The effect of CNTs on V-Ce/TiO2 for low-temperature selective catalytic reduction of NO

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), N-2 adsorption/desorption experiments, thermogravimetric analysis (TGA), transmission electron microscopy (TEM), temperature-programmed reduction of H-2 (H-2-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 N-2 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.

Automated summary

CNTs as promoter added to VCT catalyst can enhance catalytic efficiency in NH3-SCR reaction, significantly influencing the crystal structure formation of metal oxides.