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.

的热稳定性聚晶微孔的TiO ₂（米-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。