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High-Temperature NO x Storage and Sulfur-Resistance of the Lithium-Based Lean-Burn NO x Trap Catalyst Pt/Li/TiO2–Al2O3

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Abstract

A series of lithium-based lean-burn NO x trap catalysts Pt/Li/TiO2–Al2O3 were prepared by sequential impregnation. The doping of TiO2 into the support Al2O3 significantly enhances the sulfur-resistance performance of the catalyst Pt/Li/Al2O3. On TiO2–Al2O3 mixed oxides, the Pt and lithium species are more highly dispersed, giving higher NO x storage capacity, as compared with those on Al2O3 and TiO2. In situ DRIFTS reveals that the NO x storage on Pt/Li/TiO2–Al2O3 mainly proceeds on –OLi sites forming bidentate nitrate species at 500 °C. The catalyst Pt/Li/TiO2–Al2O3 with 40% TiO2 in the support is the most promising one applicable to the lean-burn NO x abatement.

Graphical Abstract

The sulfated NSR catalyst Pt/Li/TA(40) is easier to reduce than the sulfated Pt/Ba/TA(40), showing better regeneration ability.

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Acknowledgements

This work is financially supported by the National Natural Science Foundation of China (No. 20876110), the Specialized Research Fund for the Doctoral Program of Higher Education of China (No. 20090032110013) and the Program of New Century Excellent Talents in University of China (No. NCET-07-0599). The authors are also grateful to the support from the Cheung Kong Scholar Program for Innovative Teams of the Ministry of Education (No. IRT0641).

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Correspondence to Ming Meng.

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He, JJ., Meng, M., Zou, ZQ. et al. High-Temperature NO x Storage and Sulfur-Resistance of the Lithium-Based Lean-Burn NO x Trap Catalyst Pt/Li/TiO2–Al2O3 . Catal Lett 136, 234–242 (2010). https://doi.org/10.1007/s10562-010-0314-3

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