论文标题
通过等离子体诊断介绍血浆氨合成的血浆氨合成过程中产生的不同状态
Unraveling the different regimes arisen during plasma ammonia synthesis on mesoporous silica SBA-15 through plasma diagnostics
论文作者
论文摘要
本文中，我们证明了在血浆氨合成期间浸渍的介孔二氧化硅SBA-15和SBA-15-AG的性能取决于血浆条件。在高功率下，没有AG的介孔二氧化硅SBA-15在我们的实验中观察到的氨水最大，但Ag的添加在较低的功率下提供了较小的益处。使用N2，N2+和NH分子带和Hα线的光发射光谱分析血浆条件。光学发射，特别是HA线和N2分子带的数据的分析表明，SBA-15具有较高的电子密度和较高的N2振动温度。相对于中性N2，更强的N2+发射为SBA-15填充床反应器中较高的电子密度提供了更多证据。 AG的添加导致原子氢的浓度较低。 Ag充当氢下水道促进与氮的表面反应。频谱中的NH存在可能表明SBA-15反应器中H浓度较高。从材料的角度来看，SBA-15是一种更强大的催化剂，由于在结构中金属时缺乏局部加热，因此在血浆暴露后具有值得称赞的表面积保留。
Herein we demonstrate that the performance of mesoporous silica SBA-15 and SBA-15-Ag impregnated during plasma ammonia synthesis depend on the plasma conditions. At high power the mesoporous silica SBA-15 without Ag produces the largest amount of ammonia observed in our experiments, but the addition of Ag provides a minor benefit at lower powers. Plasma conditions were analyzed using optical emission spectroscopy using N2, N2+ and NH molecular bands and Hα lines. The analysis of optical emission, specifically Ha lines and N2 molecular bands data shows that SBA-15 has higher electron density, and higher N2 vibrational temperature. Stronger N2+ emission relative to the neutral N2 provides additional evidence for higher electron density in the SBA-15 packed bed reactors. The addition of Ag resulted in a lower concentration of atomic hydrogen. Where Ag acts as a hydrogen sink facilitating surface reactions with nitrogen. The presence NH in the spectrum may indicate a higher concentration of H in the SBA-15 reactor. From the materials point of view SBA-15 is a more robust catalyst with a commendable surface area retention after plasma exposure due to the lack of local heating generated when a metal is in the structure.
