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Ordered mesoporous Pt/Fe 3 O 4 –CeO 2 heterostructure gel particles with enhanced catalytic performance for the reduction of 4‐nitrophenol
Author(s) -
Zheng Renrong,
Feng Dawei,
Yu Hui
Publication year - 2020
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.5341
Subject(s) - mesoporous material , catalysis , nanomaterial based catalyst , chemical engineering , heterojunction , nanoparticle , transition metal , 4 nitrophenol , oxide , nitrophenol , selective catalytic reduction , noble metal , materials science , aerogel , chemistry , nanotechnology , metallurgy , organic chemistry , optoelectronics , engineering
The unique physicochemical properties of ordered mesoporous transition metal oxides have attracted more and more attention. The hydrolysis process of metal oxide precursors is difficult to control, and it is difficult to synthesize an ordered mesoporous transition metal oxide material using the conventional template method. Ordered mesoporous Pt/Fe 3 O 4 –CeO 2 heterostructure gel materials with excellent catalytic properties were successfully prepared using aerogel technology and the chemical deposition method. The Pt/Fe 3 O 4 –CeO 2 material was an n–n combined heterostructured semiconductor material which consisted of a magnetic Fe 3 O 4 layer, a CeO 2 core and Pt noble metal doped nanoparticles. A layer of Fe 3 O 4 thin film was formed on the surface of ordered mesoporous Pt/CeO 2 gel matrix material using the chemical deposition method. The intriguing heterostructural features could facilitate reactant diffusion and exposure of active sites which could enhance synergistic catalytic effects between the Pt nanoparticles and CeO 2 nanoparticles. Compared with Pt/CeO 2 , the prepared Pt/Fe 3 O 4 –CeO 2 showed enhanced catalytic activity in the reduction of 4‐nitrophenol at room temperature. The catalytic activity of the heterostructure catalysts was systematically investigated using 4‐nitrophenol reduction as a model reaction. The results showed that the Pt (0.1%)/Fe 3 O 4 –CeO 2 sample exhibited the optimal catalytic performance toward catalytic reduction of 4‐nitrophenol to 4‐aminophenol. The study provided a method for the preparation of heterostructure nanocatalysts with high efficiency, which would be effective for application in various catalytic reactions.