Fuel reforming over Ni-based catalysts coupled with selective catalytic reduction of NOx

doi:10.1016/S1872-2067(12)60598-1

Abstract

Abstract: La₂O₂CO₃, CeO₂, ZrO₂, and Al₂O₃ supported Ni catalysts were prepared by an impregnation method and employed for reforming of n-dodecane to simultaneously produce low molecular weight hydrocarbons (HCs) and H₂. These reforming products served as reductants and promoters for the selective catalytic reduction (SCR) of NO_x over Ag/Al₂O₃. N₂ adsorption-desorption, X-Ray powder diffraction, H₂ temperature programmed reduction, and thermogravimetric analysis were performed for Ni-based catalysts. It was shown that an increase in the redox performance of Ni-based catalysts enhanced the H₂ production from fuel reforming but decreased the amount of HCs available for further SCR reaction. The temperature window for NO_x removal using the coupled system shifted to lower temperatures at the expense of the NO_x conversion. An optimal ratio of H₂/HCs was achieved using a Ni/ZrO₂+Ag/Al₂O₃dual catalyst system, which exhibited high activity for NO_x conversion at typical diesel exhaust temperatures. Studies on the durability and performance of this Ni/ZrO₂+Ag/Al₂O₃coupled system were also performed, and the results showed that the lifetime of the reforming catalyst may limit the system and requires further improvement.

Key words: Catalytic reforming, Ni-based catalyst, Nitrogen oxide, Selective catalytic reduction, Silver, Alumina

ZHAO Jiaojiao, YU Yunbo, HAN Xue, HE Hong. Fuel reforming over Ni-based catalysts coupled with selective catalytic reduction of NO_x[J]. Chinese Journal of Catalysis, DOI: 10.1016/S1872-2067(12)60598-1.

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Fuel reforming over Ni-based catalysts coupled with selective catalytic reduction of NO_x

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