电离
电场
介孔材料
介质阻挡放电
多孔性
热电离
等离子体
电介质
材料科学
电子
原子物理学
电子密度
分子物理学
分析化学(期刊)
化学
电子电离
离子
催化作用
复合材料
光电子学
物理
量子力学
有机化学
生物化学
色谱法
作者
Ya Zhang,Hongyu Wang,Yuru Zhang,Annemie Bogaerts
标识
DOI:10.1088/1361-6595/aa66be
摘要
The formation process of a microdischarge (MD) in both μm- and nm-sized catalyst pores is simulated by a two-dimensional particle-in-cell/Monte Carlo collision model. A parallel-plate dielectric barrier discharge configuration in filamentary mode is considered in ambient air. The discharge is powered by a high voltage pulse. Our calculations reveal that a streamer can penetrate into the surface features of a porous catalyst and MDs can be formed inside both μm- and nm-sized pores, yielding ionization inside the pore. For the μm-sized pores, the ionization mainly occurs inside the pore, while for the nm-sized pores the ionization is strongest near and inside the pore. Thus, enhanced discharges near and inside the mesoporous catalyst are observed. Indeed, the maximum values of the electric field, ionization rate and electron density occur near and inside the pore. The maximum electric field and electron density inside the pore first increase when the pore size rises from 4 nm to 10 nm, and then they decrease for the 100 nm pore, due to a more pronounced surface discharge for the smaller pores. However, the ionization rate is highest for the 100 nm pore due to the largest effective ionization region.
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