Autocatalytic synergism observed during lean-NO reduction with a bifunctional reductant over Ag/Al2O3 catalyst

Insight into the Mechanism of Selective Catalytic Reduction of NOx by Propene over the Cu/Ti0.7Zr0.3O2 Catalyst by Fourier Transform Infrared Spectroscopy and Density Functional Theory Calculations

“…Owning to the high fuel efficiency and low emission of CO 2 , diesel engines have been widely considered as the future for transport and remote power generation. 1,2 However, the abatement of NO x in lean-burn engine exhausts, which leads to the formation of acid rain and photochemical smog, remains a major challenge. As a potential alternative, the selective catalytic reduction of NO x by hydrocarbon (HC-SCR) has proven to be an effective and economical technique for the removal of NO x originating from mobile sources, which can eliminate NO x and unburnt hydrocarbons simultaneously.…”

“…Owning to the high fuel efficiency and low emission of CO 2 , diesel engines have been widely considered as the future for transport and remote power generation. , However, the abatement of NO x in lean-burn engine exhausts, which leads to the formation of acid rain and photochemical smog, remains a major challenge. As a potential alternative, the selective catalytic reduction of NO x by hydrocarbon (HC-SCR) has proven to be an effective and economical technique for the removal of NO x originating from mobile sources, which can eliminate NO x and unburnt hydrocarbons simultaneously. − C 3 H 6 -SCR under lean-burn conditions has attracted a great deal of attention during the past few decades, although its current performance is not sufficient for commercial application, especially its low-temperature performance. ,,, By considering the efficacy and cost, copper-based catalysts have been explored widely to obtain more appropriate catalysts to elevate the low-temperature performance of the C 3 H 6 -SCR reaction. , We have synthesized the Cu/Ti 0.7 Zr 0.3 O 2 catalyst successfully in a recent work, which exhibited excellent low-temperature SCR activity under lean-burn conditions compared to that of Cu/TiO 2 , while the mechanism for the activity promotion on this catalyst from the view of intermediates has not been clarified.…”

Effect of Ammonia on the Intermediates and Chemical Pathway of Selective Catalytic Reduction of NO by Ethanol over a Pt/Al2O3 Catalyst

“…The oxime is subsequently converted to amide by Beckman rearrangement. Amides can produce −NCO substances by dehydrogenation. , Yu et al also demonstrated that the addition of ammonia in ethanol-SCR can improve the conversion of NO x when 150 ppm of NH 3 was added at 300 °C. Moreover, this scholar pointed out by the results of in situ DRIFTS that NH 3 can react with enol substances on the catalyst surface to form −NCO substances (reaction ).…”

Catalytic Performance of MgO-Supported Co Catalyst for the Liquid Phase Oxidation of Cyclohexane with Molecular Oxygen

“…These results indicate that Co 3 O 4 supported on MgO is the main active component for the oxidation of cyclohexane, and 0.2%Co/MgO is an efficacious catalyst for cyclohexane oxidation using O 2 oxidant. The Co dispersion (D Co ) of the 0.2%Co/MgO was 7.5%, which was measured by the O 2 pulse chemisorption [39]. TOF (turnover frequency) of 0.2%Co/MgO was calculated to be 8.2 s −1 by TOF = ∆n -ane /(n Co × D Co ×T) (-ane denotes the cyclohexane; ∆n -ane -the converted cyclohexane (mol); n Co -the Co amount in the catalyst (moL); T-the reaction time (s)).…”