Superacid Catalyst SO42-/ZrO2-La2O3 Prepared by Ultrasonic Co-precipitation and Low Temperature Aging
- Received Date: 2009-04-13
Abstract: Sulfated zirconia-lanthana (SO42-/ZrO2-La2O3) precursors were prepared by ultrasonic co-precipitation method and followed by aging at different temperature. The precursors weretreated by 0.5 mol/L H2SO4. Samples of SO42-/ZrO2-La2O3nano-crystalline catalysts wereobtained by baking the treated precursors at different temperatures. The acidic properties ofSO42-/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.
|Citation:||Tong-yun Chen, Xiang-feng Chua, Ke-liang Hu. Superacid Catalyst SO42-/ZrO2-La2O3 Prepared by Ultrasonic Co-precipitation and Low Temperature Aging[J]. Chinese Journal of Chemical Physics , 2009, 22(3): 322-326. doi: 10.1088/1674-0068/22/03/322-326|