory standard of 0.2 gN Ox bhp·hr , how much urea is needed (in units of g/hp-hr)? Given: CO(NH2)2 + 2 NO + 1 2 O2 −−→ 2 N2 + CO2 + 2 H2O P 2 of 3

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