| 低温陈化超声波共沉淀制备SO4^2-/ZrO2-La2O3催化剂 |
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| 引用本文： | 陈同云,;储向峰,;胡克良.低温陈化超声波共沉淀制备SO4^2-/ZrO2-La2O3催化剂[J].化学物理学报(中文版),2009(3):322-326. |
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| 作者姓名： | 陈同云 ;储向峰 ;胡克良 |
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| 作者单位： | [1]安徽工业大学化学与化工学院,马鞍山243002; [2]中国科学技术大学结构分析中心,合肥230026 |
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| 摘 要： | 低温陈化超声波共沉淀法制得SO4^2-/ZrO2-La2O3前驱体，经H2SO4处理，在不同温度下焙烧得到纳米晶催化剂SO4^2-/ZrO2-La2O3；用Hammett指示剂法测定其酸性．用XRD、BET、TEM、IR和XPS对样品进行表征，其催化活性用醋酸和甘油的酯化反应进行了评价．结果表明经超声波搅拌和低温（-15℃）陈化，650℃焙烧4h得到的固体超强酸表现出较高催化活性．
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| 关 键 词： | 超强酸 SO4^2-/ZrO2-La2O3 催化剂 超声波 制备 |
Superacid Catalyst SO4^2-/ZrO2-La2O3 Prepared by Ultrasonic Co-precipitation and Low Temperature Aging |
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| Institution: | Tong-yun Chen, Xiang-feng Chu, Ke-liang Hu(a. School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan 243002 China b. Center of Structure Analysis, University of Science and Technology of China, Hefei 230026, China) |
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| Abstract: | Sulfated zirconia-lanthana （SO4^2-/ZrO2-La2O3） precursors were prepared by ultrasonic coprecipitation method and followed by aging at different temperature. The precursors were treated by 0.5 mol/L H2SO4. Samples of SO4^2-/ZrO2-La2O3 nano-crystalline catalysts were obtained by baking the treated precursors at different temperatures. The acidic properties of SO4^2-/ZrO2-La2O3 were tested by the Hammett indicator method. The phase composition, specific area, particle structure, and surface state were characterized by X-ray diffraction, BET, transmission electron microscopy, infrared spectrum, and X-ray photoelectron spec- troscopy. The catalytic activities were estimated by esterification of acetic acid with glycerin. It was shown that the catalyst prepared by ultrasonic stirring and low temperature （-15 ℃） exhibited highly active sites and high catalytic property. |
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| Keywords: | Superacid SO4^2-/ZrO2-La2O3 Preparation Ultrasonic |
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