High Catalytic Activity of Platinum-ZSM-5 Zeolite below 500 K in Water Vapor for Reduction of Nitrogen Monoxide

Abstract

Platinum ion-exchanged ZSM-5 zeolite efficiently reduced nitrogen monoxide to nitrogen by ethene in an oxidizing atmosphere below 500 K and the catalytic activity was not affected by the presence of 8.6 vol% water vapor.

Catalytic reduction of NO over in situ synthesized Ir/ZSM-5 monoliths

“…Among the noble metal-based catalysts, Pt-based catalysts have been regarded as the most active for NO reduction with hydrocarbons, and they have received much more attention than the other noble metal-based catalysts [8][9][10][11][12][13][14]. However, the narrow operation window and the rather high yield of N 2 O make it difficult to find practical use in diesel vehicles.…”

Pillared Clays as Superior Catalysts for Selective Catalytic Reduction of Nitric Oxide

“…Hamada et al [17] reported that the activity for SCR decreased significantly when alumina was replaced by silica as the support for Pt. Pt supported on ZSM-5 also showed SCR activity [ 33 ] . However, the Pt was doped on the exterior surface of the ZSM-5 crystals, and hence was not an effective support [ 34 ] .…”

“…A large number of catalysts have been found to be active for these reactions since 1990, such as Cu-ZSM-5 [3][4][5][6], Co-ZSM-5 and Co-Ferrierite [7][8][9], Co/Al2O3 [ 10 ] , Ce-ZSM-5 [11], Cu 2+ -exchanged pillared clay [12,13], Fe-ZSM-5 [ 14 ] , Pt-ZSM-5 [15 ] , Rh-ZSM-5 [16], Pt/Al2O3 [17][18][19], and supported Ag [ 20 ] . Although Cu-ZSM-5 is very active and the most intensively studied catalyst, it suffers from severe deactivation in engine tests, mainly due to H2O and SO2 [21,22].…”

Electron spin resonance and optical spectroscopic studies of Co-ZSM-5 with nitric oxide

“…Selective catalytic reduction (SCR) of nitric oxide with alkanes by various metal ion catalysts at temperatures above 300°C has received great attention because this may offer an effective way of removing nitric oxide [2]. A variety of ion-exchanged zeolites, including Cu [3,4], Fe [5], Pt [6], Co [7], Ga [8], Ce [9] and H [10] ions have been found to be active as catalysts for this reaction. ZSM-5 zeolites with ion-exchanged Cu(II) and Co(II) are the most intensively studied because of their high SCR activity.…”