Hybrid catalysts for the selective catalytic reduction (SCR) of NO by NH3: Precipitates and physical mixtures

Promotional effect of acidic oxide on catalytic activity and N2 selectivity over CeO2 for selective catalytic reduction of NOx by NH3

“…It was obvious that the introduction of ZrO 2 or WO 3 into CeO 2 could improve the reaction rate, and CeO 2 ‐WO 3 showed the best catalytic performance. From the SCR activity results, CeO 2 ‐ZrO 2 and CeO 2 ‐WO 3 showed the excellent catalytic activity compared with CeO 2 , which indicated that the superior SCR performance of CeO 2 ‐ZrO 2 and CeO 2 ‐WO 3 was in part attributed to the favorable pore microstructure …”

“…It was obvious that the intensity of NH 3 ‐desorption peak over CeO 2 ‐ZrO 2 was higher than that of CeO 2 , especially for the high temperature, which indicated that CeO 2 ‐ZrO 2 possessed the amounts of surface acid sites and it showed more medium and strong acid sites. It was reported that the surface acidity could improve the adsorption capacity of NH 3 , and then promoted the catalytic activity . In order to investigate the amounts of acid sites, the NH 3 ‐TPD profiles were operated by Gaussian curve fitting.…”

Enhanced Catalytic Performance of Hierarchical MnOx/ZSM-5 Catalyst for the Low-Temperature NH3-SCR

“…Selective catalytic reduction of NO x by NH 3 (NH 3 -SCR) is the most widely applied technology to remove NO x from stationary sources. The catalyst is the key factor that can determine the efficiency of the selective catalytic reduction system [1]. The temperature window of traditional commercial catalyst (V 2 O 5 -WO 3 (MoO 3 )/TiO 2 ) is 300-400 • C, and low-temperature NH 3 -SCR catalysts, which can be placed downstream of the desulfurizer and electrostatic precipitator, have attracted increasing attention in recent years [2].…”

NO Removal by Plasma-Enhanced NH3-SCR Using Methane as an Assistant Reduction Agent at Low Temperature

“…Selective catalytic reduction (SCR) is regarded as a practical method for the removal of NOx, which is highly efficient and environmentally friendly compared to other denitration methods. However, promising catalysts for NO X reduction, such as Ag/Al 2 O 3 [5][6][7][8][9][10][11][12][13] and Ce/Fe-ZSM-5 [14][15][16][17][18], have sufficient activity when the temperature exceeds 673 K. The V 2 O 5 -WO 3 /TiO 2 [19][20][21][22][23][24][25][26][27] catalyst can achieve superior activity only when the temperature is between 573 K and 673 K. A high reaction temperature leads to expensive energy consumption and other problems [28,29]. Therefore, low temperature SCR has attracted much attention [30][31][32].…”