Cu-ZSM-5对燃气烟气中NO的吸附特性

由于燃气烟气中水含量高，从预处理条件、H₂O含量和O₂含量方面考察Cu-ZSM-5分子筛吸附NO的影响.实验结果表明：在5%O₂，无水条件下，Cu-ZSM-5（Si/Al=25）吸附效果最好，穿透吸附量为0.8371mmol/g；通过FT-IR验证NTP预处理能够有效去除Cu-ZSM-5分子筛中H₂O，并保留-OH吸附位；H₂O的存在能够明显抑制Cu-ZSM-5的吸附能力，在烟气含8%H₂O的条件下，Cu-ZSM-5穿透吸附量下降至0.09566mmol/g，相比之下，混合吸附剂CMS/La-Cu-ZSM-5=1/9穿透吸附量可达0.1889mmol/g；O₂的存在可以有效促进NO吸附，但在10% O₂时出现了氧抑制现象；通过TPD和FT-IR分析，Cu-ZSM-5吸附物种以NO₂，NO，-NO₃为主，而在8% H₂O条件下，-NO₃含量较少.

Adsorption characteristics of NO in gas-fired gas on Cu-ZSM-5molecular sieve

Effect of pretreatment condition, H₂O and O₂ content on NO adsorption on Cu-ZSM-5molecular sieve was investigated in this experiment. The results showed that in the condition of 5% oxygen and none water Cu-ZSM-5 molecular sieve with the Si/Al ratio of 25had the best adsorption effect, whose breakthrough absorption amount was 0.8371mmol per gram. It had proved that water could be effectively removed by the non-thermal plasma(NTP) pretreatment on Cu-ZSM-5 molecular sieve using FT-IR method, and adsorption site of -OH retained. The water inhibited the adsorption capacity on Cu-ZSM-5 molecular sieve effectively, and breakthrough absorption amount was 0.09566mmol per gram. However, the adsorption capacity of mixed adsorbent, with the carbon molecular sieve(CMS)/La-Cu-ZSM-5 volume of nine, reached to 0.1889mmol per gram when the water content was 8%. While oxygen promoted the adsorption of nitric oxide, it inhibited the adsorption capacity on Cu-ZSM-5molecular sieve when the volume fraction of oxygen was 10%; TPD and FT-IR analysis showed adsorption species on Cu-ZSM-5molecular sieve was composed of NO₂, NO and -NO₃, when water content was 8%, the content of -NO₃ species was low.