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Unveiling the Traits of Rare Earth Metal (RM)-Substituted Bimetallic Ce0.5RM0.5V1O4 Phases to Activate Selective NH3 Oxidation and NOX Reduction
Applied Surface Science ( IF 6.3 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.apsusc.2020.146238
Jongsik Kim , Dong Ho Kim , Dong Wook Kwon , Kwan-Young Lee , Heon Phil Ha

Abstract V2O5 contains V5+ accessible to NOX/NH3, thus having partial success in producing N2 via selective NOX reduction (SCR) and NH3 oxidation (SCO). V2O5, however, can be advanced by structural modification with rare-earth metal (RM) to form vanadate (RM1V1O4), wherein Lewis acidity of open V5+ is regulated by the type of RM along with the change in Bronsted acidity/redox character. Herein, TiO2-supported Ce1V1O4 served as adaptable platform, where half of Ce was replaced by RM (Tb, Er, or Yb) to form Ce0.5RM0.5V1O4 catalysts. The promotive effect anticipated by RM substitution for Ce0.5RM0.5V1O4 was insignificant at low temperatures. Conversely, high temperatures tuned the property of Ce0.5RM0.5V1O4 desirably. Ce0.5Er0.5V1O4 possessed the greatest Lewis acidity/redox feature, thus revealing the best performance in SCR/SCO at elevated temperatures. Hydro-thermal aging (HT) of the catalysts was repercussive to their properties to some extents and altered the kind of major surface sites for SCR/SCO. Bronsted acidity/redox trait primarily directed low-temperature SCR performance of Ce0.5RM0.5V1O4 (HT), yet, were the greatest in Ce0.5Er0.5V1O4 (HT). Meanwhile, Lewis acidity of Ce0.5RM0.5V1O4 (HT) dominated high-temperature SCR/SCO performance and again was the most desired in Ce0.5Er0.5V1O4 (HT). This paper demonstrated the vitality of RM innate to Ce0.5RM0.5V1O4 for accelerating SCR/SCO exposed to periodic HT.

中文翻译:

揭示稀土金属 (RM)-取代的双金属 Ce0.5RM0.5V1O4 相的特性以激活选择性 NH3 氧化和 NOX 还原

摘要 V2O5 含有可接近 NOX/NH3 的 V5+,因此在通过选择性 NOX 还原 (SCR) 和 NH3 氧化 (SCO) 生产 N2 方面取得了部分成功。然而,V2O5 可以通过用稀土金属 (RM) 进行结构改性以形成钒酸盐 (RM1V1O4),其中开路 V5+ 的路易斯酸度受 RM 的类型以及布朗斯台德酸度/氧化还原特性的变化的调节。在此,TiO2 负载的 Ce1V1O4 作为适应性平台,其中一半的 Ce 被 RM(Tb、Er 或 Yb)取代以形成 Ce0.5RM0.5V1O4 催化剂。RM 替代 Ce0.5RM0.5V1O4 所预期的促进作用在低温下是微不足道的。相反,高温会合乎需要地调整 Ce0.5RM0.5V1O4 的特性。Ce0.5Er0.5V1O4 具有最大的路易斯酸度/氧化还原特性,因此揭示了 SCR/SCO 在高温下的最佳性能。催化剂的水热老化(HT)在一定程度上影响了它们的性能,并改变了 SCR/SCO 的主要表面位点的种类。布朗斯台德酸度/氧化还原特性主要针对 Ce0.5RM0.5V1O4 (HT) 的低温 SCR 性能,但在 Ce0.5Er0.5V1O4 (HT) 中是最大的。同时,Ce0.5RM0.5V1O4 (HT) 的路易斯酸度主导了高温 SCR/SCO 性能,也是 Ce0.5Er0.5V1O4 (HT) 中最理想的。本文证明了 RM 固有的对 Ce0.5RM0.5V1O4 的生命力,用于加速暴露于周期性 HT 的 SCR/SCO。Bronsted 酸度/氧化还原特性主要针对 Ce0.5RM0.5V1O4 (HT) 的低温 SCR 性能,但在 Ce0.5Er0.5V1O4 (HT) 中是最大的。同时,Ce0.5RM0.5V1O4 (HT) 的路易斯酸度主导了高温 SCR/SCO 性能,也是 Ce0.5Er0.5V1O4 (HT) 中最理想的。本文证明了 RM 固有的对 Ce0.5RM0.5V1O4 的生命力,用于加速暴露于周期性 HT 的 SCR/SCO。Bronsted 酸度/氧化还原特性主要针对 Ce0.5RM0.5V1O4 (HT) 的低温 SCR 性能,但在 Ce0.5Er0.5V1O4 (HT) 中是最大的。同时,Ce0.5RM0.5V1O4 (HT) 的路易斯酸度主导了高温 SCR/SCO 性能,也是 Ce0.5Er0.5V1O4 (HT) 中最理想的。本文证明了 RM 固有的对 Ce0.5RM0.5V1O4 的生命力,用于加速暴露于周期性 HT 的 SCR/SCO。
更新日期:2020-07-01
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