Al2O3在脉冲等离子体降解CFC-113中提高转化率的作用机理

催化剂α-Al₂O₃可显著提高脉冲电晕等离子体降解CFC-113的转化率，高达95.5%。着重从物理角度深入研究了催化剂的增效机理：催化剂颗粒表面附近的等离子体鞘层有利于离子和电子的加速；等离子体中的离子、电子、激发态中性分子及亚稳态自由基团等活性粒子与反应器中固体表面的相互作用可促进降解；颗粒孔隙附近产生的局部电晕放电可显著提高附近离子和电子的动能。孔径小、比表面积大的Al₂O₃颗粒能更好地提高CFC-113的转化率，并从脉冲放电粒子荷电等机理出发分析，原因在于局部电晕场较多较强、吸附能力较高。

Mechanisms for conversion-enhancing effects of Al2O3 in decomposition of CFC-113 in pulsed plasma

Application of α-Al₂O₃catalyst in decomposition of CFC-113 in pulsed corona plasma can remarkably enhance the conversion of CFC-113 up to 95.5%. Thefunctioning mechanism of the catalyst was discussed mainly from viewpoints of physics. The plasma sheaths near surfaces of the catalyst pellets promote the acceleration of ions and electrons; interactions between the active species (ions, electrons, excited-state neutral molecules and metastable free radicals) in the plasma and the solid surfaces in the reactor promote the decomposition process; local corona discharged near the small pores on the pellet surface greatly increases kinetic energy of the nearby ions and electrons. Al₂O₃ pellets with smaller pore and larger surface area enhance CFC-113 conversion better, which is due totheir more and stronger local corona fields and higher absorption ability.