欢迎登录材料期刊网

材料期刊网

高级检索

采用聚合羟基复合阳离子合成交联黏土Al-Ce-PILC, 经SO2-4改性后,以浸渍法制备了铜基交联黏土催化剂Cu/Al-Ce-PILC, 并将其应用于C3H6选择性还原NO的反应,考察了预处理气氛、 O2和C3H6浓度、空速、水蒸气和SO2等反应条件对催化剂性能的影响. 结果表明, He预处理后催化剂表面的Cu物种以Cu+和Cu2+两种形式存在,而H2预处理后仅以Cu+存在, NO转化率最大值由23%升至56%. 反应体系中适当的O2和C3H6浓度可促进NO还原为N2, 但过高的浓度反而可降低NO的还原活性, O2同时可起到抑制积炭、清洁催化剂表面的作用. NO转化率随着空速的增大而降低. 10%水蒸气的存在可抑制NO的还原和C3H6的氧化,其转化率曲线向高温方向位移. 但是,由于金属氧化物交联柱表面的疏水特性, Cu/Al-Ce-PILC较Cu/ZSM-5具有较强的耐湿热稳定性, NO和C3H6最大转化率仅分别下降13%和5%. SO2的存在明显抑制了催化剂的低温活性,但对高温活性有一定促进作用.

参考文献

[1] Iwamoto M;Yahiro H;Shundo S;Yuu Y,Mizuno N .[J].Applied Catalysis,1991,69(02):L15.
[2] Ciambelli P;Corbo P;Migliardini F .[J].Catalysis Today,2000,59(3-4):279.
[3] Sierraalta A;Bermudez A;Rosa-Brussin M .Density functional study of the interaction of Cu+ ion-exchanged zeolites with H2O and SO2 molecules[J].Journal of molecular catalysis, A. Chemical,2005(1/2):203-210.
[4] 石晓燕,张长斌,贺泓.富氧条件下Ag/Al2O3和Cu/Al2O3组合催化剂催化C3H6选择性还原Nox的性能[J].催化学报,2005(01):69-73.
[5] Burch R.;Breen JP.;Meunier FC. .A review of the selective reduction of NOx, with hydrocarbons under lean-burn conditions with non-zeolitic oxide and platinum group metal catalysts [Review][J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2002(4):283-303.
[6] Yang R T;Tharappiwattananon N;Long R Q .[J].Applied Catalysis B:Environmental,1998,19(3-4):289.
[7] 林绮纯,林维明,郝吉明,李俊华,傅立新.Cu含量对Cu/Al-Ce-PILC上丙烯选择性催化还原NO反应的影响[J].催化学报,2005(09):740-744.
[8] 林绮纯,林维明,郝吉明,李俊华,傅立新.载体酸性对铜基交联黏土催化剂上C3H6选择性催化还原NO反应的影响[J].高等学校化学学报,2006(01):85-88.
[9] 阎子峰.纳米催化技术[M].北京:化学工业出版社,2003:542.
[10] Iwamoto M;Mizuno N;Yahiro H .[J].Studies in surface science and catalysis,1992,75:1285.
[11] Long RQ.;Yang RT. .Pt/MCM-41 catalyst for selective catalytic reduction of nitric oxide with hydrocarbons in the presence of excess oxygen[J].Catalysis Letters,1998(1/2):91-96.
[12] Armor J N .[J].Applied Catalysis B:Environmental,1994,4(2-3):N18.
[13] Gopalakrishnan R;Stafford P R;Davidson J E;Hecker W C,Bartholomew C H .[J].Applied Catalysis B:Environmental,1993,2(2-3):165.
[14] Kim B S;Lee S H;Park Y T;Ham S W,Chae H J,Nam I S .[J].Korean Journal of Chemical Engineering,2001,18(05):704.
上一张 下一张
上一张 下一张
计量
  • 下载量()
  • 访问量()
文章评分
  • 您的评分:
  • 1
    0%
  • 2
    0%
  • 3
    0%
  • 4
    0%
  • 5
    0%