Kim, Jongsik Kim, Dong Ho Kwon, Dong Wook Ha, Heon Phil 2024-01-19T21:32:40Z 2024-01-19T21:32:40Z 2021-09-05 2018-10-21 2044-4753 https://pubs.kist.re.kr/handle/201004/120778 FeVO4 (Fe-1) is a particular class of metal vanadate that has recently been highly profiled as an active site to selectively reduce NOX with NH3 (NH3-SCR). This primarily results from NOX/NH3-accessible VO43- anions and an electronic inductive effect between the Fe and V species, leading to the formation of abundant catalytic defects available for NOX turnover. Motivated by a structural inspection of the vanadates reported to date, this study detailed the use of Fe2V4O13 (Fe-2) as a novel active site deposited on anatase (TiO2) for NH3-SCR. While providing the aforementioned structural benefits, Fe-2/TiO2 also enhanced the redox character as well as the number of sites accessible to NOX/NH3 over Fe-1/TiO2 because of the greater electronic inductive effect of Fe-2. Therefore, Fe-2/TiO2 converted NOX better than Fe-1/TiO2 in the presence of H2O. To further improve the NH3-SCR performance of Fe-2/TiO2, its catalytic surface was modified via two steps. The first step was to incorporate 1.9 wt% Sb into Fe-2/TiO2. Sb could promote the redox feature of Fe-2/TiO2 and help its surface to preferentially interact with NH3/NOX, thereby making the resulting Fe-2-Sb-1.9/TiO2 outperform Fe-2/TiO2 during NH3-SCR in the presence of H2O. The second step was to functionalize the Fe-2-Sb-1.9/TiO2 surface with SO32-/SO42- species. The resulting Fe-2-Sb-1.9/TiO2 (S) was validated to further increase redox cycling of Fe-2-Sb-1.9/TiO2, favor NO2 production from NO oxidation for fast NH3-SCR, and hamper surface interplay with SO2. Fe-2-Sb-1.9/TiO2 (S), therefore, showed higher NOX conversions than a control simulating a commercial catalyst during NH3-SCR feeding H2O and SO2. Fe-2-Sb-1.9/TiO2 (S) also showed greater durability than the control because of its enhanced resistance to SO2, ammonium (bi)sulfates, and alkali metals. English ROYAL SOC CHEMISTRY AMMONIUM BISULFATE FORMATION VANADIUM-OXIDE CATALYSTS LOW-TEMPERATURE SCR VANADATE CATALYSTS PERFORMANCE V2O5/TIO2 MECHANISM CERIA DECOMPOSITION RESISTANCE Rational selection of Fe2V4O13 over FeVO4 as a preferred active site on Sb-promoted TiO2 for catalytic NOX reduction with NH3 Article 10.1039/c8cy01304g 1 CATALYSIS SCIENCE & TECHNOLOGY, v.8, no.18, pp.4774 - 4787 CATALYSIS SCIENCE & TECHNOLOGY 8 18 4774 4787 scie scopus 000448144600023 2-s2.0-85053938834 Chemistry, Physical Chemistry Article AMMONIUM BISULFATE FORMATION VANADIUM-OXIDE CATALYSTS LOW-TEMPERATURE SCR VANADATE CATALYSTS PERFORMANCE V2O5/TIO2 MECHANISM CERIA DECOMPOSITION RESISTANCE