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Superacid Catalyst SO42-/ZrO2-La2O3 Prepared by Ultrasonic Co-precipitation and Low Temperature Aging
Tong-yun Chen,Xiang-feng Chua*,Ke-liang Hu
Author NameAffiliationE-mail
Tong-yun Chen School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan 243002,China  
Xiang-feng Chua* School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan 243002,China xfchu99@ahut.edu.cn 
Ke-liang Hu Center of Structure Analysis, University of Science and Technology of China, Hefei 230026, China  
Abstract:
Sulfated zirconia-lanthana (SO42-/ZrO2-La2O3) precursors were prepared by ultrasonic co- precipitation method and followed by aging at different temperature. The precursors were treated by 0.5 mol/L H2SO4. Samples of SO42-/ZrO2-La2O3nano-crystalline catalysts were obtained by baking the treated precursors at different temperatures. The acidic properties of SO42-/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 ºC) exhibited highly active sites and high catalytic property.
Key words:  Superacid, SO42-/ZrO2-La2O3, Preparation, Ultrasonic
FundProject:
Superacid Catalyst SO42-/ZrO2-La2O3 Prepared by Ultrasonic Co-precipitation and Low Temperature Aging
陈同云,储向峰*,胡克良
摘要:
低温陈化超声波共沉淀法制得SO42-/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SO42-/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 ºC)陈化,650 ºC焙烧4 h得到的固体超强酸表现出较高催化活性.
关键词:  超强酸,SO42-/ZrO2-La2O3,催化剂,超声波,制备
DOI:10.1088/1674-0068/22/03/322-326
分类号: