脉冲电磁场作用下Ce改性γ-Al2O3载体的热稳定性

摘要

Ce modified #-Al2 O3 support samples were prepared by sol-gel method with and without the presence of a pulse electromagnetic field (PEMF),respectively. The physical properties and thermal stabilities of the samples at different pulse voltage were characterized by N2 physisorption,scanning e-lectron microscope,IR spectroscopy and X-ray diffraction techniques. Results show that the specific pore volume and specific surface area of Ce modified #-Al2 O3 sample at 300 V increase by 19. 50% and 18. 45%,respectively,compared with sample without PEMF treatment. Moreover,the amount of hy-droxyl group covered on the surface of #-Al2 O3 increases resulting from evenly dispersed CeO2 and the high temperature thermal stability of samples with PEMF treatment is improved accordingly.%采用溶胶凝胶法和脉冲电磁场辅助溶胶凝胶法制备了 Ce 改性#-Al2 O3载体，利用 BET，SEM， FTIR，XRD等方法对所制备的样品进行了表征。考察了脉冲电磁场电压强度对Ce 改性#-Al2 O3载体样品的物理性能以及高温热稳定性的影响。结果表明，脉冲电压为300 V时，Ce改性#-Al2 O3载体具有较高的比表面积、较大的孔体积和平均孔径，Ce在载体表面的分散较好，颗粒较细，而且载体表面的羟基覆盖量大，具有较强的高温热稳定性。