Direct synthesis of H2O2 over Pd–M@HCS (M = Sn, Fe, Co, or Ni): effects of non-noble metal M on the electronic state and particle size of Pd. (19th April 2022)

• Record Type: Journal Article
• Authors: Wu, Quansheng; Zhou, Songhua; Fu, Chengbing; Zhang, Jiesong; Chen, Bo; Pan, Hongyan; Lin, Qian
• Is Part Of: New journal of chemistry. Volume 46:Number 18(2022)
• Page Start: 8739
• Page End: 8751
• Publication Date: 2022-04-19
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/d2nj01074g
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : Direct synthesis of H2 O2 in a yolk–shell structure assisted by M (M = Fe, Co, Ni, Sn) metal doping. Abstract : For the mono-metal Pd based catalysts, the O–O bond in O2 and H2 O2 is easily dissociated due to the higher energy sites of Pd, which decreases the selectivity and productivity of H2 O2 . To address this issue, non-noble metals M (M = Sn, Fe, Co, Ni) were doped into palladium precursors to create a series of yolk–shell structure bimetallic catalysts Pd–M@HCS (H = hollow; C = carbon; S = sphere) with Pd–M as the core and porous carbon as the shell. The results indicated that the catalyst Pd–M@HCS doped with Sn, Fe, Co, and Ni has a weak dissociation ability for O2, and both the adsorption and dissociation ability for H2 are improved. Of these catalysts, the catalyst Pd–Sn@HCS gives the best performance, which is benefited by the suitable Pd–Sn nanoparticle size and the best Pd 2+ /Pd 0 ratio. The influence of the n Pd / n Sn ratio in the Pd–Sn@HCS system on catalyst performance was further explored, and the findings revealed that Pd–Sn@HCS had the best catalytic activity and stability when the n Pd / n Sn ratio was 2. The catalyst's H2 conversion, H2 O2 selectivity, and productivity were 35%, 97%, and 3961 mmol gPd −1 h −1, respectively. After 10 cycles, the H2 O2 productivity of this catalyst remained at 92.1%, which was greater than the H2 O2 productivity of the typical Pd-based catalyst Pd/C, which stayed at 37% under the same conditions.