Effect of water vapor on the activity and stability of Pd/SZ and Co/ZrO sub(2) in dual-catalyst treatment of simulated exhaust from lean-burn natural gas engines

Effect of water vapor on the activity and stability of Pd/SZ and Co/ZrO sub(2) in dual-catalyst treatment of simulated exhaust from lean-burn natural gas engines

A dual-catalyst system, consisting of an NO oxidation catalyst component (Co/ZrO sub(2)) and a NOx reduction catalyst component (Pd/SZ) was investigated for selective catalytic reduction of NOx under lean conditions. The integrated catalyst system is capable of performing three-distinct catalytic fu...

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Veröffentlicht in:Applied catalysis. B, Environmental Environmental, 2010-06, Vol.96 (3-4), p.421-433
Hauptverfasser: Mirkelamoglu, Burcu, Ozkan, Umit S
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Ozkan, Umit S
description A dual-catalyst system, consisting of an NO oxidation catalyst component (Co/ZrO sub(2)) and a NOx reduction catalyst component (Pd/SZ) was investigated for selective catalytic reduction of NOx under lean conditions. The integrated catalyst system is capable of performing three-distinct catalytic functions, namely, NOx reduction, combustion of unburned hydrocarbons and oxidation of carbon monoxide. The hydrothermal stability of the dual-catalyst system was investigated through steady-state and time-on-stream measurements. Water vapor was found to inhibit the NOx reduction activity of Pd/SZ, whereas it had no effect on NO oxidation over Co/ZrO sub(2). The dual-catalyst system was capable of retaining stable catalytic activity during simulated lean exhaust treatment in the presence of 7% H sub(2)O.
doi_str_mv 10.1016/j.apcatb.2010.02.040
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title Effect of water vapor on the activity and stability of Pd/SZ and Co/ZrO sub(2) in dual-catalyst treatment of simulated exhaust from lean-burn natural gas engines
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