Hydrothermal Synthesis of a Ce–Zr–Ti Mixed Oxide Catalyst with Enhanced Catalytic Performance for a NH3-SCR Reaction

• DOI: 10.1021/acs.langmuir.1c02597
• Publication Date: 2021-12-17T06:12:12Z
• Authors: Yifeng Tan; Fan Li; Bing Zhao; Wenlin Chen; Mengkui Tian
• Keywords: Space velocity; Specific surface area

A series of mesoporous CeZrTiOx catalysts were prepared by a facile hydrothermal method. Compared with CeTiOx synthesized under the same conditions, catalytic activity and anti-SO2 performance Ce1Zr1TiOx catalyst are greatly improved, at gas hourly space velocity (GHSV) 60 000 h-1, NOx removal efficiency is maintained 90% in temperature range 290-500 °C. The effect ZrO2 on Ce-Ti NH3-SCR was elucidated through characterizations. results revealed that doping Zr could significantly improve optimize structure catalysts. At time, due to Zr, synergistic between Ce can effectively increase oxygen mobility, total acid content, surface adsorbed species lead larger pore volume. In addition, introduction made transformation Ce4+ into Ce3+ more obvious, 2Ce4+ + Zr2+ ↔ 2Ce3+ Zr4+ reaction improved reducibility Ce1Zr1TiOx. Among them, improvement SCR H2O/SO2 tolerance electronic interaction Ce.