Zeolite-supported precious metal catalysts for NOx reduction in lean burn engine exhaust

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.…”

“…Compared with Pt-based catalysts, Ir-based catalysts behave poor activities for the HC-SCR process [8,11]. However, after pretreatment with N 2 [15] or 10% H 2 O-N 2 [16] at high temperatures (1173 or 973 K), the Ir-based catalysts exhibited very high deNO x activities under oxidizing atmosphere when C 3 H 6 was used as reducing agent.…”

Combined effect of injection timing, EGR and injection pressure in reducing the NOxemission of a biodiesel blend

“…Retardation of fuel injection, exhaust gas recirculation (EGR), water injection and fuel additives are well-known techniques in NO x control through the modification of combustion process (Henein 1976). Treatment of exhaust gases were carried out with the help of catalysts to remove the NO x from the combustion products (Kummer 1979;Rosenberg et al 1980;Gilot, Guyon, and Stanmore 1997;Takami et al 1997). Catalysts were employed in the NO x control, where the emission standards cannot be met by in-cylinder control alone and the in-cylinder control method is the most economical method for NO x reduction (Sarofim and Flagan 1976) and the same is discussed in this article.…”

Multi Response Optimization of NOxEmission of a Stationary Diesel Engine Fuelled with Crude Rice Bran Oil Methyl Ester

“…NO x emission in a Diesel engine can be controlled either by modification of the combustion process or by the treatment of exhaust gases [14]. In the former method retardation of fuel injection timing, Exhaust Gas Recirculation (EGR), fuel additives and water injection techniques are employed to prevent the NO x formation [15] while the latter method was carried out with the help of different catalysts to remove NO x emission completely [16][17][18][19][20]. Of the two methods the combustion process modification is comparatively cheaper [14] and the same has been discussed in this work.…”