催化精馏专用填料型固体酸SO42-/ZrO2-Al2O3-Al的研究

为了研制催化精馏专用催化剂,采用铝阳极氧化法制备了Al2O3-Al一体型载体,并将活性固体超强酸SO42-/ZrO2引入到Al2O3-Al上,得到一种新型催化精馏专用填料式固体酸SO42-/ZrO2-Al2O3-Al催化剂.利用XRD、 SEM、 BET、 XPS、 NH3-TPD等手段对其进行了表征.结果表明,所制得的阳极氧化铝膜厚为56 μm, SO42-/ZrO2-Al2O3-Al固体酸具有比表面积大、酸强度适中的特点.XRD结果表明, ZrO2在Al2O3-Al上处于高度分散状态.将该固体酸用于乙酸/乙醇酯化反应中,显示出较高的催化活性,且稳定性较好.

Study on Structure SO42-/ZrO2-Al2 O3-Al Solid Acid for Catalytic Distillation

The catalytic distillation seems to be an energy-saving process with lower investment and operating costs in comparison to the traditional processes. As an alternative to existing catalytic distillation catalysts, containing bales or pockets of catalysts stacked in the distillation column, a novel structural catalystwas proposed. The novel structural solid acid catalyst for the catalytic distillation was prepared by supporting SO42-/ZrO2onto a thin alumina film that had been formed by anodic oxidation of high-purity aluminium foils. The samples were characterized by XRD, SEM, BET, XPS and NH3-TPDmethods. The results showed thatthe thickness of the anodized alumina filmwasmeasured as approximately 56μm by SEM, and the SO42-/ZrO2-Al2O3-Al catalyst had large specific surface area and moderate acid sites. The XRD results showed that ZrO2was utterly dispersed on Al2O3-Al. The catalyst was active for the esterification of acetic acid with ethanol, and could be reused directly for 5 times which meant the catalyst had good stability.