Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 397, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.122671
Keywords
Selective catalytic NOx reduction; Metal vanadate; Kinetics; Ammonium (bi)sulfate; Poison degradation; Regeneration
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Funding
- National Research Foundation of South Korea [NRF-2017M3D1A104069021]
- Korea Institute of Science and Technology (KIST) [2E30550, 2E30710]
- Ministry of Science and ICT
- National Research Foundation of Korea [2E30111] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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