Citation: Luo Jianxin, Zhang Xucheng, Zhang Chunyan, Wang Tao, Chen Xue, Chen Hongyu, King Steve, Wang Changchun. Highly stable, active and recyclable solid acid catalyst based on polymer-coated magnetic composite particles[J]. Chinese Chemical Letters, ;2019, 30(12): 2043-2046. doi: 10.1016/j.cclet.2019.05.034 shu

Highly stable, active and recyclable solid acid catalyst based on polymer-coated magnetic composite particles

Luo Jianxin ^a,b ,
Zhang Xucheng ^b ,
Zhang Chunyan ^a,*, ,
Wang Tao ^c ,
Chen Xue ^d ,
Chen Hongyu ^c ,
King Steve ^d ,
Wang Changchun ^b,*

a.
Department of Materials and Chemical Engineering, Hunan Institute of Technology, Hengyang 421002, China
b.
State Key Laboratory of Molecular Engineering of Polymers, and Department of Macromolecular Science, Fudan University, Shanghai 200433, China
c.
Dow Chemical China Holding Company, Shanghai 201203, China
d.
Dow Chemical Company, Lake Jackson 77566, United States

chinachunyan@126.com

Received Date: 19 February 2019
Revised Date: 25 April 2019
Accepted Date: 20 May 2019
Available Online: 20 December 2019

Figures(3)

A facile approach has been adopted for coating cross-linked polystyrene (PS) shells on the surface of Fe₃O₄ magnetic clusters using reflux-precipitation polymerization (RPP). Treating the PS shell with chlorosulfonic acid yields magnetic composite particles with acid functionality. By adjusting the amount and proportion of monomers (styrene and divinylbenzene), the obtained magnetic composite particle solid acid (MPM-5S) exhibits a saturation magnetization value of 18 emu/g, a specific surface area of 243 m²/g and an acid density of 2.113 mmol/g. The MPM-5S magnetic solid acid catalyst was evaluated for esterification of oleic acid with methanol to prepare biodiesel. Under mild conditions, the conversion of oleic acid reached 91%, which was much higher than the catalytic activity of Amberlyst-15 and close to the catalytic activity of concentrated H₂SO₄. The solid acid catalyst can be recovered by magnetic separation and reused three times maintaining over 95% of its initial catalytic activity. Additionally, the solid acid can be used to catalyze the dehydration of fructose to 5-hydroxymethylfurfural.
- Reflux precipitation polymerization,
- Solid acid,
- Magnetic separation,
- Biodiesel,
- Recyclability
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