以具有优异磁学特性的锶铁氧体（SrFe12O19）粒子为磁性基体, 负载固体酸制备锶磁性固体酸催化剂S2O8^2-/ZrO2-SrFe12O19。利用XRD、 比表面积测试（BET）、 振动样品磁强计（VSM）、 IR等表征手段, 研究了磁性催化剂的表面性质和催化性能。结果表明： SrFe12O19的掺入提高了介稳的四方晶型t-ZrO2的热稳定性; 固体酸的磁性能较好, 饱和磁化强度（Ms）在30.0 emu·g^-1左右, 矫顽力（Hc）大于3900 G, 有利于磁分离和重复使用; BET表面积为16.0 m2·g^-1, 平均孔径为8.16 nm, 属于介孔磁性材料; 以乌桕油与甲醇的酯交换为探针反应的研究表明, 该固体酸能在较短时间内有效发挥催化作用。
The magnetic solid acid catalyst(S2O8^2-/ZrO2-SrFe12O19) was prepared by strontium ferrites(SrFe12O19) particle carrying with solid acid, which exhibited excellent magnetic properties as a magnetic matrix. The surface properties and catalytic performance of the magnetic catalyst were analyzed by means of XRD, nitrogen adsorption-desorption (BET), vibrating sample magnetometer (VSM), FTIR. The results show that the introduction of SrFe12O19 can increase thermal stability of the metastable tetragonal type t-ZrO2. The saturated magnetization (Ms) is about 30.0 emu·g^-1, and the coercive force is greater than 3900 G, which is good for the magnetic separation and reuse. The specific surface area of solid acid is 16.0 m^2·g^-1 and the average pore size is 8.16 nm, certifying that the solid acid catalyst is a mesoporous magnetic material. The test for transesterification by tallow oil with methanol as probe reaction shows that the solid acid becomes an effective catalyst in a relatively short time.
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