(691e) CH4 Steam Reforming on Pt+Pd/Al2O3 Monolith Catalyst: Impact of Mn0.5Fe2.5O4 Spinel Addition
- Conference: AIChE Annual Meeting
- Year: 2021
- Proceeding: 2021 Annual Meeting
- Group: Catalysis and Reaction Engineering Division
- Time: Tuesday, November 16, 2021 - 9:12am-9:30am
Dual-layer PGM+spinel (30/100/25) and PGM-only (30/100a) monolith catalysts [30 g PGM/ft3 monolith, 100 g spinel (25% on Al2O3)/L or 100 g Al2O3/L monolith] were provided by CDTi Inc. Flow experiment results with lean/rich feed reveal O2 depletion at temperature above 350ºC, suggesting that MSR becomes the primary pathway for the remaining ~20% CH4 conversion (Figure 1). Figure 2 shows full CH4 conversion by 475ºC in the MSR reaction over PGM-only catalyst. However, MSR activity is inhibited by spinel addition. Enrichment of Mn and Fe species was observed near the surface PGM layer of the PGM+spinel catalyst from SEM-EDS analyses (Figure 3) and DRIFTS data, indicating possible metal migration and encapsulation of the PGM active sites. DFT calculated results also indicate favorable metal and/metal oxide layer formation on the PGM layer.
Our study provides fundamental and practical insight into the CH4 abatement in rich conditions at high temperatures, which paves the path for optimizing catalyst formulation and operation of NGV emission control.
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