Preparation of BiVO4/SBA-15 catalyst and its performance in the photocatalytic oxidation desulfurization
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摘要: 采用水热后合成法制备了BiVO4/SBA-15催化剂，利用XRD、SEM-EDS和N2吸附-脱附等手段对其进行表征分析，并在自制的光催化反应装置中对其静态光催化氧化脱硫性能进行了研究。结果表明，BiVO4/SBA-15催化剂具有SBA-15分子筛的介孔孔道结构，BiVO4均匀分布在SBA-15分子筛表面。BiVO4/SBA-15催化剂具有良好的催化氧化脱硫性能，在BiVO4负载量为15%、水热合成时间为18 h、530℃下焙烧3 h制备的BiVO4/SBA-15催化剂，对模拟柴油的脱硫率可达95.6%。
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关键词:
- BiVO4/SBA-15 /
- 水热后合成法 /
- 光催化 /
- 氧化脱硫
Abstract: The BiVO4/SBA-15 catalyst was prepared by post-hydrothermal method and characterized by XRD, SEM-EDS and N2 adsorption-desorption; its performance in the photocatalytic oxidation desulfurization was investigated in a homemade static desulfurization reactor. The results indicated that the BiVO4/SBA-15 catalyst presents mesoporous pore structure of SBA-15 molecular sieve and BiVO4 is evenly dispersed on the SBA-15 surface. The BiVO4/SBA-15 catalyst exhibits excellent activity in the photocatalytic oxidation desulfurization; for the desulfurization of a simulated diesel fuel over the BiVO4/SBA-15 catalyst with a BiVO4 loading of 15%, hydrothermally treated for 18 h and calcined at 530℃ for 3 h, the desulfurization rate reaches 95.6%.-
Key words:
- BiVO4/SBA-15 /
- post-hydrothermal synthesis /
- photocatalysis /
- oxidation desulfuruzation
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图 1 SBA-15和不同负载量的BiVO4/SBA-15的小角XRD谱图
Figure 1 Small angle XRD patterns of SBA-15 and BiVO4/SBA-15 with different BiVO4 loadings
a: SBA-15; b: 10%BiVO4/SBA-15; c: 15%BiVO4/SBA-15; d: 20%BiVO4/SBA-15
图 2 SBA-15和不同负载量的BiVO4/SBA-15催化剂的大角XRD谱图
Figure 2 Wide angle XRD patterns of SBA-15 and BiVO4/SBA-15 with different BiVO4 loadings
a: BiVO4; b: 20%BiVO4/SBA-15; c: 15%BiVO4/SBA-15; d: 10%BiVO4/SBA-15
图 3 SBA-15和不同负载量的BiVO4/SBA-15催化剂的N2吸附-脱附曲线
Figure 3 N2 adsorption-desorption isotherms of SBA-15 and BiVO4/SBA-15 catalyst with different BiVO4 loading
a: SBA-15; b: 10%BiVO4/SBA-15; c: 15%BiVO4/SBA-15; d: 20%BiVO4/SBA-15
图 4 BiVO4和不同负载量的BiVO4/SBA-15催化剂的紫外-可见光吸收光谱谱图
Figure 4 UV-vis spectra of BiVO4 and BiVO4/SBA-15 with different BiVO4 loadings
a: BiVO4; b: 20%BiVO4/SBA-15; c: 15%BiVO4/SBA-15; d: 10%BiVO4/SBA-15
图 6 SBA-15和BiVO4/SBA-15催化剂的SEM照片
Figure 6 SEM images of the SBA-15 and BiVO4/SBA-15 catalyst
(a): SBA-15(×5000); (b): 15%BiVO4/SBA-15(×10000); (c): 15%BiVO4/SBA-15(×30000)
图 8 不同条件下脱硫率的比较
Figure 8 Catalytic desulfurization performance of BiVO4/SBA-15 under different conditions
a: 400 W metal halide light; b: 400 W metal halide light+H2O2; c: BiVO4/SBA-15; d: BiVO4/SBA-15+400 W metal halide light; e: BiVO4/SBA-15+H2O2; f: BiVO4+H2O2+400 W metal halide light; g: 15%BiVO4/SBA-15+H2O2+400 W metal halide light(mechanical mixing) h: 15%BiVO4/SBA-15+H2O2+400 W metal halide light(hydrothermal method)
图 9 BiVO4/SBA-15水热时间对反应的影响
Figure 9 Effect of hydrothermal treatment time on the desulfurization performance of BiVO4/SBA-15
图 10 BiVO4负载量对反应的影响
Figure 10 Effect of BiVO4 loading on the desulfurization performance of BiVO4/SBA-15
图 11 BiVO4/SBA-15焙烧温度对反应的影响
Figure 11 Effect of calcination temperature on the desulfurization performance of BiVO4/SBA-15
图 12 BiVO4/SBA-15焙烧时间对反应的影响
Figure 12 Effect of calcination time on the desulfurization performance of BiVO4/SBA-15
图 13 BiVO4/SBA-15使用次数对反应的影响
Figure 13 Desulfurization performance of BiVO4/SBA-15 upon repetitive usage
表 1 样品的结构参数
Table 1 Textural properties of the SBA-15 and BiVO4/SBA-15 catalysts
Sample Surface area A/(m2·g-1) Pore volume v/(cm3·g-1) Pore size d/nm SBA-15 620.24 1.20 6.89 10%BiVO4/SBA-15 454.80 0.96 5.65 15%BiVO4/SBA-15 381.99 0.84 5.59 20%BiVO4/SBA-15 380.61 0.82 5.46 
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