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

doi:10.1016/S1872-2067(18)63031-1

Abstract

Abstract:

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.

Key words: Bimetallic catalyst, Hydrogen peroxide, Palladium, Antimony, Direct synthesis

Doudou Ding, Xingyan Xu, Pengfei Tian, Xianglin Liu, Jing Xu, Yifan 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.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(18)63031-1

https://www.cjcatal.com/EN/Y2018/V39/I4/673

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