Tan Yifeng, Li Fan, Zhao Bing, Chen Wenlin, Tian Mengkui
College of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, Guizhou, China.
Langmuir. 2021 Dec 28;37(51):14823-14832. doi: 10.1021/acs.langmuir.1c02597. Epub 2021 Dec 16.
A series of mesoporous CeZrTiO catalysts were prepared by a facile hydrothermal method. Compared with CeTiO catalysts synthesized under the same conditions, the catalytic activity and anti-SO performance of the Ce1Zr1TiO catalyst are greatly improved, and at the gas hourly space velocity (GHSV) of 60 000 h, the NO removal efficiency is maintained at 90% in the temperature range of 290-500 °C. The catalytic effect of ZrO on the Ce-Ti catalyst NH-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 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 made the transformation of Ce into Ce more obvious, and the 2Ce + Zr ↔ 2Ce + Zr reaction greatly improved the reducibility of Ce1Zr1TiO. Among them, the improvement of SCR performance and HO/SO tolerance is due to the electronic interaction between Zr and Ce.
采用简便的水热法制备了一系列介孔CeZrTiO催化剂。与在相同条件下合成的CeTiO催化剂相比，Ce1Zr1TiO催化剂的催化活性和抗SO性能得到了极大提高，在气体时空速度（GHSV）为60000 h时，在290-500℃的温度范围内，NO去除效率保持在90%。通过一系列表征阐明了ZrO对Ce-Ti催化剂NH-SCR活性的催化作用。结果表明，Zr的掺杂可以显著改善和优化Ce-Ti催化剂的结构。同时，由于Zr的掺杂，CeZrTiO催化剂中Ce和Zr之间的协同效应可以有效提高氧迁移率、总酸含量和表面吸附氧物种，并导致更大的孔体积。此外，ZrO的引入使Ce向Ce的转变更加明显，2Ce + Zr ↔ 2Ce + Zr反应极大地提高了Ce1Zr1TiO的还原性。其中，SCR性能和HO/SO耐受性的提高归因于Zr和Ce之间的电子相互作用。
