Insights into modified red mud for the selective catalytic reduction of NOx: Activation mechanism of targeted leaching.,Journal of Hazardous Materials

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Insights into modified red mud for the selective catalytic reduction of NOx: Activation mechanism of targeted leaching.
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2020-03-24 , DOI: 10.1016/j.jhazmat.2020.122536
Zhiqiang Gong ₁ , Jun Ma ₂ , Dong Wang ₃ , Shengli Niu ₁ , Bohui Yan ₁ , Qinglong Shi ₁ , Chunmei Lu ₁ , John Crittenden ₃

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Red mud (RM) is a solid waste rich in iron oxide, which has the potential to be utilized as the catalyst for selective catalytic reduction (SCR) of NOx. We pretreated the RM sample with the selective acid leaching method, after which 97.6 % of the alkali was neutralized, and only 8 % of the Fe2O3 were leached out. Once leached, the RM samples were activated for the SCR reaction. It showed NOx conversions above 90 % in 310-430 °C and exhibited high resistance to SO2 and H2O. After leaching, i. the SBET reached twice as before; ii. the sintering caused by alkali was eliminated; iii. the activated RM exhibited improved Fe3+/Fe2+ ratio and enhanced chemisorbed surface oxygen (Oα); iv. the oxygen mobility and the surface acidity were promoted. Overall, the selective acid leaching is an efficient method to activate RM for the SCR reaction. The RM based catalysts can be an alternative for SCR technology.

中文翻译：

深入了解用于选择性催化还原NOx的改性赤泥：目标浸出的活化机理。

赤泥（RM）是一种富含氧化铁的固体废物，有潜力用作NOx选择性催化还原（SCR）的催化剂。我们用选择性酸浸法对RM样品进行了预处理，然后中和了97.6％的碱，只有8％的Fe2O3被浸出。一旦浸出，就将RM样品活化用于SCR反应。在310-430°C下，NOx转化率超过90％，并且对SO2和H2O表现出较高的抵抗力。浸出后，我。SBET达到以前的两倍；ii。消除了碱引起的烧结。iii。活化的RM表现出改善的Fe3 + / Fe2 +比和增强的化学吸附表面氧（Oα）；iv。促进了氧的迁移率和表面酸度。总体而言，选择性酸浸法是激活RM用于SCR反应的有效方法。

更新日期：2020-03-26

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