Corrosion resistance of ultra-high purity porous alumina ceramic support

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 mu m to 1.60 mu m. 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 mu m. The permeability increases from 7.18 x 10(-10) m(2) to 1.35 x 10(-9) m(2) and 1.25 x 10(-9) m(2), respectively, after acidic and alkaline corrosion for 8 h. The support shows an excellent corrosion resistance. (C) 2015 Elsevier B.V. All rights reserved.