有机铝-SiO₂型类气凝胶催化剂制备方法及其表征

Preparation and Characterization of Organoaluminium-SiO₂ Aerogel-Like Catalyst

以六水氯化铝为前驱体,硅酸钠为支撑体,间苯三甲酸钠为交联剂,磷酸为催化剂,氨基戊二酸钠为缓冲剂,通过溶胶凝胶法和常压干燥法制备了制备得到高比表面积、低密度的块状有机铝-SiO2型类气凝胶催化剂。通过SU70型扫描电子显微镜、Autosorb-iQ全自动比表面和孔径分布分析仪、FTIR-650S傅里叶变换红外光谱仪等仪器测定了本催化剂的微观结构、孔洞类型以及化学键及其官能团。对比了三氧化二铝与有机铝-SiO2型类气凝胶催化合成二甲醚的催化性能,得出有机铝-SiO2型类气凝胶催化剂可提高5%~7%的甲醇转化率。Taking aluminium chloride hexahydrate as precursor, sodium silicate as carrier, sodium iso- phthalate as cross-linking agent, phosphoric acid as catalyst and sodium aminoglutarate as buffer, bulk organic silicon dioxide aerogel-like catalysts with high specific surface area and low density were prepared by sol-gel method and atmospheric pressure drying method. The microstructures, pore types, chemical bonds and functional groups of the catalysts were determined by SU70 Scanning electron microscope, Autosorb-iQ automatic surface and pore size analyzer and FTIR-650S Fourier transform infrared spectrometer. The catalytic properties of alumina and organoaluminium-silicon dioxide aerogels for the synthesis of dimethyl ether were compared. The results show that the conversion of methanol can be increased by 5%~7% over the organosilicon aerogel catalyst.