Selective catalytic reduction of NOx to nitrogen over Co-Pt/ZSM-5

SCR of NOx by C3H6: comparison between Cu/Cr/CeO2 and Cu/Ag/CeO2 catalysts

“…It has been widely proposed that the roles of O 2 in the NO x reduction using the SCR-HC method are: (i) to activate NO and hydrocarbons [47,58]; (ii) to maintain a Cu + /Cu 2+ site balance [50,59]; (iii) to oxidize NO to NO 2 [56,60]; and (iv) to react with carbonaceous deposits [61]. Although no general agreement can be found in the proposed mechanisms involving O 2 , Martínez-Arias et al [47] have elucidated that the formation of oxidized intermediates (C x H y O z for the hydrocarbons and surface NO x species for NO) originated from the activation of hydrocarbons and NO x by O 2 generally happens over a catalyst which gains very low selectivity of N 2 O or nearly extinct.…”

Evaluation of NOx Removal from Flue Gas by a Chemical Absorption–Biological Reduction Integrated System: Glucose Consumption and Utilization Pathways

“…4 It is very difficult to remove NO with conventional wet flue gas desulfurization (FGD) because of its low solubility in aqueous solution. 5 Thus, several technologies, including selective catalytic reduction (SCR), selective non-catalytic reduction (SNCR), and other combined chemical and biological approaches, have been proposed for NO removal. 5−8 Among these approaches, SCR with NH 3 as a reductant has been widely used for NO x removal from stationary sources.…”

Selective catalytic reduction of NO over M–Ag/ZSM-5 bimetallic nanocatalysts (M = Mn, Fe and Ni). Physicochemical properties and catalytic performance

“…Accordingly, for Ag/ZSM 5 catalysts low selectivity to N 2 in NH 3 SCR of NO was observed and significant amounts of N 2 O were recorded in the products. Maisuls et al [22] studied selective catalytic reduction of NO x to N 2 over Co-Pt/ZSM 5 catalysts and concluded that Pt based cat alysts are very active and durable, however with increasing Pt concentration they yield large amounts of N 2 O.…”