【摘要】 以四氯化锡、硫酸铝为原料,氨水为沉淀剂,采用共沉淀法制得新型固体超强酸SO42-/SnO2-A l2O3。采用FT-IR技术考察了金属元素摩尔比、焙烧温度、浸渍液以及掺杂稀土氧化物对该固体超强酸结构和性能的影响。FT-IR结果表明在该固体超强酸中,锡和硫酸根是以螯合和桥式两种方式配位结合,其中起催化活化作用的主要是和硫酸根以螯合双齿结合的锡;和SO42-/ZrO2型超强酸相比,SO42-/SnO2-A l2O3超强酸的硫酸根FT-IR特征吸收峰发生蓝移,显示出更强的酸性。锡铝摩尔比为9∶1、焙烧温度为773K、焙烧时间为3h时,制得的SO42-/SnO2-A l2O3样品对酯化反应的催化性能最好。更多还原

【Abstract】 New solid superacids SO^2-₄/SnO₂-Al₂O₃were prepared by coprecipitation method.The effects of metal ratio,calcination temperature and soakage liquids on the superacids structure and performance were also probed by FT-IR.The FT-IR results showed that in these new solid superacids SO^2-₄/SnO₂-Al₂O₃,the SO^2-₄ is combined with Sn atom by chelate and bridge bonds,in which the SO^2-₄combined by chelate bonds is the main catalytic center.Compared with the FT-IR adsorption peak of SO^2-₄/ZrO₂,the peak of SO^2-₄/SnO₂-Al₂O₃ shows blue-shift,which means the higher super acidity than that of SO^2-₄/ZrO₂.When the metal mole ratio is 9∶1,calcinations temperature is 773K and the calcinations time is 3h,the solid superacids SO^2-₄/SnO₂-Al₂O₃ shows the best catalysis for esterification.更多还原