磁载钛硅分子筛的制备与表征

Preparation and Characterization of Magnetic Titanium Silicalite Molecular Sieve

将水热合成与溶剂蒸发法相结合,以尖晶石结构的纳米铁酸镍为磁核,成功制备了磁载钛硅分子筛.采用傅里叶变换红外光谱仪(FTIR)、振动样品磁强计(VSM)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和X射线衍射仪(XRD)等对样品进行了表征.结果表明,所制备的磁载钛硅分子筛颗粒呈球形,分布均匀,颗粒直径约为100～150 nm,具有明显核/壳结构和超顺磁特征.磁载钛硅分子筛在环己酮氨肟化反应中表现出良好的催化活性,环己酮转化率达到98%,产物选择性在97%以上.

Magnetic titanium silicalite molecular sieve （NiFe2O4/TS-1） particles with a core/shell structure were prepared via the process of hydrothermal synthesis and solvent vaporation method using nanosized nickelferrite with spinel structure as nuclear. The samples were characterized with Fourier transform infrared spectroscope （FTIR） , vibrating sample magnetometer （ VSM ） scanning electron microscope （ SEM ） , transmission electron microscope（TEM） and X-ray diffractometer（XRD）. The results show that the composite particles are sphere and have an even distribution, with an average size of about 100-150 nm in diameter. The activity of the composite particles was investigated for catalysis of cyclohexanone ammoximation, the experimental results show that the conversion of cyclohexanone can reach up to 98% and the selectivity of the product is higher than 97 %.