TY - JOUR
T1 - Magnetically-separable acid-resistant CoFe2O4@Polymer@MIL-100 core-shell catalysts for the acetalization of benzaldehyde and methanol
AU - Cheng, Yaran
AU - Chen, Jing
AU - Wang, Tong
AU - Wu, Qin
AU - Shi, Daxin
AU - Zhang, Yaoyuan
AU - Chen, Kangcheng
AU - Li, Hansheng
N1 - Publisher Copyright:
© 2022
PY - 2023/1
Y1 - 2023/1
N2 - Novel reusable acid-resistant magnetic polymer nanospheres-immobilized MIL-100 (CoFe2O4@Polymer@MIL-100) catalyst was prepared by a layer-by-layer method to achieve a controllable structure. The obtained core-shell catalyst consisted of modified magnetic nanoparticles as the core, a carboxylic-functionalized polymer as the protective layer, and an MIL-100 shell as the active catalytic layer by chemical bonds on the polymer. The catalysts showed good stability, good magnetic saturation, and acid corrosion resistance. The thickness of the MIL-100 shell could be adjusted by controlling the metal salt concentration and the number of layer-by-layer cycles. Nano-sized MIL-100 showed better mass transfer efficiency and catalytic activity. A conversion of 97.7% after 10 min was observed during acetalization when using CoFe2O4@Polymer@MIL-100 as the catalyst. CoFe2O4@Polymer@MIL-100 could be reused at least five times. The use of a polymer layer on CoFe2O4@Polymer@MIL-100 prevented acidic ligands from corroding the magnetic core. Chemical bonds between MIL-100 and functional magnetic polymer cores improved the catalyst's stability. CoFe2O4@Polymer@MIL-100 exhibited high activity, excellent stability, and easy magnetic separation.
AB - Novel reusable acid-resistant magnetic polymer nanospheres-immobilized MIL-100 (CoFe2O4@Polymer@MIL-100) catalyst was prepared by a layer-by-layer method to achieve a controllable structure. The obtained core-shell catalyst consisted of modified magnetic nanoparticles as the core, a carboxylic-functionalized polymer as the protective layer, and an MIL-100 shell as the active catalytic layer by chemical bonds on the polymer. The catalysts showed good stability, good magnetic saturation, and acid corrosion resistance. The thickness of the MIL-100 shell could be adjusted by controlling the metal salt concentration and the number of layer-by-layer cycles. Nano-sized MIL-100 showed better mass transfer efficiency and catalytic activity. A conversion of 97.7% after 10 min was observed during acetalization when using CoFe2O4@Polymer@MIL-100 as the catalyst. CoFe2O4@Polymer@MIL-100 could be reused at least five times. The use of a polymer layer on CoFe2O4@Polymer@MIL-100 prevented acidic ligands from corroding the magnetic core. Chemical bonds between MIL-100 and functional magnetic polymer cores improved the catalyst's stability. CoFe2O4@Polymer@MIL-100 exhibited high activity, excellent stability, and easy magnetic separation.
KW - Acetalization
KW - Heterogeneous catalyst
KW - Layer-by-layer
KW - Magnetic polymer nanocomposites
KW - Metal-organic frameworks
UR - http://www.scopus.com/inward/record.url?scp=85137269962&partnerID=8YFLogxK
U2 - 10.1016/j.jcis.2022.09.004
DO - 10.1016/j.jcis.2022.09.004
M3 - Article
C2 - 36088702
AN - SCOPUS:85137269962
SN - 0021-9797
VL - 629
SP - 571
EP - 581
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
ER -