锶磁性固体酸S_2O_8^(2-)/ZrO_2-SrFe_(12)O_(19)催化剂的制备和表征  

Synthesis and characterization of S_2O_8^(2-)/ZrO_2-SrFe_(12)O_(19) strontium magnetic solid acid catalyst

作　　者：谢太平[1] 刘成伦[2] 徐龙君 谢昭明[2] 

机构地区：[1]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400030 [2]重庆大学化学化工学院,重庆400030

出　　处：《复合材料学报》2012年第5期121-126,共6页Acta Materiae Compositae Sinica

基　　金：重庆市科技攻关计划项目(CSTC;2011AC4070)

摘　　要：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S2O28-/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30.0emu.g-1左右,矫顽力(Hc)大于3900G,有利于磁分离和重复使用;BET表面积为16.0m2.g-1,平均孔径为8.16nm,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.

关 键 词：锶铁氧体 固体酸 磁性催化材料 乌桕油 酯交换 

分 类 号：TB332[一般工业技术—材料科学与工程] TQ127[化学工程—无机化工]