LNT/CDPF catalysts for simultaneous removal of NOx and PM from diesel vehicle exhaust

Physicochemical characteristics according to aging of Fe-zeolite and V2O5–WO3–TiO2 SCR for diesel engines

“…Fe-zeolite (2) has the largest NH 3 desorption capacity, while that of the V 2 O 5 -WO 3 -TiO 2 SCR is relatively small. The concentration of desorbed NH 3 at approximately 225 8C is highest in Fezeolite (2). We guess that NH 3 is desorbed after experiencing low-intensity van der Waals forces, which involve no electron transfer between NH 3 and the acid sites of the SCR catalysts.…”

“…The purpose of this study is to investigate the physicochemical characteristics according to aging of Fe-zeolite (1) and (2) and V 2 O 5 -WO 3 -TiO 2 SCR catalysts which are appropriate for diesel engines.…”

“…Taking diesel combustion characteristics into consideration, NOx emitted from diesel engines is mostly produced in the localized high-temperature reaction zone, and PM (particulate matter) in diffusion combustion zones. Recent research into NOx reduction includes studies on LNT (lean NOx trap) [1][2][3][4], SCR (selective catalytic reduction) [5][6][7][8][9][10], and combined system of LNT and SCR for after-treatment systems.…”

NOx Removal from Air through Super Hydrophobic Hollow Fiber Membrane Contactors

“…Nitrogen oxides (NOx), besides CO2, are key pollutants in the flue gas emitted from the fossil fuel combustion process, and are very hazardous, having harmful effects on the human and global environment, such as damage to the ozone layer, greenhouse effects, formation of acid rain and photochemical smog (Wang et al, 2012;Wang et al, 2014;Zhang et al, 2014;Bueno-López et al, 2016;Ahmad et al, 2017;Yu et al, 2017;Cheng et al, 2018;Nimcharoen et al, 2018). Diesel engines are among the main contributors of NOx emissions into the atmosphere (Zhu et al, 2008;Choi & Lee, 2014;Cheng et al, 2018). Demand for diesel-engined vehicles is steadily growing due to an increase in their fuel consumption efficiency of 2030% over gasoline vehicles (Li et al, 2009;Choi & Lee, 2014).…”

“…Diesel engines are among the main contributors of NOx emissions into the atmosphere (Zhu et al, 2008;Choi & Lee, 2014;Cheng et al, 2018). Demand for diesel-engined vehicles is steadily growing due to an increase in their fuel consumption efficiency of 2030% over gasoline vehicles (Li et al, 2009;Choi & Lee, 2014). However, around 80% of the NOx emitted is from such vehicles (Zouzelka & Rathousky, 2017).…”