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In Situ XANES Characterization of V2O5/TiO2–SiO2–MoO3 Catalyst for Selective Catalytic Reduction of NO by NH3
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-07-02 , DOI: 10.1021/acs.iecr.0c02308 Ryoji Kuma 1 , Tomoyuki Kitano 2 , Takuya Tsujiguchi 1 , Tsunehiro Tanaka 3, 4
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-07-02 , DOI: 10.1021/acs.iecr.0c02308 Ryoji Kuma 1 , Tomoyuki Kitano 2 , Takuya Tsujiguchi 1 , Tsunehiro Tanaka 3, 4
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The structures of V2O5 catalysts for the selective catalytic reduction (SCR) of NO by NH3 at low temperatures are investigated using in situ V K-edge X-ray absorption near-edge structure measurements. The V2O5 catalyst supported on TiO2–SiO2–MoO3 mixed oxide (V/TSM) showed a significantly steep increase in the main-edge energy at the beginning of the reaction. The results indicate that the excellent NH3-SCR catalytic activity of V/TSM can be ascribed to the remarkable V4+-to-V5+ reoxidation capability and easier V5+-to-V4+ reducibility. This improved redox reactivity is induced by the interaction of the highly dispersed polymeric vanadate with TSM solid solution and by the appropriate surface geometry of vanadium species, which enabled contact with NH3 and O2 in the gas phase. The results reported herein should enable the development of improved catalysts for NH3-SCR.
中文翻译：
用于NH 3选择性催化还原NO的V 2 O 5 / TiO 2 -SiO 2 -MoO 3催化剂的原位XANES表征
使用原位V K边缘X射线吸收近边缘结构测量研究了用于在低温下通过NH 3选择性催化还原NO的V 2 O 5催化剂的结构。负载在TiO 2 -SiO 2 -MoO 3混合氧化物（V / TSM）上的V 2 O 5催化剂在反应开始时主边缘能量明显增加。结果表明，V / TSM优异的NH 3 -SCR催化活性可归因于显着的V 4+ -to-V 5+再氧化能力和更容易的V 5+-to-V 4+可简化性。高度分散的聚合钒酸盐与TSM固溶体的相互作用以及钒物种的适当表面几何形状（可与气相中的NH 3和O 2接触）可诱发这种改善的氧化还原反应性。本文报道的结果应能够开发用于NH 3 -SCR的改进的催化剂。
更新日期：2020-07-29
中文翻译：
用于NH 3选择性催化还原NO的V 2 O 5 / TiO 2 -SiO 2 -MoO 3催化剂的原位XANES表征
使用原位V K边缘X射线吸收近边缘结构测量研究了用于在低温下通过NH 3选择性催化还原NO的V 2 O 5催化剂的结构。负载在TiO 2 -SiO 2 -MoO 3混合氧化物（V / TSM）上的V 2 O 5催化剂在反应开始时主边缘能量明显增加。结果表明，V / TSM优异的NH 3 -SCR催化活性可归因于显着的V 4+ -to-V 5+再氧化能力和更容易的V 5+-to-V 4+可简化性。高度分散的聚合钒酸盐与TSM固溶体的相互作用以及钒物种的适当表面几何形状（可与气相中的NH 3和O 2接触）可诱发这种改善的氧化还原反应性。本文报道的结果应能够开发用于NH 3 -SCR的改进的催化剂。
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