Citation: HU Ling-Xiao, WANG Lian, WANG Fei, ZHANG Chang-Bin, HE Hong. Catalytic Oxidation of o-Xylene over Pd/γ-Al2O3 Catalysts[J]. Acta Physico-Chimica Sinica, ;2017, 33(8): 1681-1688. doi: 10.3866/PKU.WHXB201704192
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1% (w)Pd/γ-Al2O3 catalysts were prepared by the impregnation method using nano γ-Al2O3 (10 nm) and γ-Al2O3 (200-300 nm) as support materials. The catalysts were tested for catalytic oxidation of o-xylene and the difference of catalyst activity before and after hydrogen reduction was investigated. The results indicate that 1% (w)Pd/γ-Al2O3 (nano) has the highest catalytic activity for o-xylene oxidation after H2 reduction, and the T90 (The temperature of conversion rate of o-xylene reaches 90%) was 150℃. The structure-activity relationships of the catalysts were studied by X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS), while the specific surface area was determined using the Brunauer-Emmett-Teller (BET) isotherm. The results show that the reduced Pd is the active species for catalytic oxidation of o-xylene. Pd particle size has a significant influence on the catalyst activity and a small Pd particle size is favorable. There is a strong interaction between the supporter (nano γ-Al2O3) and the Pd species, which facilitates the particle size control and Pd dispersion, thereby increasing the catalyst activity of the 1% (w)Pd/γ-Al2O3(nano) catalyst.
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Keywords:
- γ-Al2O3,
- Noble metal catalyst,
- Catalytic oxidation,
- o-Xylene
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