Perovskite-Based Lean-Burn NOx Trap Catalysts Without Using Platinum Group Metals: K/LaCoO3/Ce1?xZrxO2 |
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| Authors: | Xiaoxia He Junjun He and Ming Meng |
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| Affiliation: | (1) Tianjin Key Laboratory of Catalysis Science and Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, People’s Republic of China;(2) State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, Kunming Sino-Platinum Metals Catalyst Co., LTD, Kunming, 650106, Yunnan, People’s Republic of China; |
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| Abstract: | Abstract A series of Ce1−x
Zr
x
O2 (x = 0, 0.1, 0.2, 0.3) solid solution supported lean-burn NO
x
trap (LNT) catalysts K/LaCoO3/Ce1−x
Zr
x
O2 were prepared by successive impregnation. After sulfation the supported perovsikte LaCoO3 was well maintained; reducing treatment partly destroyed the perovsikte, but it can be well recovered by re-oxidation treatment.
Based on NO
x
storage and sulfur-resisting performance of the catalysts, the optimal atomic ratio of Zr in Ce1−x
Zr
x
O2 support is x = 0.2. The catalyst K/LaCoO3/Ce0.8Zr0.2O2 exhibits much better NO
x
storage capacity than the Pt-based catalyst Pt/K/Ce0.8Zr0.2O2, which is highly related to its stronger capability for NO to NO2 oxidation. During NO
x
storage much larger amounts of nitrate and nitrite species were identified by in situ DRIFTS over perovskite-based catalysts
than over Pt-based one. The H2-TPR results reveal that after deep sulfation little sulfur species were deposited on the catalyst K/LaCoO3/Ce1−x
Zr
x
O2, showing strong sulfur-resisting ability. As a result, it is thought that the full replacement of Pt by perovskite LaCoO3 in the corresponding LNT catalysts is feasible. |
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