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 shu

Catalytic Oxidation of o-Xylene over Pd/γ-Al₂O₃ Catalysts

HU Ling-Xiao ^1,2, ,
WANG Lian ^1,2 ,
WANG Fei ^1,2 ,
ZHANG Chang-Bin ^1,2 ,
HE Hong ^1,2,3

1.
State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, P. R. China;
2.
University of Chinese Academy of Sciences, Beijing 100049, P. R. China;
3.
Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, Fujian Province, P. R. China

Received Date: 28 December 2016
Revised Date: 27 March 2017

Fund Project: The project was supported by the National Natural Science Foundation for Excellent Young Scholars, China (21422706) and National Natural Science Foundation of China (51678560).

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.
- γ-Al₂O₃,
- Noble metal catalyst,
- Catalytic oxidation,
- o-Xylene
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沈阳化工大学材料科学与工程学院沈阳 110142

Catalytic Oxidation of o-Xylene over Pd/γ-Al2O3 Catalysts

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Catalytic Oxidation of o-Xylene over Pd/γ-Al₂O₃ Catalysts