Preparation of WO 3 /g-C 3 N 4 composites and their application in oxidative desulfurization
Preparation of WO 3 /g-C 3 N 4 composites and their application in oxidative desulfurization
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DOI：
10.1016/j.apsusc.2016.08.120
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发表时间：
2017-01
影响因子：
6.7
通讯作者：
Rongxiang Zhao;Xiu-ping Li;Jianxun Su;Xiaohan Gao
中科院分区：
文献类型：
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作者：
Rongxiang Zhao;Xiu-ping Li;Jianxun Su;Xiaohan Gao
将WO 3和石墨化氮化碳（g-C3 N4）混合物在400 °C下煅烧2 h，成功制备了WO 3/g-C3 N4复合材料。以磷钨酸为原料，在550 °C下煅烧4 h制备WO 3，以三聚氰胺为原料，在520 °C下煅烧4 h制备g-C3 N4。采用X射线衍射（XRD）、扫描电子显微镜（SEM）、傅里叶变换红外光谱（FT-IR）和Brunner−Emmett−Teller分析（BET）对WO 3/g-C3 N4复合材料进行了表征。WO 3/g-C3 N4复合物的XRD峰强于WO 3和纯g-C3 N4。此外，对于36% − WO 3/g-C3 N4复合物，在25.7°和26.6°处出现两个WO 3峰。这表明WO 3在g-C3 N4纳米片表面高度分散，并与纳米片相互作用，形成了（012）和（022）晶面。与纯的g-C3 N4和WO 3相比，WO 3/g-C3 N4复合物具有更大的比表面积和更高的结晶度，从而提高了催化剂的活性。脱硫实验表明，在最佳条件下，二苯并噻吩（DBT）在模拟油中的脱硫率可达91.2%。此外，催化剂的活性在5次循环后没有显著降低。
WO3/graphitic carbon nitride (g-C3N4) composites were successfully synthesized through direct calcining of a mixture of WO3and g-C3N4at 400 °C for 2 h. The WO3was prepared by calcination of phosphotungstic acid at 550 °C for 4 h, and the g-C3N4was obtained by calcination of melamine at 520 °C for 4 h. The WO3/g-C3N4composites were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FT-IR), and Brunner−Emmett−Teller analysis (BET). The WO3/g-C3N4composites exhibited stronger XRD peaks of WO3and g-C3N4than the WO3and pure g-C3N4. In addition, two WO3peaks at 25.7° and 26.6° emerged for the 36% −WO3/g-C3N4composite. This finding indicated that WO3was highly dispersed on the surface of the g-C3N4nanosheets and interacted with the nanosheets, which resulted in the appearance of (012) and (022) planes of WO3. The WO3/g-C3N4composite also exhibited a larger specific surface area and higher degree of crystallization than WO3or pure g-C3N4, which resulted in high catalytic activity of the catalyst. Desulfurization experiments demonstrated that the desulfurization rate of dibenzothiophene (DBT)in model oil reached 91.2% under optimal conditions. Moreover, the activity of the catalyst was not significantly decreased after five recycles.