2021/12/17 by Yifeng Tan, Fan Li, Bing Zhao +2
Materials Science · Energy · Chemistry · #Catalytic Processes in Materials Science #Advanced Photocatalysis Techniques #Nanomaterials for catalytic reactions
paper · doi:10.1021/acs.langmuir.1c02597
A series of mesoporous CeZrTiO x catalysts were prepared by a facile hydrothermal method. Compared with CeTiO x catalysts synthesized under the same conditions, the catalytic activity and anti-SO 2 performance of the Ce1Zr1TiO x catalyst are greatly improved, and at the gas hourly space velocity (GHSV) of 60 000 h –1, the NO x removal efficiency is maintained at 90% in the temperature range of 290–500 °C. The catalytic effect of ZrO 2 on the Ce–Ti catalyst NH 3 -SCR activity was elucidated through a series of characterizations. The results revealed that the doping of Zr could significantly improve and optimize the structure of Ce–Ti catalysts. At the same time, due to the doping of Zr, the synergistic effect between Ce and Zr in the CeZrTiO x catalyst can effectively increase oxygen mobility, total acid content, and surface adsorbed oxygen species and lead to a larger pore volume. In addition, the introduction of ZrO 2 made the transformation of Ce 4+ into Ce 3+ more obvious, and the 2Ce 4+ + Zr 2+ ↔ 2Ce 3+ + Zr 4+ reaction greatly improved the reducibility of Ce1Zr1TiO x . Among them, the improvement of SCR performance and H 2 O/SO 2 tolerance is due to the electronic interaction between Zr and Ce.