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Phase composition and pore structure of La, Ce, Y and B doped unsupported alumina membranes were investigated by means of X-ray diffraction and N-2 adsorption. The role of La, Ce, Y and B addition in enhancing the thermal stability of alumina membranes is discussed. At temperatures ranging from 800 to 1000 degreesC, La and Y impregnation are more efficient than that of B and Ce to preserve the BET surface area and pore volume. The addition of La can partially stabilize the alumina membranes up to 1200 degreesC by the delay of phase transformation from gamma- to alpha-Al2O3. (C) 2004 Elsevier B.V. All rights reserved.
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