Influence of the catalyst surface area on the activity and stability of
Au/CeO2 catalysts for the low-temperature water gas shift reaction |
| |
| Authors: | A Karpenko R Leppelt V Plzak J Cai A Chuvilin B Schumacher U Kaiser R J Behm |
| |
| Affiliation: | (1) Institute of Surface Chemistry and Catalysis, Ulm University, Ulm, D-89069, Germany;(2) Center of Solar Energy and Hydrogen Research, Helmholtzstr. 8, Ulm, D-89081, Germany;(3) Center of Electron Microscopy, Ulm University, D-89069 Ulm, Germany |
| |
| Abstract: | The influence of the support surface area on the activity and stability/deactivation of Au/CeO2 catalysts (2.7 wt% Au) in the water gas shift reaction in dilute water gas were investigated by kinetic measurements and
in situ Diffuse Reflectance IR spectroscopy. For ceria support surface areas between 24 and 284 m2 g−1, the gold particle size is independent on the catalyst surface area (about 2.1 nm) up to 188 m2 g−1, and we found increased amounts of (i) Aun+, (ii) Ce3+, (iii) OH groups, and (iv) carbon containing adsorbed side products such as formates and carbonates for increasing surface
area supports. Consequences of these results on the mechanistic understanding of the reaction are discussed. |
| |
| Keywords: | water gas shift reaction Au catalyst surface area deactivation Au/CeO2 GC DRIFTS XPS TEM XRD |
| 本文献已被 SpringerLink 等数据库收录！ |
|
