Optimizing feed modulation for coupled methane and NOx conversion over Pd-Pt/Mn0.5Fe2.5O4/Al2O3 monolith catalyst
Karinshak, Kyle 1Chen, Pak Wing 1Liu, Ru-Fen 2Golden, Stephen J. 2Harold, Michael P.1
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作者信息
1. Univ Houston
2. CDTi Adv Mat Inc
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Abstract
The impacts of feed modulation (frequency, amplitude) and catalyst design (composition and architecture) parameters are reported for the conversion of methane and NOx over a dual-layer Pt+Pd/Al2O3 + Mn0.5Fe2.5O4/Al2O3 monolith. CH4 and NOx conversion data show that the dual-layer catalyst outperforms single-layer samples having the same catalyst loadings, with and without spinel. Close proximity of the PGM and MFO functions in the mixed-layer catalyst lowers the CH4 conversion at high temperature while separating the PGM and spinel layers with an intermediate Al2O3 layer does not. Methane conversion enhancement is linked to its nonmonotonic dependence on O-2. The performance gains are tied to a transient activity spike that occurs during the lean-to-rich feed transition when water is present in the feed. The transient spike is attributed to the removal of CO and H-2 products via reactions with stored O-2 in the spinel, eliminating inhibition of methane steam reforming.
NSTL
Elsevier