The combination effects of K2O and PbO poisoning on NH3-SCR TiO2-CeO2 catalyst

Modulating active oxygen species on α-MnO2 with K and Pb for SCR of NO at low temperatures

“…Some previous studies have reported the deactivation of strong acidic sites by alkali metal species. 30,31 However, our findings were different. The reason could be Catalysis Science & Technology Paper that K was stored in the tunnels of MnO 2 and did not occupy the adsorption sites on the surface.…”

Effect of SO2 introduction into CeO2 on its surface acidity and redox property for the selective catalytic reduction of NO with NH3

“…Normally, NH 3 adsorption at 100–150 °C was regarded as weak acid sites adsorption, NH 3 adsorption at 150–300 °C was considered to be medium acid sites adsorption, and NH 3 adsorption over 300 °C was deemed strong acid sites adsorption. 35,66,67 As shown in Fig. 7(a), the conspicuous NH 3 desorption peak for Ce and H–Ce occurred before 200 °C, while a broad weak peak appeared at roughly 300 °C.…”

“…All catalysts showed the same pattern of diffraction peaks, which were assigned to the fluorite cubic structure of CeO 2 . [33][34][35] The distinctive XRD diffraction peaks of sulfate were not tracked in the S-Ce and H-S-Ce catalysts, showing that sulfate was highly dispersed upon the S-Ce and H-S-Ce catalysts via the SO 2 gas. In addition, Table 1 shows the average grain size of the catalysts obtained from XRD, which reflected that the effect of sulfation on the grain size of the catalysts could be neglected.…”

Design Strategy of the MnOx Catalyst for SCR of NO with NH3: Mechanism of Lead Poisoning and Improvement Method

“…It is well known that combustion gases from waste incineration plants always contain toxic substances such as heavy metals (Pb, Cd, and Cr), alkali metal (Na and K), and SO 2 , which can lead to serious catalyst deactivation . Previous research showed that the adverse effect of Pb on the activity of manganese-based catalysts is greater than that of most of the other components.…”