Ce掺杂ZnO光催化氧化脱硫性能

Photocatalytic oxidation desulfurization properties of Ce-doped ZnO

以水热反应制备前体和随后高温煅烧的方法制得了稀土元素Ce掺杂的ZnO光催化剂。利用X射线衍射、紫外可见、扫描电镜和能谱仪(EDS)对样品进行了物理性质表征,考察了催化剂制备条件、催化剂中Ce、Zn掺杂比和实验条件对催化剂光催化氧化脱硫性能的影响。结果表明,Ce和Zn的摩尔比对Zn(1-x)CexO催化剂的光催化氧化脱硫性能有显著影响;最佳条件100℃水热反应4h、300℃煅烧2h,制得的Zn0.89Ce0.11O催化剂在模拟油200mL(含硫量300mg/L)、n(O)/n(S)为39(H2O2 15mL)、催化剂0.3g和紫外光照射1.5h的条件下脱硫率高达98.9%,经过5次再生循环使用后脱硫率没有明显降低。

The rare earth Ce doped ZnO has been prepared with the precursor prepared by hydrothermal method and subsequently calcinated at high temperature.The samples were characterized by X-ray diffraction(XRD),UV-vis,field emission scanning electron microscopy(FESEM)and EDS,respectively.The effects of various experimental parameters on the photocatalytic oxidation desulfurization were investigated.The results showed that the molar ratio of Ce to Zn had significant influence on the photocatalytic oxidation desulfurization properties of the Zn(1-x)CexO catalyst.The optimum preparation parameters were hydrothermal time of 4h at 100℃,calcination treatment of 300℃at 2h to the Zn0.89Ce0.11O catalyst,200mL model oil(sulfur content of 300mg/L),n(O)/n(S)molar ratio of 39(H2O2 15mL),0.3g catalyst and irradiated under UV-light for 1.5h.The maximum desulfurization rate of the model oil was 98.9%under the above optimum conditions.The desulfurization rate of the catalyst did not decrease obviously after reused for five times.