Citation: Doudou Ding, Xingyan Xu, Pengfei Tian, Xianglin Liu, Jing Xu, Yi-Fan Han. Promotional effects of Sb on Pd-based catalysts for the direct synthesis of hydrogen peroxide at ambient pressure[J]. Chinese Journal of Catalysis, ;2018, 39(4): 673-681. doi: 10.1016/S1872-2067(18)63031-1 shu

Promotional effects of Sb on Pd-based catalysts for the direct synthesis of hydrogen peroxide at ambient pressure

a State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;
b Research Center of Heterogeneous Catalysis and Engineering Science, School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou 450001, Henan, China

Received Date: 30 November 2017
Revised Date: 10 January 2018

Fund Project: This work was supported by the National Natural Science Foundation of China (91534127, U1463205), the Innovation Scientists and Technicians Troop Construction Projects of Henan Province, and the Chinese Education Ministry 111 Project (B08021).

TiO₂-supported Pd-Sb bimetallic catalysts were prepared and evaluated for the direct synthesis of H₂O₂ at ambient pressure. The addition of Sb to Pd significantly enhanced catalytic performance, and a Pd₅₀Sb catalyst showed the greatest selectivity of up to 73%. Sb promoted the dispersion of Pd on TiO₂, as evidenced by transmission electron microscopy and X-ray diffraction. X-ray photoelectron spectroscopy indicated that the oxidation of Pd was suppressed by Sb. In addition, Sb₂O₃ layers were formed and partially wrapped the surfaces of Pd catalysts, thus suppressing the activation of H₂ and subsequent hydrogenation of H₂O₂. In situ diffuse reflection infrared Fourier transform spectroscopy for CO adsorption suggested that Sb homogenously located on the surface of Pd-Sb catalysts and isolated contiguous Pd sites, resulting in the rise of the ratio of Pd monomer sites that are favorable for H₂O₂ formation. As a result, the Sb modified Pd surfaces significantly enhanced the non-dissociative activation of O₂ and H₂O₂ selectivity.
- Bimetallic catalyst,
- Hydrogen peroxide,
- Palladium,
- Antimony,
- Direct synthesis
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