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Divanadium‐Substituted Phosphotungstate Supported on Magnetic Mesoporous Silica Nanoparticles as Effective and Recyclable Catalysts for the Selective Oxidation of Alcohols
Author(s) -
Dong Xinbo,
Zhang Xi,
Wu Panfeng,
Zhang Yanjie,
Liu Bin,
Hu Huaiming,
Xue Ganglin
Publication year - 2016
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201601077
Subject(s) - catalysis , mesoporous material , mesoporous silica , phosphotungstic acid , nanoparticle , hydrogen peroxide , benzaldehyde , chemistry , magnetic nanoparticles , materials science , chemical engineering , heterogeneous catalysis , benzyl alcohol , inorganic chemistry , organic chemistry , nanotechnology , engineering
A new magnetically recyclable catalyst (Fe 3 O 4 @mSiO 2 /NH‐PV 2 W) was fabricated by immobilizing divanadium‐substituted Keggin phosphotungstic acid H 5 PV 2 W 10 O 40 on mesoporous‐silica‐coated Fe 3 O 4 core–shell nanoparticles by a facile procedure. The magnetic core–shell nanoparticles were prepared by coating a thin mesoporous silica shell directly on pristine magnetic Fe 3 O 4 and functionalized with amino radicals simultaneously. Then the active H 5 PV 2 W 10 O 40 was immobilized on the mesoporous silica shell of the Fe 3 O 4 core–shell nanoparticles. The obtained catalyst was characterized by using SEM, TEM, IR spectroscopy, XRD, N 2 sorption–desorption, and magnetometry. The catalytic properties were evaluated for a series of alcohols that were oxidized selectively to the corresponding aldehydes or ketones using hydrogen peroxide as the oxidant. The results show that H 5 PV 2 W 10 O 40 ‐loaded mesoporous silica‐coated Fe 3 O 4 catalyst presents high catalytic activities with 98 % conversion of benzyl alcohol and 99 % selectivity to benzaldehyde. After the reaction, the catalyst could be separated easily with an external magnetic field, and the recovered catalyst could be reused at least five times without any loss of catalytic activity.