The Ce modified In/W–ZrO2 catalysts were prepared by impregnation and mechanical mix method. Their activities for SCR of NO x with methane were investigated. The activity of the In/W–ZrO2 catalyst was enhanced by addition of Ce with both methods, while the promotional effect was more pronounced for catalyst prepared by mechanical mix method compared to impregnation method. The function of Ce was to improve the oxidation of NO to NO2. The maximum NO x conversion over the mechanical mixed catalyst can be stabilized at 74% at 450 °C in a dry gas flow and 37% at 500 °C in wet flow (24,000 h−1). For the impregnated catalysts, Ce was found to compete with In to adsorb on strong acid site over W–ZrO2 support and inhibited the formation of InO+, which resulted in the lower activity of these catalysts than mechanical mixed catalysts.
Similar content being viewed by others
References
Li Y., Armor J.N. (1992) Appl. Catal. B 1:L31
Armor J.N. (1995) Catal. Today 26:147
Zhou X.J., Zhang T., Xu Z.S., Lin L.W. (1996) Catal. Lett. 40:35
Zhou X.J., Xu Z.S., Zhang T., Lin L.W. (1997) J. Mol. Catal. A 122:125
Suprun W., Schaedlich K., Papp H. (2005) Chem. Eng. Technol. 28:199
D. Yang, J.H. Li, M.F. Wen and C.L. Song, Catal. Commun. (submitted for publication).
Chin Y.H., Alvarez W.E., Resasco D.E. (2000) Catal. Today 62:291
Chin Y.H., Alvarez W.E., Resasco D.E. (2000) Catal. Today 62:159
Sowade T., Liese T., Schmidt C., Schutze F.W., Yu X., Berndt H., Grunert W. (2004) J. Catal. 225:105
Kubacka A., Janas J.,Sulikowski B. (2006) Appl. Catal. B 69:43
Noronha F.B., Fendley E.C., Soares R.R., Alvarez W.E., Resasco D.E. (2001) Chem. Eng. J. 82:21
He H., Dai H., Au C.T. (2004) Catal. Today 90:245
Campa M.C., DeRossi S., Ferraris G., Indovina V. (1996) Appl. Catal. B 8:315
Aylor A.W., Lobree L.J., Reimer J.A., A.T. Bell (1997) J. Catal. 170:390
Maunula T., Ahola J., Hamada H. (2006) Appl. Catal. B 64:13
Li J.H., Hao J.M., Cui X.Y., Fu L.X. (2005) Catal. Lett. 103:75
Liotta L.F., Di Carlo G., Pantaleo G., Deganello G. (2005) Catal. Comm. 6:329
Li N., Wang A.Q., Wang X.D., Zheng M.Y., Cheng R.H., Zhang T. (2004) . Appl. Catal. B 48:259
Li N., Wang A.Q., Tang J.W., Wang X.D., Liang D.B., Zhang T. (2003) Appl. Catal. B 43:195
Acknowledgments
This work was financially supported by the National Natural Science foundation of China (Grant NO. 20677034 and 20437010), and the National High-Tech Research and Development (863) Program of China (Grant No. 2006AA060301).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Yang, D., Li, J., Wen, M. et al. Promotional effect of Ce on the activity of In/W–ZrO2 for selective reduction of NO x with methane. Catal Lett 117, 68–72 (2007). https://doi.org/10.1007/s10562-007-9107-8
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10562-007-9107-8