Deterioration Mode of Barium-Containing NOx Storage Catalyst
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Barium-containing NO x storage catalyst showed serious deactivation under thermal exposure at high temperatures. To elucidate the thermal deterioration of the NO x storage catalyst, four types of model catalyst, Pt/Al2O3, Ba/Al2O3, Pt–Ba/Al2O3, and a physical mixture of Pt/Al2O3 + Ba/Al2O3 were prepared and their physicochemical properties such as BET, NO TPD, TGA/DSC, XRD, and XPS were evaluated while the thermal aging temperature was increased from 550 to 1050°C. The fresh Pt–Ba/Al2O3 showed a sorption capacity of 3.35 wt%/g-cat. but the aged one revealed a reduced capacity of 2.28 wt%/g-cat. corresponding to 68% of the fresh one. It was found that this reduced sorption capacity was directly related to the deterioration of the NO x storage catalyst by thermal aging. The Ba on Ba/Al2O3 and Pt–Ba/Al2O3 catalysts began to interact with alumina to form Ba–Al solid alloy above 600°C and then transformed into stable BaAl2O4 having a spinel structure. However, no phase transition was observed in the Pt/Al2O3 catalyst having no barium component, even after aging at 1050°C.
- M.S. Brogan, A.D. Clark and R.J. Brisley, SAE 980933 (1998).
- N. Takahashi, H. Shinjoh, T. Iijima, T. Suzuki, K. Yamazaki, N. Miyoshi, S.-i. Matsumoto, T. Tanizawa, T. Tanaka, S.-s. Tateishi and K. Kasahara, Catal. Today 27 (1996) 63.
- E. Fridell, M. Skoglundh, B. Westerberg, S. Johansson and G. Smeller, J. Catal. 183 (1999) 196.
- T. Kobayashi, T. Yamada and K. Kayano, SAE 970745 (1997).
- W. Bogner, M. Kramer, B. Krutzsch, S. Pischinger, D. Voigtlander, G. Wenninger, F. Wirbeleit, M.S. Brogan, R.J. Brisley and D.E. Webster, Appl. Catal. B 7 (1995) 153.
- S. Balcon, C. Potvin, L. Salin, J.F. Tempere and G. Djéga-Mariadassou, Catal. Lett. 60 (1999) 39.
- T. Nakatsuji and R. Yasukwa, SAE 980932 (1998).
- H. Mahzoul, J.F. Brilhac and P. Gilot, Appl. Catal. B 20 (1999) 47.
- N. Fekete, R. Kemmler, D. Voigtlander, B. Krutzsch, E. Zimmer, G. Wenninger,W. Strehlau, J.A.A. van den Tillaart, J. Leyrer, E.S. Lox and W. Muller,SAE 970746 (1997).
- J.M. Thomas and W.J. Thomas, Principles and Practice of Heterogeneous Catalysis (VCH, Weinheim, 1997) p. 151.
- T. Swanson, Natl. Bur. Stand. Circ. 539 (1953) 31; (b) L. Liu, J. Appl. Phys. 42 (1971) 3702; (c) S.-Y. Huang, R. von der Muehll, J. Ravez and M. Couzi, Ferroelectrics 159 (1994) 127.
- S. Hodjati, P. Bernhardt, C. Petit, V. Pitchon and A. Kiennemann, Appl. Catal. B 19 (1998) 209, 221.
- C.D. Wagner, W.M. Riggs, L.E. Davis and J.F. Moulder, A Reference Book of Standard Data: For Use in X-ray Photoelectron Spectroscopy (Perkin-Elmer, Eden Prairie, MN).
- Deterioration Mode of Barium-Containing NOx Storage Catalyst
Volume 77, Issue 1-3 , pp 21-28
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- Kluwer Academic Publishers-Plenum Publishers
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- NO x storage catalyst
- deactivation mode
- Industry Sectors
- Author Affiliations
- 1. School of Chemical Engineering, Ajou University, San 5, Wonchon, Suwon, Kyungki, Korea
- 2. Heesung Engelhard Co., R&D Center, 16B-12, 455, Moknae, Ansan, Kyungki, Korea
- 3. Korea Research Institute of Chemical Technology, Yusong, Taejon, 305-600, Korea