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- Title
New Insights into the Nature of Co-components and Their Impact on Pd Structure: X-ray Absorption Studies on Toluene Acetoxylation Catalysts.
- Authors
Gatla, Suresh; Radnik, Jörg; Madaan, Neetika; Pohl, Marga ‐ Martina; Mathon, Olivier; Rogalev, Andrei; Narayana Kalevaru, Venkata; Martin, Andreas; Pascarelli, Sakura; Brückner, Angelika
- Abstract
Co-components are a powerful tool to tune the performance of catalysts, but their nature and their impact on the catalysts is often controversially discussed. In this study X-ray absorption spectroscopy (XAS) was employed to elucidate the nature of co-components and their impact on the catalytic reaction. In anatase-supported Pd-based catalysts for the gas-phase acetoxylation of toluene, less noble co-components (e.g., Mn, Co, and Sb) spread over the support in their oxidic form and changed their valence state on stream. Incorporated atoms such as C or a small part of the Sb affect the electronic structure of Pd. For the noble Au, only a weak interaction with the support and Pd was observed during time on stream. Only XAS at the K-edges together with investigations of the Pd L-edge for a better understanding of the electronic structure, supplemented by STEM for elemental mapping, allow such detailed insights.
- Subjects
PALLADIUM catalysts; X-ray absorption; TOLUENE; GAS phase reactions; ELECTRONIC structure
- Publication
Chemistry - A European Journal, 2015, Vol 21, Issue 43, p15280
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201502162