Premium
CeO 2–δ ‐Modified CuFe 2 O 4 with Enhanced Oxygen Transfer as Efficient Catalysts for Selective Oxidation of Fluorene under Mild Conditions
Author(s) -
Huang Xiubing,
Wang Peng,
Zhang Hean,
Guo Zhengwei,
Liu Jijia,
Lu Guilong,
Pang Guangsheng,
Wang Ge
Publication year - 2019
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201801374
Subject(s) - catalysis , nanoclusters , chemistry , fluorene , radical , x ray photoelectron spectroscopy , oxygen , surface modification , chemical engineering , photochemistry , organic chemistry , polymer , engineering
The design of efficient catalysts for the selective oxidation of sp 3 C–H bond with air at low temperature is of great importance to the scientific and industrial community. In this work, we design a CeO 2–δ modified CuFe 2 O 4 catalyst by a post‐modification method for the selective oxidation of fluorene under an air atmosphere and N‐hydroxyphthalimide (NHPI) at 60 °C. HRTEM results indicate that CeO 2–δ nanoclusters sized around 5 nm are successfully modified on the surface of CuFe 2 O 4 . XPS and H 2 ‐TPR results show that CeO 2–δ modification would favor oxygen transfer at lower temperature due to the synergetic effect between CuFe 2 O 4 and CeO 2–δ with rich Ce 3+ /Ce 4+ couples. The results demonstrate that CuFe 2 O 4 @CeO 2–δ ‐0.05 with 4.20 wt.‐% Ce present the best catalytic performance with 94 % conversion of fluorene and excellent reusability at least five times. It is anticipated that the modification of CeO 2–δ nanoclusters on the surface leads to increased oxygen activation and transfer to CuFe 2 O 4 , which favors the activation of NHPI to phthalimide‐ N ‐oxyl (PINO) radicals and exhibits an improved catalytic performance. Our results provide some guidance on the design of efficient catalysts by the surface modification strategy.