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Received March 14, 2022
Accepted May 18, 2022
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The effect of CNTs on V-Ce/TiO2 for low-temperature selective catalytic reduction of NO
Jae-Rang Youn1 2
Min-Jae Kim1 3
Seung-Jae Lee2
In-Soo Ryu2
Soon Kwan Jeong2
Kyubock Lee1 3†
Sang Goo Jeon2†
1Graduate School of Energy Science and Technology, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Korea 2Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 34129, Korea 3, Korea
Korean Journal of Chemical Engineering, September 2022, 39(9), 2334-2344(11), 10.1007/s11814-022-1182-4
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Abstract
Carbon nanotubes (CNTs) are widely utilized as catalyst promoters because of their unique structure and electrical properties. In this study, CNTs were added as a promoter to V-Ce/TiO2 (VCT), which is a commercial catalyst used for the NH3-SCR reaction. We investigated the role of CNTs in the V-Ce/TiO2-CNTs (VCTC) catalyst. Therefore, we characterized them using X-ray diffraction (XRD), N2 adsorption/desorption experiments, thermogravimetric analysis (TGA), transmission electron microscopy (TEM), temperature-programmed reduction of H2 (H2-TPR), temperature- programmed desorption of NO/NH3 (NO/NH3-TPD), X-ray photoelectron spectroscopy (XPS), and in situ Fourier transform infrared spectroscopy (FT-IR). Higher NO conversion and N2 selectivity were achieved in the VCTC catalyst than in the VCT catalyst, confirming the favorable effect of CNTs on the NH3-SCR reaction. Additionally, CNTs considerably influenced the crystal structure formation of the metal oxides located on the catalyst surface. Consequently, metal-metal and metal-support undergo distinct interactions, thereby positively influencing catalytic characteristics such as redox properties, oxidation state, acid sites, and the formation of nitrate species.
Keywords
References
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