Kim, Geo Jong Kwon, Dong Wook Shin, Jung Hun Kim, Ki Wang Hong, Sung Chang 2024-01-19T19:32:03Z 2024-01-19T19:32:03Z 2021-09-05 2019-08 0959-3330 https://pubs.kist.re.kr/handle/201004/119706 In this work, the effect of the addition of vanadium to the Pt/TiO2 catalyst on the selective catalytic oxidation (SCO) of NH3 to N-2 was investigated. It was found that the addition of vanadium significantly enhanced catalytic activity at all tested temperatures. The Pt/V/TiO2 catalyst exhibited the highest NH3 conversion (similar to 100%) and NH3 to N-2 conversion (similar to 81%) at 250 degrees C. The physicochemical characteristics of the catalysts were investigated via Brunauer-Emmett-Teller (BET) analysis, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), NH3 temperature-programmed desorption (TPD), NH3 temperature-programmed oxidation (TPO), and in situ Fourier-transform infrared (FTIR) spectroscopy. It was found that the addition of V to the catalyst enhanced the conversion of NH3 as a result of the formation of new acid sites. The increase in the number of acid sites resulted in increased NH3 to N-2 conversion via the internal selective catalytic reduction (i-SCR) mechanism. This mechanism involves the SCR of NOx, which are formed by the oxidation of NH3. Based on experimental results and analyses of the catalysts modified by the addition of V, it was shown that there was a close relation between reaction selectivity and the surface oxygen species of the catalyst and N-2 yield. Furthermore, the addition of V increased the durability of SO2 by inhibiting the formation of ammonium bisulfate (ABS). [GRAPHICS] English TAYLOR & FRANCIS LTD TEMPERATURE AMMONIA OXIDATION REDUCTION NOX SO2 PERFORMANCE DEACTIVATION REACTIVITY RESISTANCE MECHANISM NITROGEN Influence of the addition of vanadium to Pt/TiO2 catalyst on the selective catalytic oxidation of NH3 to N-2 Article 10.1080/09593330.2018.1554004 1 ENVIRONMENTAL TECHNOLOGY, v.40, no.19, pp.2588 - 2600 ENVIRONMENTAL TECHNOLOGY 40 19 2588 2600 scie scopus 000501810600013 2-s2.0-85058680133 Environmental Sciences Environmental Sciences & Ecology Article TEMPERATURE AMMONIA OXIDATION REDUCTION NOX SO2 PERFORMANCE DEACTIVATION REACTIVITY RESISTANCE MECHANISM NITROGEN Vanadium Pt/TiO2 selective catalytic oxidation i-SCR NH3