Accelerated deactivation studies of the natural-gas oxidation catalyst-Verifying the role of sulfur and elevated temperature in catalyst aging
- Honkanen, Mari
- Kärkkäinen, Marja
- Kolli, Tanja
- Heikkinen, Olli
- Viitanen, Ville
- Zeng, Lunjie
- Jiang, Hua
- Kallinen, Kauko
- Huuhtanen, Mika
- Keiski, Riitta L.
- Lahtinen, Jouko
- Olsson, Eva
- Vippola, Minnamari
DOIAbstract
Accelerated deactivation, caused by thermal aging (TA) and/or sulfur+water poisoning (SW), of the PtPd/γ-Al2O3 natural-gas oxidation catalyst was studied. Thermal aging and poisoning treatments were performed separately and with varied combinations and comprehensive characterization of the catalyst was carried out after each step. The fresh catalyst has small, oxidized PtPd particles (<5nm) uniformly distributed in the γ-alumina washcoat. After the SW-treatment, a small amount of bulk aluminum sulfate was observed near the slightly grown noble metal particles. During the thermal aging, γ-alumina changed to δ-/θ- and α-alumina. In addition, total decomposition of oxidized Pt and partly decomposition of oxidized Pd occurred resulting in the f...
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