Promotion Effect of Chromium on the Activity and SO2 Resistance of CeO2–TiO2 Catalysts for the NH3-SCR Reaction

• DOI: 10.1021/acs.iecr.1c00898
• Publication Date: 2021-07-28T18:43:02Z
• Authors: Wuyuan Liu; Zihan Gao; Xiangyun Zhao; Jiajian Gao; Runnong Yang; Lin Yu
• Keywords: Thermogravimetric analysis; Coprecipitation; Selective catalytic reduction; Temperature-programmed reduction

The Cr-doped CeO2–TiO2 catalysts (CrCeTi) were produced via a coprecipitation method and used for selective catalytic reduction (SCR). CrCeTi catalyst has good performance sulfur resistance. results of X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), NH3-TPD, NO-TPD, photoelectron spectroscopy (XPS), H2 temperature-programmed (H2-TPR) suggested that the with high specific surface area (SSA), strong acidity, enhanced redox properties, effective electron transfer (3Ce4+ + Cr3+ ↔ 3Ce3+ Cr6+) important promotion factors excellent SCR properties. in situ diffuse reflectance infrared (DRIFTS) indicated incorporation Cr could improve adsorption capacity nitrate activation NH3, which conducive to enhancing activity. thermogravimetric analysis-mass spectrometry (TG-MS) confirmed doping reduced SO2 promoted decomposition NH4HSO4 (ABS). Therefore, showed resistance poisoning.