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Chen, Hao; Shen, Jinshan; Chen, Kequan; Qin, Yong; Lu, Xiuyang; Ouyang, Pingkai; Fu, Jie
Applied catalysis. A, General, 04/2018, Letnik: 555Journal Article
Display omitted •Highly active Pt/ZrO2 catalyst was synthesized by the atomic layer deposition.•Atomic layer deposition produced highly dispersed and uniform Pt particles.•Pt/ZrO2 showed excellent activity for the base-free oxidation of 5-HMF.•The highest 2,5-FDCA yield of 97% with a 5-HMF conversion of 100% was obtained. The oxidation of 5-hydroxymethylfurfural (5-HMF) to 2,5-furandicarboxylic acid (2,5-FDCA) under base-free condition is one of the most attractive reactions. This work first reported the synthesis of highly efficient oxidation of 5-HMF to 2,5-FDCA catalyst using the atomic layer deposition (ALD) to deposit Pt nanoparticles on low surface area zirconium oxide (ZrO2). Pt/ZrO2 synthesized by ALD showed excellent activity for the oxidation of 5-HMF to 2,5-FDCA in base-free solution compared with Pt/MOx synthesized by other methods in this work or reported already. The highly dispersed and uniform particle size of Pt particles were demonstrated by transmission electron microscopy (TEM), X-ray diffraction (XRD) and temperature programmed desorption of CO (CO-TPD), which provided a striking improvement of the catalytic activity in the oxidation of 5-HMF. An enhanced CO adsorption property of Pt/ZrO2 obtained by ALD was also characterized by CO-TPD. The enhanced adsorption property of CO facilitated a stronger adsorption between catalyst and reactant/intermediates, which associated with the high dispersion and uniform particle size distribution of Pt particles to make the adsorbed reactant be efficiently converted to 2,5-FDCA.
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