Nanocrystalline cerium oxide produced by supercritical antisolvent precipitation as a support for high-activity gold catalysts
Saved in:
| Title: | Nanocrystalline cerium oxide produced by supercritical antisolvent precipitation as a support for high-activity gold catalysts |
|---|---|
| Authors: | Tang, Zi-Rong1, Edwards, Jennifer K.1, Bartley, Jonathan K.1, Taylor, Stuart H.1, Carley, Albert F.1, Herzing, Andrew A.2, Kiely, Christopher J.2, Hutchings, Graham J.1 hutch@cf.ac.uk |
| Source: | Journal of Catalysis. Jul2007, Vol. 249 Issue 2, p208-219. 12p. |
| Subjects: | Nanocrystals, Cerium oxides, Oxidation, Carbon dioxide |
| Abstract: | Abstract: Nanocrystalline CeO2 was prepared by precipitation of a solution of the acetate using supercritical CO2 as an antisolvent. It was demonstrated that gold supported on this material is very active for the oxidation of CO at ambient temperature, particularly in comparison with CeO2 prepared in a conventional manner by thermal decomposition of the acetate. Comparing the catalytic performance for CO oxidation with the most active catalysts in the current literature confirms the high activity of these new materials. They are considerably more active than previous Au/CeO2 catalysts. The catalyst activity was found to be dependent on the precipitation conditions, which in turn was found to influence the dispersion of gold on the support, as evidenced by detailed microscopy and spectroscopy characterization. The most active fresh catalyst exhibited highly dispersed gold and showed no evidence of the existence of Au nanocrystals using detailed STEM analysis. Following reaction with CO/O2, subtle microstructural changes were apparent, although the morphology of the nanocrystalline CeO2 support was unchanged; in particular, the Au, which was previously uniformly dispersed, showed signs of beginning to agglomerate into sub-5 nm particles. The stability and origin of the catalytic activity are discussed. [Copyright &y& Elsevier] |
| Copyright of Journal of Catalysis is the property of Academic Press Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
Be the first to leave a comment!
