Activity enhancement of Ag/mordenite catalysts by addition of palladium for the removal of nitrogen oxides from diesel engine exhaust gas

Selective catalytic reduction of NOx over Ag/Al2O3 catalyst: from reaction mechanism to diesel engine test

“…He et al first reported at the 69th Annual Meeting of JCS [64] that the SCR of NO x by C 3 H 6 over an Ag/Al 2 O 3 catalyst was effectively enhanced by coimpregnating with a small amount of Pd, whereas it was reduced by the addition of Pt and Au. The effect of adding Pd on Ag/mordenite was also reported by Masuda et al [65] using (CH 3 ) 2 O as a reductant, although the durability of Ag/ Pd/mordenite decreased in the presence of water vapor. Seker et al [66] showed the negative effect of Au on Ag/ Al 2 O 3 for the NO xreduction with C 3 H 6 .…”

Novel Pd promoted Ag/Al2O3 catalyst for the selective reduction of NOx

“…The additive effect of Pd on Ag/mordenite was also reported by Masuda et al [16] using (CH 3 ) 2 O as a reductant although the durability of Ag/Pd/mordenite was decreased in the presence of water vapor. Seker et al [17] showed the negative effect of Au on Ag/Al 2 O 3 for the NO x reduction with C 3 H 6 .…”

Ag cluster as active species for SCR of NO by propane in the presence of hydrogen over Ag-MFI

“…Ag has attracted much attention since Miyadera reported a high activity of the SCR by ethanol over Ag/Al 2 O 3 [6]. Ag-containing zeolites are known as active catalysts above 673 K for SCR of NO by light hydrocarbons including CH 4 [4,5,[7][8][9][10][11]. In addition, for SCR of NO by (CH 3 ) 2 O, Ag-containing zeolites were active in the range of 498 to 723 K, but the activity of the catalysts was low [9,10].…”