Plasma Nitrogen Fixation: NO_x Synthesis in MnO_x/Al_2O_3 Packed-Bed Dielectric Barrier Discharge
Plasma Nitrogen Fixation: NO_x Synthesis in MnO_x/Al_2O_3 Packed-Bed Dielectric Barrier Discharge
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DOI：
10.1007/s11090-023-10345-8
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发表时间：
2023-06
影响因子：
3.6
通讯作者：
Tianzhu Zhang;Xiao‐Song Li;Jing‐Lin Liu;Xiao-qiong Wen;Aimin Zhu
中科院分区：
文献类型：
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作者：
Tianzhu Zhang;Xiao‐Song Li;Jing‐Lin Liu;Xiao-qiong Wen;Aimin Zhu
本文报道了MnOx/Al 2 O3填充床介质阻挡放电（DBD）等离子体固氮合成NOx的实验研究及MnOx/Al 2 O3催化剂的强化作用。当N2含量为50%、SEI约为16 kJ/mol（流量为800 SCCM、放电功率约为9.5 W）时，Al 2 O3和MnOx/Al 2 O3的NOx生成速率分别为0.28 SCCM和0.42 SCCM，MnOx/Al 2 O3的增强效应使NOx生成速率提高了约60%。在较低的比能输入（SEI）或较高的N2含量（较低的O2含量）下，增强效果更为显著。MnOx/Al 2 O3填充的DBD比Al 2 O3填充的DBD具有更多和更低强度的微放电、更大的总电容、更大的峰间电荷和更高的N2振动温度。通过两步表面反应过程和第一步吸附物种的原位程序升温脱附，揭示了MnOx/Al 2 O3催化剂的表面作用。
The plasma nitrogen fixation for NOxsynthesis from N2and O2in MnOx/Al2O3packed-bed dielectric barrier discharge (DBD) and an enhanced effect of MnOx/Al2O3catalyst are reported. At N2content of 50% andSEIof ~ 16 kJ/mol (flow rate of 800 SCCM and discharge power of ~ 9.5 W), NOxproduction rates are 0.28 SCCM for Al2O3and 0.42 SCCM for MnOx/Al2O3, and improved by ~ 60% due to the enhanced effect of MnOx/Al2O3. The enhanced effect becomes more significant at lower specific energy input (SEI) or higher N2content (lower O2content). The MnOx/Al2O3-packed DBD features much more and lower-intensity micro-discharges, larger total capacitance, greater peak-to-peak charge, and higher vibrational temperature of N2than the Al2O3-packed DBD. The surface role of MnOx/Al2O3catalyst in the enhanced effect was disclosed by two-step surface reaction processes and in-situ temperature programed desorption for the adsorbed species of the first step.