Corrosion resistance of ultra-high purity porous alumina ceramic support

• A ultra-high purity ceramic support has been prepared from boehmite-coated alumina.
• The support has high open porosity, permeability and narrow pore size distribution.
• The support has durable flexural strength and excellent corrosion resistance.
• The good corrosion resistance of the supports mainly benefit from the high purity.

An ultra-high purity porous alumina ceramic support was prepared by boehmite-coated alumina powders at a relatively low temperature. Its corrosion resistance in 20 wt% H2SO4 and 10 wt% NaOH hot solutions for 2 to 8 h was investigated. After corrosion in H2SO4 solution for 8 h, the mass loss was only 0.55%, the flexural strength decreased by 9.85% and the open porosity increased from 41.14% to 47.25%. Meanwhile, the average pore diameter increased from 1.22 μm to 1.60 μm. While in NaOH solution for 8 h, the mass of the support and the flexural strength were diminished by 0.48% and 8.08%, the open porosity and the average pore size were increased to 46.48% and 1.49 μm. The permeability increases from 7.18×10−10 m2 to 1.35×10−9 m2 and 1.25×10−9 m2, respectively, after acidic and alkaline corrosion for 8 h. The support shows an excellent corrosion resistance.

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