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Characteristics of NOx Reduction on NSR(NOx Storage and Reduction) Catalyst Supported by Ni, Ru-ZSM-5 Additives  

Choi, Byung-Chul (School of Mechanical System Engineering, Chonnam National University)
Lee, Choon-Hee (NGVI)
Jeong, Jong-Woo (School of Mechanical System Engineering, Chonnam National University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.15, no.5, 2007 , pp. 105-111 More about this Journal
Abstract
In this study, we investigated the conversion performance of de-NOx catalyst for lean-burn natural gas engine. As a de-NOx catalyst, NOx storage reduction catalyst was composed of Pt, Pd and Rh with washcoat including Ba and Ni, Ru-ZSM-5. Ni, Ru-ZSM-5, which was regarded as a NOx direct decomposition catalyst, was made up of ion exchanged ZSM-5 by 5wt.% Ni or Ru. The performance of de-NOx catalyst was evaluated by NOx storage capacity and catalytic reduction in air/fuel, $\lambda=1.6$. The catalytic reaction was also observed when the added fuel was supplied to fuel rich atmosphere by fuel spike period of 5 seconds. The NOx conversion of the catalysts with Ni-ZSM-5 or Ru-ZSM-5 was mainly caused by the effect of NOx adsorption of Ba rather than the catalytic reduction of Ni, Ru-ZSM-5. Ni, Ru-ZSM-5 catalysts can not use for the NSR catalyst because they have quick process in thermal deactivation.
Keywords
Catalyst; Natural gas vehicle; Lean-burn; NOx storage and reduction catalyst; Ba; ZSM-5; Ion exchange;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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