不同稀土改性SO_4^(2-)/ZrO_2催化剂的结构与性能表征

Structure and Catalytic Properties of SO_4^(2-)/ZrO_2 Catalyst Modified by Different Rare Earth Compounds

在硫酸促进氧化物型固体超强酸催化剂中．SO4^2-／ZrO2类催化剂是颇受关注的新型环保催化材料，其在某些有机催化反应（如酯化、酰化、烷基化、异构化等）中表现出较高的活性。尽管该类催化剂具有许多优点，但是要真正用于工业生产实际，仍然有许多的问题有待解决。因此，以解决这类催化剂存在的问题为目标的改性研究工作十分活跃．其中稀土改性SO4^2-/ZrO2催化剂也是现今发展的趋势。

Solid superacid catalyst SO4^2-/ZRO2 was modified by different rare earth compounds and applied to the esterification of acetic acid and n-butanol. The effects of rare earth elements loading on the catalytic properties were studied and the correlation between the structure and properties was investigated by means of XRD, IR, UV, DTA and TG. The results show that the （NH4）2Ce（NO3）6 modification can enhance catalytic activity more and exhibit better stability than the other two compounds La（NO3）3 and Ce（NO3）3. Meanwhile,（NH4）2Ce（NO3）6 modification can restrain the loss of SO4^2- efficiently. The optimum calcination temperature and molar ratio of Ce（NH）：Zr for SO4^2-/ZrO2catalyst modified by （NH4）2Ce（NO3）6 are 450 ℃ and 2, respectively.