Key Lab of Applied Chemistry of Zhejiang Province, Department of Chemistry, Zhejiang University (XiXi Campus), Hangzhou 310028, China.
Environ Sci Technol. 2012 Feb 21;46(4):2337-44. doi: 10.1021/es203405c. Epub 2012 Feb 3.
A combined adsorption-discharge plasma catalytic process was used for the removal of NO(x) using zeolites as catalysts without external heating. It was found that the types of plasma carrier gases exert great effect on the conversion of adsorbed NO(x). The conversion of adsorbed NO(x) is much lower in N(2) plasma than in Ar plasma, which is attributed to the reverse reaction, NO(x) formation reaction. The momentary increase of oxygen species derived from the decomposition of adsorbed NO(x) is considered to be the main cause as their collisions with nitrogen species can generate NO(x) again. Thus, solid carbon was added to the catalyst to act as a scavenger for active oxygen species to improve the conversion of adsorbed NO(x) in N(2) plasma. A NO(x) removal rate of 97.8% was obtained on 8.5wt.% carbon mixed H-ZSM-5 at an energy efficiency of 0.758 mmol NO(x)/W·h.
采用组合吸附-放电等离子体催化工艺，在无需外部加热的情况下，使用沸石作为催化剂去除 NO(x)。研究发现，等离子体载气的类型对吸附态 NO(x)的转化有很大影响。在 N(2)等离子体中，吸附态 NO(x)的转化率远低于 Ar 等离子体，这归因于逆反应，即 NO(x)生成反应。来自吸附态 NO(x)分解的氧物种的瞬时增加被认为是主要原因，因为它们与氮物种的碰撞会再次生成 NO(x)。因此，在催化剂中添加固体碳作为活性氧物种的清除剂，以提高 N(2)等离子体中吸附态 NO(x)的转化率。在能量效率为 0.758mmolNO(x)/W·h 的条件下，在 8.5wt.%掺碳的 H-ZSM-5 上可获得 97.8%的 NO(x)去除率。
