Abstract
Synchrotron-based techniques (high-resolution photoemission, in-situ X-ray absorption spectroscopy, and time-resolved X-ray diffraction) have been used to study the destruction of SO2 and the water-gas shift (WGS, CO + H2O → H2 + CO2) reaction on a series of gold/ceria systems. The adsorption and chemistry of SO2 was investigated on Au/CeO2(111) and AuOx/CeO2 surfaces. The heat of adsorption of the molecule on Au nanoparticles supported on stoichiometric CeO2(111) was 4-7 kcal/mol larger than on Au(111). However, there was negligible dissociation of SO2 on the Au/CeO2(111) surfaces. The full decomposition of SO2 was observed only after introducing O vacancies in the ceria support. AuOx/CeO2 surfaces were found to be much less chemically active than Au/CeO2(111) or Au/CeO2-x(111) surfaces. In a separate set of experiments, in-situ time-resolved X-ray diffraction and X-ray absorption spectroscopy were used to monitor the behavior of nanostructured {Au + AuOx}-CeO2 catalysts under the WGS reaction. At temperatures above 250
Original language | English (US) |
---|---|
Pages (from-to) | 73-81 |
Number of pages | 9 |
Journal | Topics in Catalysis |
Volume | 44 |
Issue number | 1-2 |
DOIs | |
State | Published - Jun 2007 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Catalysis
- General Chemistry
Keywords
- CO oxidation
- Ceria
- DeSO
- Gold
- Gold oxide
- Hydrogen production
- Sulfur dioxide
- Water-gas shift