Xu Wencong, Van Alphen Senne, Galvita Vladimir V, Meynen Vera, Bogaerts Annemie
Department of Chemistry, Research group LADCA, University of Antwerp, Universiteitsplein 1, B-2610 Wilrijk, Antwerp, Belgium.
Department of Chemistry, Research group PLASMANT, University of Antwerp, Universiteitsplein 1, B-2610 Wilrijk, Antwerp, Belgium.
ChemSusChem. 2024 Aug 26;17(16):e202400169. doi: 10.1002/cssc.202400169. Epub 2024 Apr 11.
Plasma-based CO conversion has attracted increasing interest. However, to understand the impact of plasma operation on post-plasma processes, we studied the effect of adding N, N/CH and N/CH/HO to a CO gliding arc plasmatron (GAP) to obtain valuable insights into their impact on exhaust stream composition and temperature, which will serve as feed gas and heat for post-plasma catalysis (PPC). Adding N improves the CO conversion from 4 % to 13 %, and CH addition further promotes it to 44 %, and even to 61 % at lower gas flow rate (6 L/min), allowing a higher yield of CO and hydrogen for PPC. The addition of HO, however, reduces the CO conversion from 55 % to 22 %, but it also lowers the energy cost, from 5.8 to 3 kJ/L. Regarding the temperature at 4.9 cm post-plasma, N addition increases the temperature, while the CO/CH ratio has no significant effect on temperature. We also calculated the temperature distribution with computational fluid dynamics simulations. The obtained temperature profiles (both experimental and calculated) show a decreasing trend with distance to the exhaust and provide insights in where to position a PPC bed.
基于等离子体的一氧化碳转化已引起越来越多的关注。然而，为了了解等离子体操作对等离子体后处理过程的影响，我们研究了向一氧化碳滑动弧等离子体发生器（GAP）中添加氮气、氮气/甲烷和氮气/甲烷/水蒸气的效果，以深入了解它们对排气流组成和温度的影响，这些将作为等离子体后催化（PPC）的原料气和热量。添加氮气可将一氧化碳转化率从4%提高到13%，添加甲烷进一步将其提高到44%，在较低气体流速（6L/min）下甚至可提高到61%，从而为PPC提供更高产率的一氧化碳和氢气。然而，添加水蒸气会将一氧化碳转化率从55%降低到22%，但同时也降低了能源成本，从5.8kJ/L降至3kJ/L。关于等离子体后4.9厘米处的温度，添加氮气会提高温度，而一氧化碳/甲烷比则对温度没有显著影响。我们还通过计算流体动力学模拟计算了温度分布。获得的温度分布（实验和计算结果）均显示出随着与排气口距离的增加而降低的趋势，并为PPC床的放置位置提供了参考。
