脉冲放电产生医用NO副产物NO2的去除

NO已被证明是血管舒张因子，临床上用来治疗急性呼吸衰竭，医疗要求的NO体积分数一般为5×10^－6～20×10^－6。在干燥空气中进行脉冲放电可以产生满足临床要求的NO，但同时也会产生对人体有很大伤害的NO₂。因此，必须把NO₂的体积分数降低到满足临床要求的<3×10_－6，V(NO₂)∶V(NOx)<5%。利用钼丝在一定的温度下将NO₂转化为NO，在350～500 ℃时NO₂转化率为30%～60％。研究了温度和钼丝直径对催化反应效率的影响，并对催化反应器设计和反应机理进行了探讨。

Removal of nitrogen dioxide from pulsed arc for generation medicinal inhaled nitric oxide

Inhaled nitric oxide (INO) has been identified as the endothelium-derived relaxing factor (EDRF), used to treat acute respiratory distress syndrome (ARDF) for clinical applications. Usually, the concentration of NO for medical treatment is 5×10^－6-20×10－6. NO for medical applications can be generated by pulsed arc discharge in fresh air. However, nitrogen dioxide (NO2) , as a byproduct, is also generated, which is harmful even at very low concentration. In clinical applications, concentration of NO2 must be less than 3×10^－6 and V(NO₂)∶V(NOx) be less than 5%. In this paper, NO2 was converted to NO with molybdenum(Mo) wires. Results showed that NO2 conversion increased from 30% to 60％ when temperature was raised from 350 ℃ to 500 ℃.The influence of temperature and diameter of Mo wires was investigated and design of the reactor and reaction mechanism discussed.