Characterization of Pt-impregnated MCM-41 and MCM-48 and their catalytic performances in selective catalytic reduction for NOx

Low-Temperature Performance of Pt/TiO2 for Selective Catalytic Reduction of Low Concentration NO by C3H6

“…As shown in Figure a, the catalysts with 1 and 2 wt % Pt loading achieved maximum NO x conversions of 47.5 and 49.3% at 180 °C, respectively. Considering the correlations between Pt loading amount and NO x removal efficiency, the intermediate Pt loading of 0.5% is the optimum amount for NO x reduction, which is similar to previous studies. ,, Previous investigation suggests that Pt species (Pt, PtO x ) act as the adsorption sites for reactant and the active sites for surface reaction during the SCR process. − The number of active sites available for NO x reduction increased with the increase of the Pt loading, but there was an optimum Pt loading amount (0.5% Pt), at which the number of active sites just meet the needs of NO x SCR reaction. In other words, the Pt content of 0.5% was enough to activate the SCR reaction, while weakening the direct combustion of C 3 H 6 with O 2 .…”

Ru-based monolithic catalysts for the catalytic oxidation of chlorinated volatile organic compounds

“…4 , the peak that appears at a high temperature range of about 350–450 °C can be observed over Ru/TiO 2 and Ru/P25 catalyst, and corresponds to the strong acid sites. 50 In addition, the intensity of NH 3 desorption peak of Ru/TiO 2 catalyst is higher than those of Ru/P25, Ru/Si-beta and Ru/CeO 2 catalysts, indicating Ru/TiO 2 catalyst has abundant acid sites on its surface between 100 and 500 °C. Previous studies shows that the catalysts with abundant acid sites is beneficial for the adsorption of Cl and the cleavage of C–Cl bonds during the DCM catalytic oxidation process.…”

Effect of the Addition of In to Co/HMCM-49 Catalyst for the Selective Catalytic Reduction of NO Under Lean-burn Conditions

“…Zeolite-type catalysts showed excellent catalytic properties in HC-SCR due to their unique pore-channel structure and ion exchangeability. A series of MCM zeolite with high surface area, high thermal stability and big pore volume, have attracted considerable interest for the application as a catalyst or catalyst support [20][21][22][23][24] in the HC-SCR. MCM-49, a new member of this series of zeolite, was discovered by Bennett et al [25].…”