Synthesis, Characterization and Properties of Magnetic Nanometer-sized Solid Superacid

Abstract

Abstract: In this paper, magnetic solid acid catalyst of SO₄^2-/Co_0.5Fe_2.5O₄-ZrO₂ with different molar ratios has been synthesized, and the influence of magnetic substrates Co_0.5Fe_2.5O₄ on particle size, crystallizing temperature, and crystal structure of ZrO₂ was investigated. The catalytic activity of the magnetic solid acid was studied for esterification reaction, and life, recovery and variation of magnetic property of the catalyst were tested. The results show that the addition of the magnetic substrate not only magnetizes but also delay the conversion from ZrO₂(t) to ZrO₂(m) during the formation of solid superacid, which makes acid sites on the surface of sample more stable and promotes its superacidity and catalytic activity. The conversion of esterification catalyzed by SO₄^2-/Co_0.5Fe_2.5O₄-ZrO₂ can reach 97.31% and 74.69% conversion can be obtained after it was used for 6 times in the reaction and after it was regenerated, the conversion reaches 96.25%, meaning that the catalytic activity of this catalyst may be recovered.

Key words: Magnetic property, Solid superacid, Nanometer particle, Catalyst

CLC Number:

O643.1

TrendMD:

ZHANG Mi-Lin, WANG Jun, MEI Chang-Song, JING Xiao-Yan, DUAN Xue . Synthesis, Characterization and Properties of Magnetic Nanometer-sized Solid Superacid[J]. Chem. J. Chinese Universities, 2002, 23(7): 1347.

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Synthesis, Characterization and Properties of Magnetic Nanometer-sized Solid Superacid

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