CAJ | 학술논문

为了对NO进行有效的净化,研究了一种新型催化剂--铜/海泡石.海泡石用盐酸进行改性,由正交实验优化确定了改性条件:盐酸浓度为1.2 mol/L;固液体积比为1:20;浸泡时间为20 h和浸泡温度为333 K.研究表明,在稀薄燃烧条件下,铜/海泡石对NO的还原具有良好的催化活性.Cu负载量为5%,灼烧成型温度为673 K条件下制备的催化剂具有最好的活性,593 K时,NO的转化率达90%.掺入稀土元素Ce和Sm可以提高铜/海泡石的催化性能.考察了氧成分和空速等对催化活性的影响,并用TGA,XRD,H2-TPR和BET等对该催化剂进行表征.实验结果表明:铜/海泡石是一种NO选择催化还原的有效催化剂.
위료대NO진행유효적정화,연구료일충신형최화제--동/해포석.해포석용염산진행개성,유정교실험우화학정료개성조건:염산농도위1.2 mol/L;고액체적비위1:20;침포시간위20 h화침포온도위333 K.연구표명,재희박연소조건하,동/해포석대NO적환원구유량호적최화활성.Cu부재량위5%,작소성형온도위673 K조건하제비적최화제구유최호적활성,593 K시,NO적전화솔체90%.참입희토원소Ce화Sm가이제고동/해포석적최화성능.고찰료양성분화공속등대최화활성적영향,병용TGA,XRD,H2-TPR화BET등대해최화제진행표정.실험결과표명:동/해포석시일충NO선택최화환원적유효최화제.
In order to achieve effective removal of NO, A new kind of catalyst, Cu/sepiolite, was investigated.Sepiolite was modified by hydrochloric acid. The modification conditions optimized by orthogonal experiments were: the concentration of hydrochloric acid 1.2 mol/L, the solid/liquid volume ratio 1:20, the soaking time 20 h, and the soaking temperature 333 K. Cu/sepiolite was active for NO reduction with CO under lean-burn condition. The maximum activity was observed on the Cu (w = 0.05) /sepiolite calcinated at 673 K and the conversion of NO reached up 90% at 593 K. The addition of Ce and Sm to Cu catalysts could improve the reaction properties. The effects of oxygen content and the GHSV (gas hourly space velocity) on the catalytic activity were also studied. The samples were characterized by thermo-gravimetric analysis (TGA), X-ray diffraction (XRD), temperature-programmed-reduction of H2 (H2-TPR) and BET. The experiment results show that Cu/sepiolite is effective for selective catalytic reduction of NO.