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Rational Design of Alkali‐Resistant NO Reduction Catalysts using a Stable Hexagonal V‐Doped MoO3 Support for Alkali Trapping
ChemCatChem ( IF 4.5 ) Pub Date : 2018-07-10 , DOI: 10.1002/cctc.201800818 Xiaona Liu 1 , Jiayi Gao 1 , Yaxin Chen 1 , Chao Li 1 , Junxiao Chen 1 , Weiye Qu 1 , Xin Chen 1 , Zhen Ma 1, 2 , Xingfu Tang 1, 2
ChemCatChem ( IF 4.5 ) Pub Date : 2018-07-10 , DOI: 10.1002/cctc.201800818 Xiaona Liu 1 , Jiayi Gao 1 , Yaxin Chen 1 , Chao Li 1 , Junxiao Chen 1 , Weiye Qu 1 , Xin Chen 1 , Zhen Ma 1, 2 , Xingfu Tang 1, 2
Affiliation
To avoid alkali poisoning in the selective catalytic reduction (SCR) of NOx with NH3, it is desirable to design SCR catalysts with abundant alkali‐trapping sites spatially separated from catalytically active sites. Here we develop such a catalyst with strong resistance against alkali poisoning by using hexagonal vanadium‐doped MoO3 (V‐HMoO) with alkali‐trapping tunnels as a catalyst support. Although pure HMoO also possesses strong alkali resistance due to size‐suitable tunnels, active Mo5+ ions on the framework make HMoO thermally unstable, and hence pure HMoO is not able to be used as a suitable support for SCR in a normal operating temperature window of 280–420 °C. We substitute the active Mo5+ by stable V5+ due to its fully unoccupied electron configuration to achieve a thermally stable V‐HMoO support, as confirmed by various characterization results. After loading active V2O5 onto the V‐HMoO support, the catalyst shows high SCR activity with excellent alkali resistance due to the alkali trapping function of V‐HMoO. This work may give a strategy to design stable alkali‐trapping SCR catalysts in general.
中文翻译:
使用稳定的六方V掺杂MoO3载体进行碱捕获的抗碱NO还原催化剂的合理设计
为了避免在用NH 3进行NO x选择性催化还原(SCR)时发生碱中毒,需要设计SCR催化剂,使其在空间上与催化活性位点隔开大量的碱捕获位。在这里,我们通过使用带有碱捕获通道的六方钒掺杂的MoO 3(V-HMoO)来开发具有强抗碱中毒性的催化剂。尽管纯净的HMoO由于具有合适的尺寸通道而还具有很强的耐碱性,但骨架上的活性Mo 5+离子使HMoO处于热不稳定状态,因此在正常工作温度范围内,纯净的HMoO不能用作SCR的合适载体。 280–420°C。我们用活性Mo 5+代替通过稳定的V 5+,由于其完全未被占用的电子构型来获得热稳定的V-HMoO载体,各种表征结果都证实了这一点。将活性V 2 O 5负载到V-HMoO载体上后,由于V-HMoO的碱捕获功能,该催化剂显示出较高的SCR活性和优异的耐碱性。这项工作通常可以为设计稳定的碱捕获SCR催化剂提供策略。
更新日期:2018-07-10
中文翻译:
使用稳定的六方V掺杂MoO3载体进行碱捕获的抗碱NO还原催化剂的合理设计
为了避免在用NH 3进行NO x选择性催化还原(SCR)时发生碱中毒,需要设计SCR催化剂,使其在空间上与催化活性位点隔开大量的碱捕获位。在这里,我们通过使用带有碱捕获通道的六方钒掺杂的MoO 3(V-HMoO)来开发具有强抗碱中毒性的催化剂。尽管纯净的HMoO由于具有合适的尺寸通道而还具有很强的耐碱性,但骨架上的活性Mo 5+离子使HMoO处于热不稳定状态,因此在正常工作温度范围内,纯净的HMoO不能用作SCR的合适载体。 280–420°C。我们用活性Mo 5+代替通过稳定的V 5+,由于其完全未被占用的电子构型来获得热稳定的V-HMoO载体,各种表征结果都证实了这一点。将活性V 2 O 5负载到V-HMoO载体上后,由于V-HMoO的碱捕获功能,该催化剂显示出较高的SCR活性和优异的耐碱性。这项工作通常可以为设计稳定的碱捕获SCR催化剂提供策略。