Hydrogen assisted urea-SCR and NH3-SCR with silver–alumina as highly active and SO2-tolerant de-NOx catalysis
Hydrogen assisted urea-SCR and NH3-SCR with silver–alumina as highly active and SO2-tolerant de-NOx catalysis
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DOI：
10.1016/j.apcatb.2007.07.021
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发表时间：
2007-11
影响因子：
22.1
通讯作者：
K. Shimizu;A. Satsuma
中科院分区：
文献类型：
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作者：
K. Shimizu;A. Satsuma
在尿素选择性催化还原NO（urea-SCR）反应中，添加0.5%H2可显著提高Ag/Al 2 O3催化剂的NO还原活性。其中Ag/Al 2 O3催化剂的活性最高，在200-500°C的温度范围内，GHSV为75, 000 h-1时，NO转化率高达84%以上，且无N2 O生成。在250°C、10%H2O和50 ppm SO2、GHSV为380，000 h-1的条件下进行H2辅助的尿素-SCR反应24 h后，Ag/Al 2 O3上的NO转化率从48%下降到30%，但在尿素-SCR条件下将失活的催化剂在500°C加热1 h后恢复了原始活性。该催化剂在200°C下在H2辅助的NH3-SCR中也显示出高的SO2耐受性。
Addition of 0.5% H2in the selective catalytic reduction of NO by urea (urea-SCR) caused a drastic improvement of NO reduction activity of Ag/Al2O3. Among various silver-based catalysts Ag/Al2O3showed highest activity for H2assisted urea-SCR, and high NO conversion (above 84%) and no formation of N2O were achieved over wide temperature range (200–500°C) at GHSV of 75,000h−1. After H2assisted urea-SCR at 250°C with 10% H2O and 50ppm SO2under GHSV of 380,000h−1for 24h, NO conversion over Ag/Al2O3decreased from 48 to 30%, though original activity was recovered when the deactivated catalyst was heated at 500°C in the urea-SCR condition for 1h. The catalyst also showed high SO2-tolerance in H2assisted NH3-SCR at 200°C.