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.
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/A1 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.