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Influence of support composition on enhancing the performance of Ce-V on TiO2 comprised tungsten-silica for NH3-SCR

Authors
Kwon, Dong WookLee, SominKim, JongsikLee, Kwan-YoungHa, Heon Phil
Issue Date
1-1월-2021
Publisher
ELSEVIER
Keywords
NH3-SCR; CeVO4; NOx removal; Hydrothermal
Citation
CATALYSIS TODAY, v.359, pp.112 - 123
Indexed
SCIE
SCOPUS
Journal Title
CATALYSIS TODAY
Volume
359
Start Page
112
End Page
123
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/50181
DOI
10.1016/j.cattod.2019.07.002
ISSN
0920-5861
Abstract
The roles of WO3 and SiO2 in Ce-V catalysts supported on TiO2 comprised tungsten-silica were investigated systematically for NH3-SCR (selective catalytic reduction) and NH3-oxidation at high temperatures. When SiO2 and WO3 were added to TiO2, the surface area of Ce-V/TWS was maximized and the formation of Ti-O-Si bond reduced nanoparticle size compared to without SiO2. The Ce-V/TWS surface had greater abundance of catalytic defects and surface oxygen species via XPS results. Increasing the (V4+ + V3+) fraction increased the catalytic activity, which is attributed to the enhanced SCR performance at a wide temperature range due to the addition of WO3 and SiO2 to TiO2. The catalysts using the TWS supports exhibit high catalytic activity, since WO3 and SiO2 can promote redox properties. It was shown that Ce-V/TWS was the most suitable catalyst for selectively producing N-2 via thermodynamically unavoidable NH3 direct oxidation as the temperature increased. In addition, hydrothermal aging effects were investigated for the Ce-V/TWS catalyst prepared by TiO2 supports including WO3 and SiO2 (comparison with vanadium-tungsten/titania). This study demonstrates the feasibility of utilizing WO3 and SiO2 in the TiO2 support as a possible way to increase catalytic activity and N-2 selectivity in NH3-SCR at high temperatures.
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공과대학 (화공생명공학과)
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