Abstract
The effects of adding iron to Pd–Pt/sulfated zirconia (SZ) on the selective NO x reduction by methane were examined based on durability tests under conditions simulating natural gas combustion exhaust. While Pd–Pt/SZ was severely deactivated at 500 °C, Pd–Pt/Fe-SZ maintained a NO x conversion higher than 70% for over 2400 h under the same conditions. Methane conversion on Pd–Pt/Fe-SZ was significantly lower than that on Pd–Pt/SZ. XRD analysis of fresh and used catalysts showed that a part of the SZ had transformed to monoclinic ZrO2 and that adding Fe suppressed the transformation. These results suggested that the improvement in NO x conversion by adding Fe was due to the suppression of methane combustion and the stabilization of SZ against transformation to ZrO2.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Y. Li and J. N. Armor, Appl. Catal. B1 (1992) L31.
Y. Li and J. N. Armor, Appl. Catal. B2 (1993) 239.
E. Kikuchi and K. Yogo, Catal. Today 22 (1994) 73.
Y. Li and J. N. Armor, J. Catal. 145 (1994) 1.
Y. Nishizaka and M. Misono, Chem. Lett. (1993) 1295.
Y. Nishizaka and M. Misono, Chem. Lett. (1994) 2237.
H. Uchida, K. Yamaseki and I. Takahashi, Catal. Today 29 (1996) 99.
J. N. Armor, Catal. Today 26 (1995) 147.
S. Satokawa, K. Yamaseki and H. Uchida, Proc. Meeting of the Japan Association of Zeolite 15 (1999) 104.
M. Suzuki, J. Amano and M. Niwa, Microporous Mesoporous Mater. 21 (1998) 541.
M. Ogura, Y. Sugiura, M. Hayashi and E. Kikuchi, Catal. Lett. 42 (1996) 185.
M. Ogura, S. Kage, M. Hayashi, H. Matsukata and E. Kikuchi, Appl. Catal. B27 (2000) L213.
H. Hamada, Y. Kintaichi, M. Tabata, M. Sasaki and T. Ito, Shokubai (Catalyst) 33 (1991) 59.
H. Hamada, Shokubai (Catalyst) 33 (1991) 320.
C. J. Loughran and D. E. Resasco, Appl. Catal. B7 (1995) 113.
Y.-H. Chin, W. E. Alvarez and D. E. Resasco, Catal. Today 62 (2000) 159.
J. K. Lampert, M. S. Kazi and R. J. Farrauto, Appl. Catal. B14 (1997) 211.
H. Ohtsuka, T. Tabata and T. Hirano, Appl. Catal. B28 (2000) L73.
M. Hino and K. Arata, Hyomen (Surface) 34 (1996) 51.
K. Arata, Appl. Catal. A146 (1996) 3.
M. Scheithauer, E. Bosch, U. A. Schubert, H. Knoezinger, T.-K. Cheung, F. C. Jentoft, B. C. Gates and B. Tesche, J. Catal. 177 (1998) 137.
T. Yamamoto, T. Tanaka, S. Takenaka, S. Yoshida, T. Onari, Y. Takahashi, T. Kosaka, S. Hasegawa and M. Kudo, J. Phys. Chem. B103 (1999) 2385.
M. Ogura, M. Hayashi and E. Kikuchi, Proc. 12th Int. Zeolite Conference, 5–10 July 1998, Baltimore, MD, p. 2833.
H. Ohtsuka and T. Tabata, Appl. Catal. B29 (2001) 177.
H. Toraya, M. Yoshimura and S. Somiya, J. Am. Ceram. Soc. 67 (1984) C-119.
E. Anastassakis, B. Papanicolaou and I. M. Asher, J. Phys. Chem. Solids 36 (1975) 667.
C. Carlone, Phys. Rev. B45 (1992) 2079.
G. Koyano, S. Yokoyama and M. Misono, Appl. Catal. A188 (1999) 301.
M. Ogura, M. Hayashi, S. Kage, M. Matsukata and E. Kikuchi, Appl. Catal. B23 (1999) 247.
B. J. Adelman and W. M. H. Sachtler, Appl. Catal. B14 (1997) 1.
M. Inaba, Y. Kintaichi, M. Haneda and H. Hamada, Nihon Kagaku Kaishi (2000) 467.
E. C. Subbarao, in: Advances in Ceramics, Vol. 3, eds. H. Heuer and L. W. Hobbs (American Ceramics Society, Columbus, OH, 1981) p. 1.
M. Lajavardi, D. J. Kenney and S. H. Lin, J. Chinese Chem. Soc. 47 (2000) 1065.
G. Stefanic, S. Music, S. Popovic and K. Nomura, J. Mol. Struct. 480–481 (1999) 627.
M. Hino and K. Arata, Hyomen (Surface) 28 (1990) 481.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Ohtsuka, H. Effect of Iron Addition on the Durability of Pd–Pt-Loaded Sulfated Zirconia for the Selective Reduction of Nitrogen Oxides by Methane. Catalysis Letters 87, 179–186 (2003). https://doi.org/10.1023/A:1023547307809
Issue Date:
DOI: https://doi.org/10.1023/A:1023547307809