The effect of TiO2 coatings on the formation of ozone and nitrogen oxides in non-thermal atmospheric pressure plasma
The effect of TiO2 coatings on the formation of ozone and nitrogen oxides in non-thermal atmospheric pressure plasma
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DOI：
10.1016/j.jece.2021.106046
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发表时间：
2021-10
影响因子：
7.7
通讯作者：
Samuel C. Capp;D. Sawtell;C. Banks;P. Kelly;Zaenab Abd-Allah
中科院分区：
文献类型：
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作者：
Samuel C. Capp;D. Sawtell;C. Banks;P. Kelly;Zaenab Abd-Allah
在等离子体系统中使用光催化材料有可能提高所需产品的选择性和产量。然而，光催化剂和等离子体之间的表面相互作用是一个复杂的过程，目前尚不清楚。这项工作全面研究了二氧化钛 (TiO2) 光催化剂与非热常压氮氧等离子体相结合的效果，增加了臭氧和五氧化二氮 (N2O5) 的产量，同时限制了有害二氧化氮 (NO2) 和一氧化二氮 (N2O) 副产物的形成。 TiO2 涂层通过磁控溅射沉积在钛酸钡 (BaTiO3) 颗粒上，用于填充床介质阻挡放电反应器 (DBD)。二氧化钛的存在可以通过充当原子氧的接收器、通过光催化形成超氧阴离子自由基 (O2-) 以及改变 BaTiO3 颗粒的介电常数来影响 DBD 中的等离子体化学。这项工作解释了这些影响对氧和氮等离子体化学的复杂相互作用。研究了光催化剂表面性质、气体组成和停留时间对臭氧和氮氧化物（NxOy）形成反应途径的影响。通过对涂层表面进行退火，二氧化钛的光催化活性得到提高，随后发现能够形成臭氧，增加 N2O5 的形成，同时显着减少有害 NO2 和 N2O 的形成，停留时间为 0.011 s
The use of photocatalytic materials in plasma systems has the potential to enhance the selectivity and yield of desired products. However, the surface interaction between the photocatalyst and plasma is a complex process that is not well understood. This work presents a comprehensive study of the effects of combining titanium dioxide (TiO2) photocatalysts with non-thermal atmospheric pressure nitrogen-oxygen plasmas, which increases the production of ozone and dinitrogen pentoxide (N2O5) while limiting the formation of harmful nitrogen dioxide (NO2) and nitrous oxide (N2O) by products. TiO2coatings were deposited by magnetron sputtering onto barium titanate (BaTiO3) particulates for use within a packed bed dielectric barrier discharge reactor (DBD). The presence of titanium dioxide can affect the plasma chemistry in the DBD by acting as a sink for atomic oxygen, through photocatalytic formation of superoxide anion radical (O2-), and alteration of the dielectric constant of the BaTiO3particulates. This work explains the complex interaction of these effects on oxygen and nitrogen plasma chemistry. The effect of the photocatalyst surface properties, gas composition and residence time on the reaction pathways for the formation of ozone and nitrogen oxides (NxOy) were investigated. The photocatalytic activity of titanium dioxide was improved by annealing the coated surface, and was subsequently found to enable the formation of ozone, increase the formation of N2O5while significantly decreasing the formation of harmful NO2and N2O with a residence time of 0.011 s