Abstract
The effect of sulfur on the water-gas-shift (WGS) activity of Pd/ceria catalysts has been studied using steady-state rate measurements, pulse-reactor studies, and FTIR. After exposing Pd/ceria to SO2 at 673 K in an oxidizing environment, the WGS rates dropped to a value close to that observed on Pd/alumina. Both pulse-reactor and FTIR measurements showed that cerium sulfates can be readily reduced by CO and re-oxidized by O2 at 723 K; however, unlike reduced ceria, the Ce2O2S formed by reduction of the sulfates cannot be re-oxidized by H2O or CO2. The implications of these measurements for understanding the oxygen-storage capacity (OSC) of three-way catalysts are discussed.
Similar content being viewed by others
References
H. C. Yao and Y. F. Y. Yao, J. Catal. 86 (1984) 254.
J. G. Nunan, W. B. Williamson and H. J. Robota, SAE paper 960798 (1996).
M. H. Yao, R. J. Braird, F. W. Kunz and T. E. Hoost, J. Catal. 166 (1997) 67.
T. Bunluesin, R. J. Gorte and G. W. Graham, Appl. Catal. B14 (1997) 105.
D. D. Beck, J. W. Sommers and C. L. Dimaggio, Appl. Catal. B3 (1994) 205.
D. D. Beck, J. W. Sommers and C. L. DiMaggio, Appl. Catal. B11 (1997) 273.
D. D. Beck and J. W. Sommers, Appl. Catal. B6 (1994) 185.
D. D. Beck, Catal. Deactivation 111 (1997) 21.
J. S. Hepburn, N. R. Collins, C. L. DiMaggio and J. W. Sommers, SAE paper 952416 (1995).
S. Hilaire, S. Sharma, R. J. Gorte, J. M. Vohs and H.-W. Jen, Catal. Lett. 70 (2000) 131.
M. Waqif, P. Bazin, O. Saur, J. C. Lavalley, G. Blanchard and O. Touret, Appl. Catal. B11 (1997) 193.
P. Bazin, O. Saur, J. C. Lavalley, G. Blanchard, V. Visciglio and O. Touret, Appl. Catal. B13 (1997) 265.
P. Bazin, O. Saur, J. C. Lavalley, A. M. Le Govic and G. Blanchard, Stud. Surf. Sci. Catal. 116 (1998) 571.
M. Waqif, A. Pieplu, O. Saur, J. C. Lavalley and G. Blanchard, Solid State Ionics 95 (1997) 163.
J. A. Rodriguez, T. Jirsak, A. Freitag, J. C. Hanson, J. Z. Larese and S. Chaturvedi, Catal. Lett. 62 (1999) 113.
R. Ferrizz, R. J. Gorte and J. M. Vohs, Catal. Lett. (in press).
S. H. Overbury, D. R. Mullins, D. R. Huntley and L. Kundakovic, J. Phys. Chem. B103 (1999) 11308.
T. Luo, J. M. Vohs and R. J. Gorte, J. Catal. 210 (2002) 397.
T. Bunluesin, R. J. Gorte and G. W. Graham, Appl. Catal. B15 (1998) 107.
S. Hilaire, X. Wang, T. Luo, R. J. Gorte and J. Wagner, Appl. Catal. A215 (2001) 271.
X. Wang and R. J. Gorte, Catal. Lett. 73 (2001) 15.
S. Sharma, S. Hilaire, J. M. Vohs, R. J. Gorte and H.-W. Jen, J. Catal. 190 (2000) 199.
X. Wang, R. J. Gorte and J. Wagner, J. Catal. 212 (2002) 225.
L. Yang, O. Kresnawahjuesa and R. J. Gorte, Catal. Lett. 72 (2001) 33.
R. K. Dwivedi and D. A. R. Kay, Metall. Trans. B15B (1984) 523.
D. A. R. Kay, W. G. Wilson and V. J. Jalan, J. Alloys Comp. 192 (1993) 11.
H. Cordatos, T. Bunluesin, J. Stubenrauch, J. M. Vohs and R. J. Gorte, J. Phys. Chem. 100 (1996) 785.
T. Wang, R. E. Soltis, E. M. Logothetis, J. A. Cook and D. R. Hamburg, SAE paper 930352 (1993).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Luo, T., Gorte, R. A Mechanistic Study of Sulfur Poisoning of the Water-Gas-Shift Reaction over Pd/Ceria. Catalysis Letters 85, 139–146 (2003). https://doi.org/10.1023/A:1022125209602
Issue Date:
DOI: https://doi.org/10.1023/A:1022125209602