High performance of the morphologically controlled synthesis carrier of TiO2 for NH3 selective catalytic reduction of NO

• Published in: Materials chemistry and physics 2023-05, Vol.300, p.127492, Article 127492
• Main Authors: Mu, Guilin, Liu, Shuai, Liu, Qingjie, Liu, Shanshan, Zhang, Xintang
• Format: Article
• Language: English
• Subjects: Morphology; NH3 selective catalytic reduction (NH3-SCR); Ni-Ce/TiO2; Surface acidity
• ISSN: 0254-0584; 1879-3312
• DOI: 10.1016/j.matchemphys.2023.127492

TiO2 supported Ni and Ce with different morphologies (particle-like TiO2 (PT), flower-like TiO2 (FT), spherical-like TiO2 (ST), rod-like TiO2 (RT)) were prepared. Ni-Ce/flower-like TiO2 (NCFT) catalyst exhibits the best performance (NO conversion and N2 selectivity both approach to 100% approximately) in 250–450 °C and SO2 resistance (∼80%). The sequence of activities is NCFT > NCST > NCPT > NCRT. The FT carrier provides the largest specific surface area (145.9 m2 g−1), facilitating the dispersion of the active components. In addition, NCFT is abundant in Ni3+ and Ce3+ as well as Oα species, which support excellent redox properties. More weak acid and medium acid sites provided more adsorption sites for NH3-SCR reaction. This is also the main reason that NCFT catalyst has excellent denitrification activity. In-situ infrared results show that the reaction of NCFT catalyst is mainly through E-R mechanism, and NH3 (L) and -NH2 species formed on the catalyst surface were the main ammonia adsorption species and reaction species. Unfortunately, NCFT has not ideal sulfur resistance and stability due to its unique structure, which needs to be further improved. [Display omitted] •NCFT catalyst exhibits the best performance (100% NO conversion and N2 selectivity) between temperature 250–450 °C.•The sequence of activities is NCFT > NCST > NCPT > NCRT.•FT provides the largest specific surface area (145.9 m2 g−1), facilitating the dispersion of the active components.•More weak acid and medium acid sites provided more adsorption sites for NH3-SCR reaction.•The reaction of NCFT catalyst is mainly through E-R mechanism for NH3-SCR.