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Effect of Aging Temperature and Fe/Zr on the Structure and Performance of the Solid Superacid Catalyst SO42- /Fe2O3-ZrO2
Chen Tongyun*, Gu Xupeng, Wan Yubao
School of Chemical Engineering & Environment, Anhui University of Technology, Maanshan 243002
Abstract:
The solid superacid SO42-/Fe2O3-ZrO2 as a catalyst was prepared by aging at a low temperature. The samples were characterized by IR and XRD, and used in catalytic esterification of n-butyl alcohol and sebacic acid. IR spectra show that the intensity of the peak at 1070 cm-1 for the samples aged at a low temperature is much stronger than that aged at a normal temperature. XRD demonstrates a metastable tetragonal phase of ZrO2 for the samples aged at a low temperature. The activity of the catalytic esterification for the samples aged at low temperatures is higher than that of other samples by about 30%. It is suggested that the metastable tetragonal phase of ZrO2 is responsible for the stranger acidity and higher activity of the catalytic esterification of SO42-/Fe2O3-ZrO2.
Key words:  Aging at low temperature, Solid superacid, Preparation
FundProject:安徽省教育厅自然科学基金赞助项目(2003kj053
陈化温度和Fe/Zr配比对SO42-/Fe2O3-ZrO2固体超强酸结构与性能的影响
陈同云*, 古绪鹏, 万玉保
安徽工业大学化工与环境学院,马鞍山,243002
摘要:
用低温陈化法制备了SO42-/Fe2O3-ZrO2(简称SFZ)固体超强酸催化剂,用红外光谱(IR)和X光衍射(XRD)对其结构进行了表征,并考察了它对合成癸二酸二正丁酯的催化性能.IR谱显示,低温陈化的SFZ样品在1070 cm-1处吸收峰远强于常温陈化样品.XRD分析则显示,在焙烧温度为650℃、 Fe/Zr为2 ∶ 1时,低温陈化的样品出现了亚稳态的ZrO2四方晶相.该样品在催化酯化反应中使产率达90%以上,高于常温陈化样品的30%.研究结果表明: 在其他条件不变时,低温陈化所出现的亚稳态的ZrO2
关键词:  低温陈化  固体超强酸  制备
DOI:10.1088/1674-0068/16/4/312-316
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