【摘要】 以硝酸锆为锆源、硝酸铝为铝源,采用共沉淀法制备了A l2O3-ZrO2复合载体,通过MoO3改性和H2SO4浸渍法制备了MoO3改性的SO42-/A l2O3-ZrO2催化剂。用XRD和FT-IR对催化剂进行表征,用元素分析仪测定硫含量,用乙酸和正丁醇的酯化反应对其催化活性进行考察。结果发现,当MoO3添加质量分数达12.0%时,出现MoO3衍射峰,表明适当的MoO3可以单层分布在催化剂表面,从而稳定SO42-的存在。FT-IR分析结果表明,催化剂具有固体酸的特征峰。在MoO3添加质量分数为8.0%和焙烧温度650℃时,催化剂的催化活性达最大值,催化活性与硫含量的增加不一致。更多还原

【Abstract】 MoO3-modified SO2-4/Al2O3-ZrO2 were prepared by co-precipitation and impregnation method,using zirconium nitrate and aluminum nitride as the zirconium and aluminum source.The catalysts were characterized by element analysis,FT-IR and XRD.The activity of SO2-4/Al2O3-ZrO2 was investigated for esterification of acetic acid and n-butanol. XRD results indicated that there were MoO3 diffraction peaks when content of MoO3 exceeded 12.0%(mass fraction),which meant that appropriate amount of MoO3 results in single layer dispersion on the surface and hence stabilized sulfate.FT-IRresulted showed that there were typical characteristic adsorption peaks for solid superacid in the catalysts.Appropriate amount of sulfur were enhanced the catalytic activity.Optimum catalytic activity was attained when adding 8.0%(mass fraction) MoO3 and calcined at 650 ℃.更多还原