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Novel synthesis of Fe 2 O 3 –Pt ellipsoids coated by double‐shelled La 2 O 3 as a catalyst for the reduction of 4‐nitrophenol
Author(s) -
Gao Yan,
Fang Jiasheng,
Zhang Yiwei,
Zhang Chao,
Zhao Shuo,
Zhou Yuming,
Huang Mengqiu,
Sheng Xiaoli
Publication year - 2018
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.4208
Subject(s) - nanocomposite , catalysis , chemistry , oxide , chemical engineering , composite number , nanoparticle , mesoporous material , platinum , fabrication , metal , nanotechnology , materials science , composite material , organic chemistry , medicine , biochemistry , alternative medicine , pathology , engineering
A facile strategy is reported for the fabrication of Pt‐loaded core–shell nanocomposite ellipsoids (Fe 2 O 3 ‐Pt@DSL) consisting of ellipsoidal Fe 2 O 3 cores, double‐layered La 2 O 3 shells and deposited Pt nanoparticles (NPs). The formation of the doubled‐shelled structure uses Fe 2 O 3 ‐Pt@mSiO 2 as template sacrificial agent and it involves the re‐deposition of silica and self‐assembly of metal oxide units. The preparation methods of double‐shelled metal oxides avoid repeated coating and etching and could be utilized to fabricate other shaped double‐shelled composites. Characterization results indicated that the Fe 2 O 3 ‐Pt@DSL nanocomposites possessed mesoporous structure and tunable shell thickness. Moreover, due to the formation of Fe 2 O 3 and La 2 O 3 composites, Pt NPs can also be stabilized via deposition on chemically active oxides with a synergistic effect. Therefore, as a catalyst for the reduction of 4‐nitrophenol, Fe 2 O 3 ‐Pt@DSL showed superior catalytic activity and reusability due to structural superiority and enhanced composite synergy. Finally, well‐dispersed Pt NPs were encapsulated into the void between the shell layers to construct the Fe 2 O 3 ‐Pt@DSL‐Pt catalyst.