Browse > Article

REDUCTION CHARACTERISTICS OF NOx STORAGE CATALYST FOR LEAN-BURN NATURAL GAS VEHICLES  

Lee, C.H. (NGVI Co.)
Choi, B.C. (School of Mechanical Systems Engineering, Chonnam National University)
Publication Information
International Journal of Automotive Technology / v.8, no.6, 2007 , pp. 667-674 More about this Journal
Abstract
Various types of NOx storage catalysts for NGV's were designed, manufactured, and tested in this work on a model gas test bench. As in most of other studies on NOx storage catalyst, alkaline earth metal barium(Ba) was used as the NOx adsorbing substance. The barium-based experimental catalysts were designed to contain different amounts of Ba and precious metals at various ratios. Reaction tests were performed to investigate the NOx storage capacity and the NOx conversion efficiency of the experimental catalysts. From the results, it was found that when Ba loading of a catalyst was increased, the quantity of NOx stored in the catalyst increased in the high temperature range over 350. With more Ba deposition, the NOx conversion efficiency as well as its peak value increased in the high temperature range, but decreased in the low temperature range. The best of de-NOx catalyst tested in this study was catalyst B, which was loaded with 42.8 g/L of Ba in addition to Pt, Pd and Rh in the ratio of 7:7:1. In the low temperature range under $450^{\circ}C$, the NOx conversion efficiencies of the catalysts were lower when $CH_4$, instead of either $C_3H_6$ or $C_3H_8$, was used as the reductant.
Keywords
NOx storage catalyst; Natural gas; $CH_4$; Double layer washcoat; Adsorption; Desorption;
Citations & Related Records

Times Cited By Web Of Science : 3  (Related Records In Web of Science)
연도 인용수 순위
  • Reference
1 Fridell, E., Persson, H., Westerberg, B., Johansson, S. and Smedler, G. (1999). NOx storage in barium-containing catalysts. J. Catalysis, 183, 196−209
2 Miyoshi, N., Matsumoto, S. and Katoh, K. (1995). Development of new concept three-way catalyst for automotive lean-burn engines. SAE Paper No. 950809
3 Matsumoto, S., Ikeda, Y., Suzuki, H., Ogai, M. and Miyoshi, N. (2000). NOx storage-reduction catalyst for automotive exhaust with improved tolerance against sulfur poisoning. Applied Catalysis B: Environmental, 25, 115−124
4 Ohtsuka, H. and Tabata, T. (2001). Roles of palladium and platinum in the selective catalytic reduction of nitrogen oxides by methane on palladium-platinumloaded sulfated zirconia. Applied Catalysis B: Environmental 29, 3, 177−183
5 Sadovskaya, E. M., Suknev, A. P., Pinaeva, L. G., Goncharov, V. B., Bal'zhinimaev, B. S., Chupin, C., Perez-Ramírez, J. and Mirodatos, C. (2004). Mechanism and Kinetics of the selective NO reduction over Co-ZSM-5 studied by the SSITKA technique: 2. reactivity of $NO_x-adsorbed$ species with methane. J. Catalysis 225, 1, 179−189
6 Brogan, M. S., Brisley, R. J. A., Walker, P., Webster, D. E., Boegner, W., Fekete, N. P., Kramer, M., Krutzsch, B. and Voigtlander, D. (1995). Evaluation of NOx storage catalysts as an effective system for NOx removal from the exhaust gas of leanburn gasoline engine. SAE Paper No. 952490
7 Holmgreen, E. M., Yung, M. M. and Ozkan, U. S. (2007). Dual-catalyst aftertreatment of lean-burn natural gas engine exhaust. Applied Catalysis B: Environmental, 74, 73−82
8 Ryan, R. (2006). Surface and Nanomolecular Catalysis. Taylor & Francis. New York. 7−11
9 Ohtsuka, H., Tabata, T. and Hirano, T. (2000). Palladiumplatinum-loaded sulfated zirconia: A highly durable catalyst for the reduction of nitrogen oxides by methane in the presence of water vapor and $SO_x$, Applied Catalysis B: Environmental 28, 2, L73−L76
10 Centi, G. and Perathoner, S. (1996). Role and importance of oxidized nitrogen oxide adspecies on the mechanism and dynamics of reaction over copper-based catalysts. Catalysis Today, 29, 117−122
11 Lee, C. H., Choi, B. C. and Juhng, W. N. (2004). Comparison of NOx reduction characteristics of NOx storage catalyst with TWC for lean-burn natural gas vehicles. Trans. Korean Society of Automotive Engineers 12, 5, 79−84
12 Kaspar, J., Fornasier, P. and Hickey, N. (2003). Automotive catalytic converter: Current status and some perspective. Catalysis Today, 77, 419−449
13 Theis, J. R., Ura, J. A. and Graham, G. W. (2004). The effects of aging temperature and air-fuel ratio on the NOx storage capacity of a lean NOx trap. SAE Paper No. 2004-01-1493
14 Lee, C. H. and Choi, B. C. (2005). Evaluation of NOx reduction catalyst by model gas for lean-burn natural gas engine. Int. J. Automotive Technology 6, 6, 591−598
15 Jun, H. J. and Shu, G. (2002). An Introduction to Catalyst. Hanlimwon. Seoul. Korea. 15−54
16 Kim, Y. K. and Choi, B. C. (2001). Alternative Energy Engine. Baro Press Co.. Gwangju. Korea. 6−58
17 Rohr, F., Peter, S. D., Lox, E., Kogel, M., Sassi, A., Juste, L., Rigaudeau, C., Belot, G., Gélin, P. and Primet, M. (2005). On the mechanism of sulphur poisoning and regeneration of a commercial gasoline $NO_x-storage$ catalyst. Applied Catalysis B: Environmental, 56, 201−212
18 Takahashi, N., Shinjoh, H., Iijima, T., Suzuki, T., Yamazaki, K., Yokota, K., Suzuki, H., Miyoshi, N., Matsumoto, S., Tanizawa, T., Tanaka, T., Tateishi, S. and Kasahara, K. (1996). The new concept 3-way catalyst for automotive lean-burn engine: NOx storage and reduction catalyst. Catalysis Today, 27, 63−69
19 Matsumoto, S. (2004). Recent advances in automobile exhaust catalysts. Catalysis Today, 90, 183−190
20 Choi, B. C., Jeong, J., Son, G. and Jung, M. (2005). Conversion characteristics of double-layer washcoat tri-metal TWC using high cell density substrate. JSME Int. J. B. 48, 4, 874−881