Laboratory of Pollution Exposure and Health Intervention Technology, College of Biological and Environment Engineering, Zhejiang Shuren University, Hangzhou 310015, China.
Laboratory of Pollution Exposure and Health Intervention Technology, College of Biological and Environment Engineering, Zhejiang Shuren University, Hangzhou 310015, China; Engineering Research Center of the Ministry of Education for Bioconversion and Biopurification, Zhejiang University of Technology, Hangzhou 310032, PR China.
J Colloid Interface Sci. 2022 Feb;607(Pt 2):1189-1200. doi: 10.1016/j.jcis.2021.09.110. Epub 2021 Sep 22.
NO and toluene have been identified as the dominant air pollutants in solid wasted combustion, and it is of great importance to remove these two pollutants simultaneously. Here, we found that Mn/CeO and Mn/TiO exhibited a bifunctional property in both NO reduction and toluene oxidation, and both of which could achieve 80% of conversion rate in NO reduction and toluene oxidation processes. However, the activity of both Mn/CeO and Mn/TiO decreased in simultaneous removal of NO and toluene compared with separate NO reduction and toluene oxidation. This indicates that there is a mutual inhibition between NO reduction and toluene oxidation in simultaneous removal process over Mn-based catalysts, attributing to the competitive adsorption and utilization of active oxygen. In detail, the adsorption of toluene occupied the Lewis acid sites and restrained the NH adsorption. Meanwhile, the competitive utilization of active oxygen by NH/NO inhibited toluene oxidation to CO by active oxygen species as the reaction between NH/NO and active oxygen species would occur more easily.
已确定 NO 和甲苯是固体废物燃烧中的主要空气污染物，因此同时去除这两种污染物非常重要。在这里，我们发现 Mn/CeO 和 Mn/TiO 在 NO 还原和甲苯氧化过程中均表现出双功能特性，均可在 NO 还原和甲苯氧化过程中达到 80%的转化率。然而，与单独的 NO 还原和甲苯氧化相比，Mn/CeO 和 Mn/TiO 在同时去除 NO 和甲苯时的活性均降低。这表明，在 Mn 基催化剂的同时去除过程中，NO 还原和甲苯氧化之间存在相互抑制作用，这归因于活性氧的竞争吸附和利用。具体而言，甲苯的吸附占据了路易斯酸位，并抑制了 NH 的吸附。同时，NH/NO 对活性氧的竞争利用抑制了甲苯氧化为 CO，因为 NH/NO 和活性氧物种之间的反应更容易发生。
