Degradation properties and mechanism of naphthalene from exhaust gas using dielectric barrier discharge
WU Zu-liang1, XIE De-yuan1, LU Hao1, YAO Shui-liang1, GAO Xiang2
1. College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China; 2. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
Effects of the initial volume fraction of naphthalene, residence time and exhaust gas components on naphthalene degradation process were analyzed. The naphthalene degradation mechanism was explored through byproducts analysis. Degradation efficiency decreases with the increasing initial volume fraction, while the energy utilization efficiency improves. When the residence time is prolonged, the degradation efficiency trends to be stable, while the COx selection rate enhances step by step. The degradation efficiency can reach above 70% as the volume fraction of oxygen gas from exhausted gas is 3%, but the COx selection rate is only 30%. The degradation efficiency is relatively stable when the volume fraction of oxygen gas is 3%-20%, while the COx selection rate gradually increases and goes to 77% at 20% volume fraction of oxygen gas. According to the degradation byproducts, nitrogen gas excited state plays an important role during the initial degradation of naphthalene. And O radical can promote the naphthalene degradation through some direct collision reactions. However, complete degradation of naphthalene depends on O and OH radicals.
WU Zu-liang, XIE De-yuan, LU Hao, YAO Shui-liang, GAO Xiang. Degradation properties and mechanism of naphthalene from exhaust gas using dielectric barrier discharge. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2014, 48(6): 1120-1126.
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