Enhanced low-temperature NH3-SCR performance of CeTiOx catalyst via surface Mo modification

doi:10.1016/S1872-2067(19)63437-6

Abstract

Abstract: The effect of molybdenum oxide on the activity and durability of CeO₂-TiO₂ catalyst for NO reduction by NH₃ was examined. It was found that the introduction of Mo could improve the low-temperature NH₃-SCR activity and SO₂/H₂O durability of the CeO₂-TiO₂ catalyst and an optimal loading of Mo was 4 wt.%. The best MoO₃/CeO₂-TiO₂ catalyst displayed over 90% NO conversion from 200℃ to 400℃ and obtained 4-fold increase in NO conversion compared to CeO₂-TiO₂ at 150℃. The characterization results revealed that the number of Brönsted acid sites over MoO₃/CeO₂-TiO₂ was significantly increased, and the adsorption of nitrate species was dramatically weakened because of the coverage of MoO₃, which were favorable for the high NH₃-SCR performance. It is believed that the MoO₃/CeO₂-TiO₂ catalyst is a suitable substitute for the NH₃-SCR reaction.

Key words: DeNO_x, CeO₂-TiO₂ catalyst, MoO₃ modification, SO₂ poisoning, Surface acidity

Lulu Li, Peixiao Li, Wei Tan, Kaili Ma, Weixin Zou, Changjin Tang, Lin Dong. Enhanced low-temperature NH₃-SCR performance of CeTiO_x catalyst via surface Mo modification[J]. Chinese Journal of Catalysis, 2020, 41(2): 364-373.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(19)63437-6

https://www.cjcatal.com/EN/Y2020/V41/I2/364

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Enhanced low-temperature NH₃-SCR performance of CeTiO_x catalyst via surface Mo modification

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