Promotional effects of zirconium doped CeVO4 for the low-temperature selective catalytic reduction of NOx with NH3

作者：Zhao, Xin; Huang, Lei; Li, Hongrui; Hu, Hang; Hu, Xiaonan; Shi, Liyi; Zhang, Dengsong^*

来源：Applied Catalysis B: Environmental , 2016, 183: 269-281.

DOI：10.1016/j.apcatb.2015.10.052

• Selective catalytic reduction
• Zr doped
• CeVO4
• Vanadates
• deNO(x)

In this work, we developed a novel zirconium doped CeVO4 to form Ce1-xZrxVO4 (x = 0.05, 0.10, 0.15, 0.20, 0.30, 0.50, 0.70, 0.80) solid solution as a low-temperature catalyst for the selective catalytic reduction (SCR) of NOx, with NH3. The optimized catalysts showed excellent performance at low temperature. The light-off temperature (the temperature at which the conversion of NOx reaches 50%) was down to about 125 degrees C, while the temperature window (the NO(x)conversion is above 80%) ranged from 150 to 375 degrees C. The selectivity was kept close to 100% during the whole temperature range. Furthermore, the catalysts also exhibited good H2O/SO2 durability and fascinating performance at high gas hourly space velocity of 400,000 h(-1). Hydrogen temperature-programmed reduction, X-ray photoelectron spectroscopy, ammonia and nitrogen oxides temperature-programmed desorption and in-situ diffuse reflectance infrared Fourier transform experiments were performed to study the influence of Zr doping on the SCR performance. 'two found that the introduction of Zr in CeVO4 with a proper amount could significantly increase the surface area, oxidative ability, active oxygen species and especially surface acid sites of the catalysts, which were beneficial to the promotion of SCR performance.

• 出版日期2016-4
• 单位上海大学