Selective Catalytic Reduction of Nitric Oxide with Propylene over Fe/Beta Catalysts Under Lean-Burn Conditions

Abstract

Fe/Beta catalysts were used for the selective catalytic reduction of nitric oxide with propylene (C3H6-SCR) under lean-burn conditions, which were prepared by liquid ion-exchange (LIE), solid-state ion-exchange (SIE), and incipient wet-impregnation (IWI) methods. The iron species on Fe/Beta were characterized and identified by a combination of several characterization techniques. The results showed preparation methods had a significant influence on the composition and distribution of iron species, LIE method inclined to produce more isolated Fe3+ ions at ion-exchanged sites than IWI and SIE method. C3H6-SCR activity tests demonstrated Fe/Beta(LIE) possessed remarkable catalytic activity and N2 selectivity at temperature 300–450 °C. Kinetic studies of C3H6-SCR reaction suggested that isolated Fe3+ species were more active for NO reduction, whereas Fe2O3 nanoparticles enhanced the hydrocarbon combustion in excess of oxygen. According to the results of in situ DRIFTS, more isolated Fe3+ sites on Fe/Beta(LIE) would promote the formation of the key intermediates, i.e., NO2 adspecies and formate species, then led to the superior C3H6-SCR activity. The slight decrease of SCR activity after hydrothermal aging of Fe/Beta(LIE) catalyst might be due to the migration of isolated Fe3+ ions into oligomeric clusters and/or Fe2O3 nanoparticles.

Selective Catalytic Reduction of NOx by CO over Doubly Promoted MeMo/Nb2O5 Catalysts (Me = Pt, Ni, or Co)

“…The future development of the technologies for the abatement of gases from combustion of fossil fuels and diesel engines will require efficient routes for the conversion of these polluting gases into useful chemicals [1][2][3]. In this respect, selective catalytic reduction of hydrocarbons (SCR) has been recently claimed to be an extremely promising technology to eliminate exhaust gases [1,4].…”

“…The future development of the technologies for the abatement of gases from combustion of fossil fuels and diesel engines will require efficient routes for the conversion of these polluting gases into useful chemicals [1][2][3]. In this respect, selective catalytic reduction of hydrocarbons (SCR) has been recently claimed to be an extremely promising technology to eliminate exhaust gases [1,4]. This approach results in the reduction of the gases' release into the atmosphere, especially nitrogen oxides (NO x ), carbon oxides (CO x ), particulate matter (PM), volatile organic compounds (VOC) and sulfur oxides (SO x ) emissions [5][6][7].…”

Waste to energy conversion for a sustainable future

“…Many other researchers have published their results on the reduction of CO and NOx pollution by using biodiesel and biogas fuels ( EL-Seesy et al., 2018 ; Lenin et al., 2013 ; McClements and Gumus, 2016 ; Mehta et al., 2014 ; Venu and Madhavan, 2016 ). Some researchers advocated for the reduction of NO and NO 2 from the industries and automobiles to reduce ozone in the troposphere ( Chen et al., 2019 ; Itaya et al., 2019 ; Kato et al., 2019 ; Zhou et al., 2019 ). Catalytic reduction of GHG gases from vehicles will mature by 2030.…”

The correlation between the iodine value of coconut shell carbon and their reaction performance for NO2 to NO

“…Nitrogen oxides (NO x ) can form environmental problems such as photochemical smog, acid rain and ozone layer depletion, which seriously affect human health. 1,2 Global NO x emissions can reach ≤5000 tons year −1 , resulting in severe pollution. 3 The chemiluminescence method of converting nitrogen dioxide (NO 2 ) to nitric oxide (NO) through a molybdenum furnace is currently the mainstream NO x detection method.…”