Vanadium-based catalysts are often used in selective catalytic reduction (SCR) technology for abating NO_x in diesel engine exhaust. However, their poor catalytic ability at low temperature, high toxicity and cost are big turnoffs. In this paper, the combination of non-thermal plasma (NTP) generated by dielectric barrier discharge and activated carbon (AC) is used to remove NO_x from diesel engine exhaust. The results show that the denitration efficiency of the NTP + AC + NH₃ system can reach 91.8% after 1 hour of NTP action at 0.5 kJ L⁻¹ energy density for simulated exhaust gas. The AC characterization results show that NTP increases the specific surface area of AC. AC is rather stable at 300 °C and the NTP + AC + NH₃ system can maintain high denitration efficiency for at least 5 hours. For real exhaust gas, the denitration efficiencies of the NTP + AC + NH₃ system can reach 92.5% (>300 °C) and 76.9% (<200 °C), respectively. There is great potential for NTP + AC + NH₃ technology to be a possible replacement for vanadium-based SCR in diesel engine exhaust denitration.

中文翻译：

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使用非热等离子体和活性炭的柴油机排气脱硝

钒基催化剂通常用于选择性催化还原（SCR）技术中，以减轻柴油机排气中的NO _x。然而，它们在低温下较差的催化能力，高毒性和成本是很大的缺点。在本文中，电介质阻挡层放电产生的非热等离子体（NTP）与活性炭（AC）的结合被用于去除柴油机排气中的NO _x。结果表明，在模拟废气中，NTP + AC + NH ₃系统在0.5 kJ L ^-1能量密度下，经过1小时的NTP处理后，脱硝效率可达到91.8％。AC表征结果表明，NTP增加了AC的比表面积。AC在300°C时相当稳定，而NTP + AC + NH ₃系统可以保持至少5小时的高脱硝效率。对于实际废气，NTP + AC + NH ₃系统的脱硝效率分别可以达到92.5％（> 300°C）和76.9％（<200°C）。NTP + AC + NH ₃技术在柴油机排气脱硝中有可能替代钒基SCR。