Home
Important Dates
Workshops
Program
Registration
Abstract Submission
List of Abstracts
List of Participants
SSRLUOEC Nominations
Lytle Award
Spicer Award
Exhibitors
Committees
Accommodations
Meeting Map
Travel
Visa Information
Tourism |
Abstract Details
In-situ Characterization of Isolated Vanadate Species on MCM-48
| Speaker | Jason Bronkema (UC Berkeley) |
| Full Author List | J.L. Bronkema (1,2), A.T. Bell (1,2), (none) (0), (none) (0), (none) (0), (none) (0), (none) (0), (none) (0), (none) (0), (none) (0) |
| Affiliations | 1. Department of Chemical Engineering, University of California, Berkeley, CA, USA,
2. Lawrence Berkeley National Laboratory, Berkeley, CA, USA,
3. (none),
4. (none),
5. (none),
6. (none),
7. (none),
8. (none),
9. (none),
10. (none) |
| Category | Materials Science |
| Abstract |
The determination of structure-function relationships in catalysts is greatly facilitated by the use of single-site catalysts for which the local composition and structure of the active sites are essentially identical. In this study, isolated vanadate species were deposited onto high surface area mesoporous silica known as MCM-48 by gas phase sublimation. Samples were prepared with vanadium surface densities of 0.1-0.75 V/nm2. In-situ XAS studies were performed to determine the local structure around the vanadate centers. The oxidation state of vanadium was established by XANES to be +5. EXAFS analysis confirmed the structure to be distorted tetrahedral with approximately 4 oxygen neighbors in the first shell and confirmed the absence of any V-V scattering.
|
|
SLAC /
SSRL