Kim, Jongsik Kim, Dong Ho Ha, Heon Phil 2024-01-19T16:31:31Z 2024-01-19T16:31:31Z 2021-09-02 2020-10-05 0304-3894 https://pubs.kist.re.kr/handle/201004/118004 Catalysts are severely poisoned by ammonium sulfate (AS) and ammonium bisulfate (ABS) during selective catalytic NOx reduction (SCR) at low temperatures. To circumvent this issue, metal-substituted vanadates (MV2O6, M = Mn, Co, Ni, or Cu) supported on TiO2 were synthesized and functionalized with SOY2- to form M-1 (S) catalysts (Y = 3 or 4). The Mn-1 (S) could balance pre-factor and energy barrier required for the SCR, thereby exhibiting the highest NOx consumption rate (activity) among the M-1 (S) catalysts. The Mn-1 (S) also had desirable redox property, leading to the best SCR performance maximum-obtainable at low temperatures. Notably, the Mn-1 (S) substantially reduced the thermal energy needed to decompose AS/ABS poisons. Such unique feature of the Mn-1 (S) was pronounced when the Mn-1 (S) was promoted by Sb (Mn-1-Sb (S)). The resulting Mn-1-Sb (S) showed the best SCR performance among all catalysts tested. The Mn-1-Sb (S) could minimize the deposition of AS/ABS on the surface and unprecedentedly recovered its performance after regeneration even in the presence of NOx, NH3, SO2, and H2O at 260 - 280 degrees C. The temperatures required for the regeneration of the Mn-1-Sb (S) were reduced by 100 degrees C or more in comparison with those of SCR catalysts reported previously. English ELSEVIER NITRIC-OXIDE MNOX/TIO2 CATALYST ACTIVE-SITES SCR AMMONIA SO2 NH3 MECHANISM KINETICS NH3-SCR Investigating multi-functional traits of metal-substituted vanadate catalysts in expediting NOx reduction and poison degradation at low temperatures Article 10.1016/j.jhazmat.2020.122671 1 JOURNAL OF HAZARDOUS MATERIALS, v.397 JOURNAL OF HAZARDOUS MATERIALS 397 scie scopus 000541927100015 2-s2.0-85084518958 Engineering, Environmental Environmental Sciences Engineering Environmental Sciences & Ecology Article NITRIC-OXIDE MNOX/TIO2 CATALYST ACTIVE-SITES SCR AMMONIA SO2 NH3 MECHANISM KINETICS NH3-SCR Selective catalytic NOx reduction Metal vanadate Kinetics Ammonium (bi)sulfate Poison degradation Regeneration