Acta Phys. -Chim. Sin. ›› 2007, Vol. 23 ›› Issue (04): 595-600.doi: 10.3866/PKU.WHXB20070428

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Preparation and Characterization of Magnetic Solid Superacid SO2-4/ZrO2/Fe3O4/Al2O3

WANG Jun; FAN Mei-Qing; YANG Piao-Ping; YU Wei; JING Xiao-Yan; ZHANG Mi-Lin; LIU Tian-Fu; DUAN Xue   

  1. School of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, P. R. China; Key Laboratory of Science and Technology of Controllable Chemical Reactions, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, P. R. China
  • Received:2006-09-20 Revised:2006-11-20 Published:2007-04-05
  • Contact: ZHANG Mi-Lin

Abstract: A novel magnetic solid superacid SO2-4/ZrO2/Fe3O4/Al2O3 was prepared by a co-precipitation method. The physiochemical properties of the materials were characterized by XRD, IR, TG-DSC, TEM, and HRTEM techniques. The results indicated that the crystallization temperature of the materials shifted to higher temperature with the increase of Al2O3 and Fe3O4 content. The introduction of Al2O3 and Fe3O4 increased the temperature corresponding to the phase transformation, Fe3O4 also endowed this solid superacid a super-paramagnetic feature. TEM results indicated that the crystal grew along [101] direction of ZrO2(t). The superacid SZA-20-200-800 has a maximum acid strength (H0<-13.8) measured by Hammett indicator method, indicating that it is a stronger acid than concentrated H2SO4 (H0=-11.9).

Key words: Co-precipitation, Solid acid, Superparamagnetism, Tetragonal phase


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