Boosting low temperature De-NOx performance and SO2 resistance over Ce-doped two dimensional Mn-Cr layered double oxide catalyst

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

“…In particular, it was noted that the intensities of the physically adsorbed NH 3 (1780–3100 cm –1 ) decreased, which was attributed to the loss of specific surface area as shown in Table S3. Nevertheless, the MnO x -SiO 2 -Pb catalyst still maintained a relatively high specific surface area (169.59 m 2 /g) compared to that of the MnO x -Pb catalyst (10.06 m 2 /g), enabling the adsorption of more physically adsorbed NH 3 , which can be promptly replenished when the NH 3 species at active sites was consumed …”

“…Nevertheless, the MnOx-SiO 2 -Pb catalyst still maintained a relatively high specific surface area (169.59 m 2 /g) compared to that of the MnOx-Pb catalyst (10.06 m 2 /g), enabling the adsorption of more physically adsorbed NH 3 , which can be promptly replenished when the NH 3 species at active sites was consumed. 22 3.2.2. Adsorption of Nitrate Species.…”

Rationally Designed Confined Structure Ce-Mn-TNTs Catalyst for Low-Temperature NH3-SCR Reaction with Superior Activity and H2O/SO2 Tolerance

“…According to previous studies, the mass loss in the first stage was mainly due the desorption of water physically adsorbed when the temperature was below 200 °C. 47,48 Ammonium sulfate and ammonia bisulfate were decomposed at 230 and 350 °C, 17,49,50 respectively. As a result, the mass loss corresponded to the decomposition of (NH 4 ) 2 SO 4 and NH 4 HSO 4 in the second stage (200−400 °C).…”

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

“…Fossil fuel burning produces nitrogen oxides (NO x ), which are detrimental to the environment and human health. 1,2 An efficient method of lowering NO x emissions is a selective catalytic reduction of NO with NH 3 (NH 3 -SCR) technology. 3,4 In NH 3 -SCR, the commercial V 2 O 5 /WO 3 -TiO 2 catalyst is frequently employed.…”

“…22 Therefore, it is highly feasible that SO 2 can be used to modify CeO 2 catalysts to improve catalytic performance. However, during sulfation, there are different paths to the oxidation of SO 2 and the process of SO 2 oxidation on CeO 2 to form sulfate is divided into the following two cases: (1) when oxygen is presented, [23][24][25][26][27] 2CeO 2 + O 2 + 3SO 2 -Ce 2 (SO 4 ) 3 ; (2) when there is no oxygen it is 6CeO 2 + 3SO 2 -Ce 2 (SO 4 ) 3 + 2Ce 2 O 3 . When O 2 is not present, SO 2 is oxidized by the lattice oxygen in CeO 2 to form sulfate.…”