Promotional effect of H2 on the selective catalytic reduction of NOx with propene over a metal-monolithic anodic alumina supported Ag catalyst
The effect of H2 on the selective reduction of Nox with propene over a novel metal-monolithic anodic alumina supported Ag catalyst (Ag/Al2O3/Al) was investigated under lean-exhaust conditions. The de-Nox activity in the low temperature region (< 673 K) was markedly increased by adding a small amount of H2. Since Nox was reduced little by H2 in the absence of propene, H2 should act as a promoter of Nox reduction with hydrocarbons. Upon the removal of H2 from reaction gases, NO reduction activity decreased to the same conversion before the addition of H2, indicating that the promotion effect of H2 on NO reduction activity was reversible. Adding H2 in the feed stream promoted the decomposition of ads-Nox (nitrate species) in the low temperature region to free part of silver sites. The possible reason for the promotional effect by H2 on the C3H6-SCR of NO was associated with the formation of Agn δ + (2 ≤n ≤4) cluster, which had the higher ability of C3H6 partial oxidation than Ag + ions and higher selectivity than to Agm (3 ≤m ≤5) clusters and Ag metal.
Selective catalytic reduction Nitric oxide Hydrogen Anodic alumina support Silver
Yu GUO Lu ZHOU Hayato TSUCHIYA Qi ZHANG Thanh Phong TRAN Makoto SAKURAI Hideo KAMEYAMA
Department of Chemical Engineering, Tokyo University of Agriculture and Technology, 24-16, Nakacho 2,Koganei-shi, Tokyo 184-8588, Japan
国际会议
第四届中日化工学术研讨会(The 4th Joint China/Japan Chemical Engineering Symposium)(CJCES)
成都
英文
2007-12-19（万方平台首次上网日期，不代表论文的发表时间）