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HomeMaterials Science ForumMaterials Science Forum Vol. 913Different Precipitant Preparation of Nickel-Doped...

Different Precipitant Preparation of Nickel-Doped Mn/TiO₂ Catalysts for Low-Temperature SCR of NO with NH₃

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Abstract:

The Mn-Ni/TiO₂ catalyst was prepared by co-precipitation method and investigated for the low-temperature selective catalytic reduction (SCR) of NO with NH₃ in this work, and Mn-Ni/TiO₂catalysts were prepared by different precipitants respectively such as sodium hydroxide, carbamide, ammonia or hydrogen peroxide. The microstructure and performance of catalysts were investigated. The activitiesof catalysts prepared by different precipitants were studied in the temperature range 90°C-350°C. The results show that Mn-Ni/TiO₂catalyst prepared by CO(NH₂)₂-NH₃·H₂O-H₂O₂ compound precipitant has an extraordinary performance even at the low temperature of 120°C. H₂-TPR results show the peak positions shift to lower temperatures, standing for the reduction potential of MnO_x species is increased compared to those of Mn/TiO₂ catalysts. The interaction of Ni and Mn atoms is beneficial to an enhancement of the oxygen mobility due to CO(NH₂)₂-NH₃·H₂O-H₂O₂ as precipitant. It is worth noting that the low temperature peak area increased by adding hydrogen peroxide as precipitant. NH₃-TPD results illustrat that for the Mn/TiO₂ and Mn-Ni/TiO₂ catalysts which are attributed to NH₃ desorbed by weak acid sites and Brønsted acid sites.

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Materials Science Forum (Volume 913)

Pages:

976-984

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.913.976

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Online since:

February 2018

Authors:

Jianfeng Wang*, Guo Lan Tian, Su Ping Cui, Ya Li Wang

Keywords:

Brønsted Acid Sites, Low-Temperature SCR, Mn/TiO₂ Catalyst, Nickel-Doped

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© 2018 Trans Tech Publications Ltd. All Rights Reserved

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