钛铝复合氧化物载体的制备及其性能研究

摘要

Titamiun-aluminum bi-oxide with different Ti contents was prepared by co-precipitation with inorganic titamium source and aluminum source as raw materials.It was characterized by means of BET,XRF,XRD,TG,TPD,Py-IR,and SEM.The experimental results showed that titamiun-aluminum bi-oxide had high specific surface area and pore volume,and contained only Lewis acid site.The total acid content and the acid intensity of the titamiun-aluminum bi-oxide both decreased with the increasing amount of TiO2 content.Because of Al2O3 in the complex,TiO2 transformation temperature rose and thus its thermal stability improved.%以无机钛源和铝源为原料,采用共沉淀法制备出不同钛含量的钛铝复合氧化物,采用氮气吸附-脱附曲线、X射线荧光光谱(XRF)、X射线衍射(XRD)、热重分析(TG)、氨气程序升温吸脱附(NH3-TPD)、吡啶吸附红外光谱(Py-IR)、扫描电镜(SEM)等方法对其进行表征.结果表明,钛铝复合氧化物具有较大的比表面积和孔容,不同钛含量的钛铝复合氧化物均只有L酸,并且随着钛含量增加酸量逐渐减少、酸强度逐渐降低.二氧化钛中氧化铝的存在,提高了二氧化钛的晶型转变温度,从而提高了二氧化钛的热稳定性.