Non-thermal plasma enhanced NSR performance over Pt/M/Ba/Al2O3 (M = Mn, Co, Cu) catalysts

Abstract

Non-thermal plasma enhanced NSR performance over Pt/M/Ba/Al 2 O 3 (M = Mn, Co, Cu) catalysts, Chemical Engineering Journal (2016), doi: http://dx. AbstractTo improve the NO x storage capacity (NSC) of lean NO x trap (LNT) catalysts of the Pt/BaO/Al 2 O 3 type, the catalyst was doped with redox active transition metals of Mn, Co, or Cu, respectively. Due to differences in the chemical states of the doped metals, the catalysts exhibited different catalytic behaviors. Co and Mn doped catalysts showed improved NO to NO 2 oxidation ability, and therefore enhanced NO x storage capacities, which led to the increased cycle averaged NO x conversions as compared to a Pt/Ba/Al 2 O 3 reference. However, being limited by NO x reduction in rich phase, the NO x conversions were still poor at low temperatures (<250 o C). By employing an H 2 -plasma in rich phase to assist NO x reduction, NO x conversions were greatly enhanced especially for low temperatures (≤250 o C). The best properties were achieved over Pt/Co/Ba/Al 2 O 3 catalyst which exhibited NO x conversions higher than 80% in the whole temperature range (150 to 350 o C) and best SO 2 resistance abilities.

Synergy between β-Mo2C Nanorods and Non-thermal Plasma for Selective CO2 Reduction to CO

“…33 H 2 is activated by electron impact and vibrational excitation and then dissociates into H atoms. 34 H atoms react with the surface oxygen originated from CO 2 dissociation to form water and regenerate the catalyst, which can be described as follows:…”

High-Throughput NOx Removal by Two-Stage Plasma Honeycomb Monolith Catalyst

“…Hydrocarbon selective catalytic reduction (HC-SCR) has been successfully used for NO x removal within a narrow temperature window (250–350 °C). − The use of non-thermal plasma in conjunction with a catalyst has been proposed to expand the temperature window with the view of lowering the temperature. − This comes from a plasma state consisting of energetic electrons, excited species, radicals, and ions. Indeed, energetic electrons produced by dielectric barrier discharge (DBD) plasma have energies in the range of 1–10 eV .…”

Addition of Pd on La0.7Sr0.3CoO3 Perovskite To Enhance Catalytic Removal of NOx

“…Three-way catalysts (TWC) cannot meet the increasingly strict exhaust regulation of NO x for lean-burn engines, where excessive oxygen is fed into the engine to improve the energy efficiency and reduce CO 2 emissions. , Among feasible alternative methods, lean NO x traps, which are also called NO x storage and reduction (NSR), is presently an attractive technique for removal of NO x emitted from lean-burn engines. − The mechanism over LNT catalysts can be briefly described as follows: in a long lean-burn period, the reaction process commonly involves the oxidation of NO to NO 2 and then the formation of nitrate or nitrite. , In a subsequent short fuel-rich period, the trapped NO x is desorbed and then reduced with assistance of reductants. , The cyclic operations between the above-mentioned two phases realize the reduction of toxic NO x .…”