Simultaneous Removal of NO_x and SO₂ by a Nonthermal Plasma Hybrid Reactor

Abstract

In previous research, a new nonthermal plasma hybrid reactor was developed for removing SO2 from flue gas. The high efficiency and cost performance were proven through experiments. However, the research on simultaneously removing SO2 and NO x has not yet been reported. The objective of this work is to find a high-efficiency multifunctional catalyst for simultaneous removal of SO2 and NO x from flue gas. In addition, we also studied the effects of temperature and discharge power on the SO2 and NO x oxidation fraction to find the optimum operation condition. The investigated catalysts are NiO/TiO2,V2O5/TiO2, and TiO2. The discharge power varies from 9 to 15 W, and the reaction temperature range is 200−450 °C. The experimental results show that NiO/TiO2 is the best among the three catalysts. Meanwhile, temperature and discharge power have a positive influence on SO2 oxidation in the case of using NiO/TiO2, while the effects on NO x and NO are negative.

Photochemical Removal of SO2 over TiO2-Based Nanofibers by a Dry Photocatalytic Oxidation Process

“…However, η a was 30 times higher with the addition of 0.3 g of CuTNs under UV light, indicating that the enhancement of SO 2 removal efficiency was more obviously related to the participation of light irradiation and photocatalysts. This is in satisfactory agreement with the findings in the literature. , By performing calculations, Obee et al demonstrated that in the absence of a catalyst under UV irradiation, singlet 1 SO 2 and three-line 3 SO 2 could be generated, which leads to homogeneous photocatalytic reaction of SO 2 . Subsequently, three-line 3 SO 2 palys an important role and could be directly oxidized through the following reaction: …”

“…This is in satisfactory agreement with the findings in the literature. 25,26 By performing calculations, Obee et al 27 demonstrated that in the absence of a catalyst under UV irradiation, singlet 1 SO 2 and three-line 3 SO 2 could be generated, which leads to homogeneous photocatalytic reaction of SO 2 . Subsequently, three-line 3 SO 2 palys an important role and could be directly oxidized through the following reaction:…”

Study on the Macro‐Kinetics of NO Advanced Oxidation Removal by Decomposition of Gas‐Phase H2O2 over γ‐Fe2O3@Fe3O4

“…Although wet flue gas desulfurization and ammonia‐based selective catalytic reduction (NH3‐SCR) processes have been widely used in the coal‐fired power plants for single pollutant removal, which lead to large and complex systems and the high capital and operating costs. In recent years, flue gas purification technologies, including plasma purification technology, adsorption purification technology, photo catalytic oxidation technology and ozone oxidation technology, have shown good development and application prospects. However, most of them are still in the laboratory stage due to technical or economic problems.…”

Preliminary Study on a New Technique for Wet Removal of Nitric Oxide from Simulated Flue Gas with an Ultraviolet (UV)/H2O2 Process

“…Because of low capital and operating costs and simultaneous removal of multiple pollutants, integrated removal technology has a good prospect of development and application. , Several integrated flue gas treatment technologies, such as plasma removal, , adsorbent adsorption removal, , oxidant oxidation removal, ,,,,− and complex adsorption removal, ,, have been developed in the last several decades. However, because of high costs or technical problems, these integrated technologies cannot still completely replace the combination of wet limestone−gypsum flue gas desulfurization and the selective catalytic reduction technologies .…”

“…Advanced oxidation processes can produce free radicals with strong oxidation, such as •OH, •O, and HO 2 •, to remove pollutants by oxidation reaction . Some advanced oxidation processes, such as plasma removal, , photocatalytic oxidation, − and sonochemistry oxidation, , have been developed to achieve integrated removal of multiple pollutants from flue gas. However, because of high costs or technical problems, they cannot yet achieve the goal of large-scale industrial application during in the near term .…”