Citation: Kang Shunyu, Wang Meng, Zhu Na, Wang Chunying, Deng Hua, He Hong. Significant enhancement in water resistance of Pd/Al₂O₃ catalyst for benzene oxidation by Na addition[J]. Chinese Chemical Letters, ;2019, 30(7): 1450-1454. doi: 10.1016/j.cclet.2019.03.023 shu

Significant enhancement in water resistance of Pd/Al₂O₃ catalyst for benzene oxidation by Na addition

Kang Shunyu ^a,b ,
Wang Meng ^a,b ,
Zhu Na ^a,b ,
Wang Chunying ^a,b ,
Deng Hua ^a,*, ,
He Hong ^a,b,c

a.
Center for Excellence in Regional Atmospheric Environment, Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
b.
University of Chinese Academy of Sciences, Beijing 100049, China
c.
State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China

huadeng@iue.ac.cn

Received Date: 11 January 2019
Revised Date: 22 February 2019
Accepted Date: 14 March 2019
Available Online: 16 July 2019

Figures(4)

A series of Na-doped 1 wt% Pd/Al₂O₃ catalysts with different Na loadings were prepared by wet impregnation and tested for the catalytic oxidation of benzene. Suitable addition of Na had a remarkable promotion effect on water resistance and enhancement of low temperature activity of Pd/Al₂O₃ catalysts. The optimal mole ratio between Na and Pd was 1:1. The properties of the prepared catalysts were characterized by X-ray diffraction (XRD), Brunauer Emmett Teller (BET), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), O₂-temperature-programmed desorption (O₂-TPD), and in situ DRIFTS. Results indicated that the addition of Na not only decreased the content of adsorbed water species but also increased the amount of liable surface oxygen species, which are likely the key factors for the excellent water resistance of the catalyst. Na addition also improved the mobility of the lattice oxygen species, which was favorable for catalytic activity. Moreover, the well-dispersed negatively charged Pd particles and suitable redox properties derived from Na addition also contributed to the improved performance and water resistance of the Na₁Pd₁/Al₂O₃ catalyst. In situ DRIFTS results revealed that benzene was oxidized to maleate and acetate species via intermediate o-benzoquinone species, which finally turned into harmless CO₂ and H₂O.
- Sodium addition,
- Pd/Al₂O₃,
- Benzene,
- Water resistance,
- Catalytic oxidation
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Significant enhancement in water resistance of Pd/Al2O3 catalyst for benzene oxidation by Na addition

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通讯作者: 陈斌, bchen63@163.com

Significant enhancement in water resistance of Pd/Al₂O₃ catalyst for benzene oxidation by Na addition