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Improvement of thermal stability of microporous TiO2 for NH3-SCR reaction using multivalent cations
Catalysis Today ( IF 5.2 ) Pub Date : 2017-11-16 , DOI: 10.1016/j.cattod.2017.11.016
Soon Hee Park , Seung Gwan Lee , Sung June Cho

The thermal stability of polycrystalline microporous TiO2 (m-TiO2) has been improved by incorporating multivalent cations such as La3+ and Ce3+. The changes in the crystal structure upon heating were monitored using X-ray powder diffraction and N2 adsorption-desorption isotherms. The presence of multivalent cations significantly increased the thermal stability of TiO2, as inferred from the changes in the surface area, pore volume, and X-ray diffraction pattern. The catalytic performance of the pristine V/m-TiO2 catalyst in the NH3-SCR reaction increased from 40% to 70% and 80% by using the V/m-TiO2 catalyst containing La3+ and Ce3+, respectively, after thermal treatment at 500 °C for 2 h. Further it was demonstrated that the addition of WOx onto La3+ or Ce3+ modified m-TiO2 affected the corresponding thermal stability and the catalytic performance, suggesting that the Ce3+ seemed to be best for the improvement of thermal stability.



中文翻译:

利用多价阳离子提高NH 3 -SCR反应中微孔TiO 2的热稳定性

的热稳定性聚晶微孔的TiO 2-TiO 2)通过结合多价阳离子如La已经改进3+和Ce 3+。使用X射线粉末衍射和N 2吸附-解吸等温线监测加热时的晶体结构变化。从表面积,孔体积和X射线衍射图谱的变化推断,多价阳离子的存在显着提高了TiO 2的热稳定性。原始V / m -TiO 2催化剂在NH 3中的催化性能在500°C热处理2 h后,分别使用含La 3+和Ce 3+的V / m -TiO 2催化剂,-SCR反应从40%增至70%和80%。进一步证明,在La 3+或Ce 3+改性的m -TiO 2上添加WOx会影响相应的热稳定性和催化性能,这表明Ce 3+似乎是改善热稳定性的最佳方法。

更新日期:2017-11-16
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