Abstract
In a recent review article, it was suggested that a redox mechanism best describes observations regarding the WGS reaction for metal promoted ceria systems, as well as how molecules such as CO, CO2, H2O, and H2 interact with the ceria surface. In this contribution, the pretreated surface of Pt/ceria was subjected to steaming or H2 treatment at 250 °C followed by CO adsorption after six different pre-treatment sequences were performed. Subjecting a H2-treated surface directly to CO, or followed by steaming, led to the highest concentration of surface formates by reaction of CO with Ce3+ defect-associated Type II bridging OH groups. The Type II OH groups were also generated by CO treatment followed by steaming. Using CO as a probe led to a significant coverage of formate species, though less than the previous cases (CO added to a H2 treated surface or a surface treated with H2, then H2O). Surprisingly, even subjecting an oxidized surface (pre-reduced and subjected to O2 at 400 °C) to steam still produced a significant density of Type II OH groups, as evidenced by the formates produced upon exposure to CO. The formates were easily decomposed in steam at 130 °C and converted to carbonate species. Thus, focusing on the turnover of formate via C–H bond breaking offers important possibilities for future catalyst development.
Graphical Abstract
Similar content being viewed by others
References
Gorte RJ, Zhao S (2005) Catal Today 104:18
Shido T, Iwasawa Y (1993) J Catal 141:71
Jacobs G, Patterson PM, Graham UM, Sparks DE, Davis BH (2004) Appl Catal A 269:63
Laachir A, Perrichon V, Badri A, Lamotte J, Catherine E, Lavalley JC, El Fallah J, Hilaire L, Le Normand F, Quemere E, Sauvion GN, Touret O (1983) J Chem Soc, Faraday Trans 79:2219
Binet C, Daturi M, Lavalley JC (1999) Catal Today 50:207
Jacobs G, Graham UM, Chenu E, Patterson PM, Dozier A, Davis BH (2005) J Catal 229:499
Jacobs G, Patterson PM, Williams L, Chenu E, Sparks D, Thomas G, Davis BH (2004) Appl Catal A 262:177
Jacobs G, Patterson PM, Williams L, Sparks D, Davis BH (2004) Catal Lett 96:97
Li Y, Fu Q, Flytzani-Stephanopoulos M (2000) Appl Catal B 27:179
Jacobs G, Ricote S, Patterson PM, Graham UM, Dozier A, Khalid S, Rhodus E, Davis BH (2005) Appl Catal A 292:229
Jacobs G, Ricote S, Graham UM, Patterson PM, Davis BH (2005) Catal Today 106:259
Padeste C, Cant NW, Trimm DL (1993) Catal Lett 18:305
Hilaire S, Wang X, Luo T, Gorte RJ, Wagner J (2001) Appl Catal 215:271
J. Vecchietti, A. Bonivardi, W. Xu, D. Stacchiola, J.J. Delgado, M. Calatayud, S. E. Collins (2014) ACS Catal 4:2088
Holmgren A, Andersson B, Duprez D (1999) Appl Catal B 22:215
Li C, Sakata Y, Arai T, Domen K, Maruya K, Onishi T (1989) J Chem Soc, Faraday Trans 1(85):929
Meunier FC, Tibiletti D, Goguet A, Reid D, Burch R (2005) Appl Catal A 289:104
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Jacobs, G., Ricote, S., Graham, U.M. et al. Low Temperature Water–Gas Shift Reaction: Interactions of Steam and CO with Ceria Treated with Different Oxidizing and Reducing Environments. Catal Lett 145, 533–540 (2015). https://doi.org/10.1007/s10562-014-1440-0
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10562-014-1440-0