State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science & Technology, Wuhan, 430074, China.
State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science & Technology, Wuhan, 430074, China.
Chemosphere. 2022 Jan;287(Pt 3):132336. doi: 10.1016/j.chemosphere.2021.132336. Epub 2021 Sep 24.
The elemental mercury was catalytically removed by VO/TiO and Ce doped VO/TiO catalysts under the UV irradiation at 30-160 °C to determine whether the catalysts could simultaneously have both thermo- and photo-catalytic activities. The physicochemical properties of catalysts were characterized by XRD, SEM, EDX, BET, XPS, UV-visible, PER and EIS. The experimental results demonstrated that VO/TiO and Ce-doped catalysts possessed both thermo- and photo-catalytic reactivities. A suitable reaction temperature (120 °C) and UV light had promoting effects on mercury removal efficiency. In addition, owing to the high oxidation capability as well good oxygen storage performance of Ce, Ce doping could greatly improve the mercury removal properties of the catalyst, reduce the inhibition of SO and make NO the component with enhanced effect. Ce doping also had the capability of enhancing the light absorption intensity in the UV region as well as the separation rate of photoinduced carriers. Finally, DFT calculations of V-Ti and Ce-V-Ti for Hg removal were investigated to further verify the experimental conclusion.
在 30-160°C 的紫外线照射下，通过 VO/TiO 和 Ce 掺杂 VO/TiO 催化剂催化去除元素汞，以确定催化剂是否同时具有热催化和光催化活性。通过 XRD、SEM、EDX、BET、XPS、UV-可见、PER 和 EIS 对催化剂的物理化学性质进行了表征。实验结果表明，VO/TiO 和 Ce 掺杂催化剂均具有热催化和光催化活性。适当的反应温度（120°C）和紫外光对汞去除效率有促进作用。此外，由于 Ce 具有较高的氧化能力和良好的储氧性能，Ce 掺杂可以大大提高催化剂的汞去除性能，减少 SO 的抑制作用，并使 NO 成为增强作用的组分。Ce 掺杂还具有增强 UV 区域光吸收强度以及光生载流子分离速率的能力。最后，通过对 V-Ti 和 Ce-V-Ti 进行 DFT 计算，进一步验证了实验结论。
