Hybrid TiO₂ based plasma-catalytic reactors for the removal of hazardous gasses

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• 作者：Indrek J&otilde ; gi ; ^{indrek.jogi@ut.ee" class="auth_mail} ; Ants Haljaste ; Matti Laan
• 关键词：Dielectric barrier discharge ; TiO2 catalyst ; NO oxidation ; SO2 removal
• 刊名：Surface and Coatings Technology
• 出版年：15 March, 2014
• 年：2014
• 卷：242
• 期：Complete
• 页码：195-199
• 全文大小：863 K

文摘

The paper deals with the removal of hazardous gasses by hybrid plasma-catalytic reactors. Coaxial dielectric barrier discharge (DBD) reactor was used for the generation of plasma and a layer of catalytic TiO₂ powder was pressed on the inner wall of the plasma reactor to allow direct contact between the plasma and catalyst. The reactor was used for the oxidation of NO or SO₂ in the mixture with 10% O₂ and N₂ balance. In some cases, H₂O vapor or CO₂ was added to the mixture to investigate the effect of these exhaust gas constituents on the NO removal. The presence of TiO₂ coating in the reactor zone increased the oxidation efficiency for both treated gasses but was more pronounced in the case of SO₂. There were also some differences regarding the effect of temperature and humidity. It was necessary to use higher temperatures to increase the removal efficiency of NO by TiO₂ catalyst compared to SO₂. In humid conditions, the removal of NO was further increased by the TiO₂ catalyst while the enhancement of SO₂ removal by catalyst was not detectable.