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Abstract
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In this study supported meso-porous gamma-alumina membrane with a thickness of 2.5µm was synthesized on a macro-porous alpha-alumina substrate via colloidal sol-gel route. To evaluate the improvement in the thermal stability of alumina by yttria addition, unsupported alumina membranes with various amounts of yttria (0, 2.5, 5 and 10%mol) were investigated by XRD and TG-DTA analyses. Based on XRD results and considering transitional alumina stabilization effect, the optimum concentration of yttria was determined to be 5%mol. The results of DTA analysis showed that 5%mol yttria addition shifted the gamma to alpha phase transformation to higher temperatures.
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