Effect of Nb Promoter on the Structure and Performance of Iron Titanate Catalysts for the Selective Catalytic Reduction of NO with NH3,Industrial & Engineering Chemistry Research

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Effect of Nb Promoter on the Structure and Performance of Iron Titanate Catalysts for the Selective Catalytic Reduction of NO with NH3
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-05-24 , DOI: 10.1021/acs.iecr.8b01441
Kai Cheng _{1,

2} , Bing Liu ₁ , Weiyu Song ₁ , Jian Liu ₁ , Yongsheng Chen ₂ , Zhen Zhao ₁ , Yuechang Wei ₁

Affiliation

Iron titanate catalysts with variable Nb content was synthesized by the homogeneous precipitation method, and they were applied to the NH₃-selective catalytic reduction (SCR). The widest performance temperature window is obtained on the 0.05Nb–0.95Fe–Ti–O catalyst between 200 and 400 °C with a NO conversion higher than 90% at a gas hourly space velocity (GHSV) of 50 000 h^–1. The addition of Nb improves the acidity of Fe–Ti–O catalyst while decreasing its reducibility. The excellent performance of 0.05Nb–0.95Fe–Ti–O is attributed to its suitable acidity and reducibility. Both Brønsted and Lewis acid sites over 0.05Nb–0.95Fe–Ti–O catalyst are active in the reaction, and the formation of reactive monodentate nitrate species and cis-N₂O₂^2– also promote the performances.

中文翻译：

铌促进剂对钛铁催化剂对NH ₃选择性还原NO的结构和性能的影响

通过均相沉淀法合成了Nb含量可变的钛酸铁催化剂，并将其用于NH _3-选择性催化还原（SCR）。在200至400°C之间的0.05Nb–0.95Fe–Ti–O催化剂上可获得最宽的性能温度范围，在50 000 h ^–1的气体时空速（GHSV）下，NO转化率高于90％。Nb的添加改善了Fe–Ti–O催化剂的酸度，同时降低了其还原性。0.05Nb–0.95Fe–Ti–O的优异性能归因于其合适的酸度和还原性。0.05Nb–0.95Fe–Ti–O催化剂上的布朗斯台德和路易斯酸位均在反应中具有活性，并形成反应性单齿硝酸盐物种和顺式-N ₂ O_{2 2}^–还促进表演。

更新日期：2018-05-25

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